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Measurement of inclusive and differential Higgs boson production cross sections in the diphoton decay channel in proton-proton collisions at √s = 13 TeV

arXiv

引用

arXiv 2018年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Asilar, E. Bergauer, T. Brandstetter, J. Brondolin, E. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Ghete, V.M. Hrubec, J. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Rohringer, H. Schieck, J. Schöfbeck, R. Spanring, M. Spitzbart, D. Taurok, A. Waltenberger, W. Wittmann, J. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Mossolov, V. Suarez Gonzalez, J. De Wolf, E.A. D., Di Croce X., Janssen J., Lauwers M., Pieters M., Van De Klundert H., Van Haevermaet P., Van Mechelen N., Van Remortel S., Abu Zeid F., Blekman J., D'Hondt I., De Bruyn J., De Clercq K., Deroover G., Flouris D., Lontkovskyi S., Lowette I., Marchesini S., Moortgat L., Moreels q., python K., Skovpen S., Tavernier W., Van Doninck P., Van Mulders I., Van Parijs D., Beghin B., Bilin H., Brun B., Clerbaux G., De Lentdecker H., Delannoy B., Dorney G., Fasanella L., Favart R., Goldouzian A., Grebenyuk A.K., Kalsi T., Lenzi J., Luetic N., Postiau E., Starling L., Thomas C., Vander Velde P., Vanlaer D., Vannerom q., Wang T., Cornelis D., Dobur A., Fagot M., Gul I., Khvastunov D., Poyraz C., Roskas D., Trocino M., Tytgat W., Verbeke B., Vermassen M., Vit N., Zaganidis H., Bakhshiansohi O., Bondu S., Brochet G., Bruno C., Caputo P., David C., Delaere M., Delcourt B., Francois A., Giammanco G., Krintiras V., Lemaitre A., Magitteri A., Mertens M., Musich K., Piotrzkowski A., Saggio M., Vidal Marono S., Wertz J., Zobec F.L., Alves G.A., Alves L., Brito G., Correia Silva C., Hensel A., Moraes M.E., Pol P., Rebello Teles E., Belchior Batista Das Chagas W., Carvalho J., Chinellato E., Coelho E.M., Da Costa G.G., Da Silveira D., De Jesus Damiao C., De Oliveira Martins S., Fonseca De Souza H., Malbouisson D., Matos Figueiredo M., Melo De Almeida C., Mora Herrera L., Mundim H., Nogima W.L., Prado Da Silva L.J., Sanchez Rosas A., Santoro A., Sznajder M., Thiel E.J., Tonelli Manganote F., Torres Da Silva De Araujo A., Vilela Pereira S., Ahuja C.A., Bernardes L., Calli Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Tsinghua University Beijing China Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole polytechnique CNRS/IN2P3 Université Paris-Saclay Palaiseau France Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France Centre de Calcul de l'Institut National de Physique Nucl

Measurements of the inclusive and differential production cross sections for the Higgs boson in the diphoton decay channel are performed using the data set of proton-proton collisions at √s = 13 TeV collected by the CMS experiment at the LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb−1. The cross sections are measured in a fiducial phase space defined by a set of requirements on the isolation and kinematic variables of the photons. Differential cross sections are measured as functions of the kinematic properties of the diphoton system and the event. A subset of the measurements is performed in regions of the fiducial phase space, where relative contributions of specific Higgs boson production mechanisms are enhanced. The total cross section in the chosen fiducial phase space is measured to be 84 ± 11 (stat) ± 7 (syst) fb = 84 ± 13 fb, to be compared with a theoretical prediction of 73 ± 4 fb. All measurements are found to be in agreement with the theoretical predictions for the standard model Higgs boson with a mass of 125.09 GeV within the experimental and theoretical uncertainties. Copyright © 2018, The Authors. All rights reserved.

关键词： Bosons

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Measurement of quark- and gluon-like jet fractions using jet charge in PbPb and pp collisions at 5.02 TeV

arXiv

引用

arXiv 2020年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Ero, J. Escalante Del Valle, A. Flechl, M. Fruhwirth, R. Jeitler, M. Krammer, N. Kratschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schofbeck, R. Spanring, M. Waltenberger, W. Wulz, C.-E. Zarucki, M. Drugakov, V. Mossolov, V. Suarez Gonzalez, J. Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Lelek, A. Pieters, M. Rejeb Sfar, H. Van Haevermaet, H. Van Mechelen, P. Van Putte, S. Van Remortel, N. Blekman, F. Bols, E.S. Chhibra, S.S. D'Hondt, J. De Clercq, J. Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. python, q. Tavernier, S. Van Doninck, W. Van Mulders, P. Beghin, D. Bilin, B. Clerbaux, B. De Lentdecker, G. Delannoy, H. Dorney, B. Favart, L. Grebenyuk, A. Kalsi, A.K. Moureaux, L. Popov, A. Postiau, N. Starling, E. Thomas, L. Vander Velde, C. Vanlaer, P. Vannerom, D. Cornelis, T. Dobur, D. Khvastunov, I. Niedziela, M. Roskas, C. Skovpen, K. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Bondu, O. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Giammanco, A. Lemaitre, V. Prisciandaro, J. Saggio, A. Vidal Marono, M. Vischia, P. Zobec, J. Alves, G.A. Correia Silva, G. Hensel, C. Moraes, A. Belchior Batista Das Chagas, E. Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. Fonseca De Souza, S. Malbouisson, H. Martins, J. Matos Figueiredo, D. Medina Jaime, M. Melo De Almeida, M. Mora Herrera, C. Mundim, L. Nogima, H. Prado Da Silva, W.L. Rebello Teles, P. Sanchez Rosas, L.J. Santoro, A. Sznajder, A. Thiel, M. Tonelli Manganote, E.J. Torres Da Silva De Araujo, F. Vilela Pereira, A. Fang, W. Gao, X. Yuan, L. Ahmad, M. Hu, Z. Wang, Y. Chen, G.M. Chen, H.S. Chen, M. Jiang, C.H. Leggat, D. Liao, H. Liu, Z. Spiezia, A. Tao, J. Yazgan, E. Zhang, H. Zhang, S. Zhao, J. Agapitos, A. Ban, Y. Chen, G. Levin, A. Li, J. Li, L. Li, q. Mao, Y. qian, S.J. Wang, D. Wang, q. Besancon, M. Couderc, F. Dejardin, M. Denegri, D. Fabbro, B. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade Do Estado Do Rio de Janeiro Rio de Janeiro Brazil Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Irfu Cea Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Université de Strasbourg Cnrs Iphc Umr 7178 Strasbourg France Deutsches Elektronen-Synchrotron Hamburg Germany University of Hamburg Hamburg Germany Karlsruher Institut fuer Technologie Karlsruhe Germany P.N. Lebedev Physical Institute Moscow Russia Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University Moscow Russia Novosibirsk Russia Institute for High Energy Physics of National Research Centre Kurchatov Institute Protvino Russia National Research Tomsk Polytechnic University Tomsk Russia Tomsk State University Tomsk Russia University of Belgrade Faculty of Physics Vinca Institute of Nuclear Sciences Cern European Organization for Nuclear Research Geneva Switzerland Paul Scherrer Institut Villigen Switzerland Zurich Switzerland Rutherford Appleton Laboratory Didcot United Kingdom Imperial College London United Kingdom Brown University Providence United States University of California Davis Davis United States University of California Los Angeles United States University of California Riverside Riverside United States University of California San Diego San Diego United States

The momentum-weighted sum of the electric charges of particles inside a jet, known as jet charge, is sensitive to the electric charge of the particle initiating the parton shower. This paper presents jet charge distributions in √sNN= 5.02 TeV lead-lead (PbPb) and proton-proton (pp) collisions recorded with the CMS detector at the LHC. These data correspond to integrated luminosities of 404 μb-1and 27.4 pb-1for PbPb and pp collisions, respectively. Leveraging the sensitivity of the jet charge to fundamental differences in the electric charges of quarks and gluons, the jet charge distributions from simulated events are used as templates to extract the quark- and gluon-like jet fractions from data. The modification of these jet fractions is examined by comparing pp and PbPb data as a function of the overlap of the colliding Pb nuclei (centrality). This measurement tests the color charge dependence of jet energy loss due to interactions with the quark-gluon plasma. No significant modification between different centrality classes and with respect to pp results is observed in the extracted fractions of quark- and gluon-like jet fractions. Copyright © 2020, The Authors. All rights reserved.

关键词： Elementary particles

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Search for supersymmetry with a compressed mass spectrum in events with a soft τ lepton, a highly energetic jet, and large missing transverse momentum in proton-proton collisions at √s = 13 TeV

arXiv

引用

arXiv 2019年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Brandstetter, J. Dragicevic, M. Ero, J. Escalante Del Valle, A. Flechl, M. Fruhwirth, R. Jeitler, M. Krammer, N. Kratschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schofbeck, R. Spanring, M. Spitzbart, D. Waltenberger, W. Wulz, C.-E. Zarucki, M. Drugakov, V. Mossolov, V. Suarez Gonzalez, J. Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Lelek, A. Pieters, M. Rejeb Sfar, H. Van Haevermaet, H. Van Mechelen, P. Van Putte, S. Van Remortel, N. Blekman, F. Bols, E.S. Chhibra, S.S. D'Hondt, J. De Clercq, J. Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. python, q. Skovpen, K. Tavernier, S. Van Doninck, W. Van Mulders, P. Beghin, D. Bilin, B. Brun, H. Clerbaux, B. De Lentdecker, G. Delannoy, H. Dorney, B. Favart, L. Grebenyuk, A. Kalsi, A.K. Popov, A. Postiau, N. Starling, E. Thomas, L. Vander Velde, C. Vanlaer, P. Vannerom, D. Cornelis, T. Dobur, D. Khvastunov, I. Niedziela, M. Roskas, C. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Bondu, O. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Giammanco, A. Lemaitre, V. Prisciandaro, J. Saggio, A. Vidal Marono, M. Vischia, P. Zobec, J. Alves, F.L. Alves, G.A. Correia Silva, G. Hensel, C. Moraes, A. Rebello Teles, P. Belchior Batista Das Chagas, E. Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. Fonseca De Souza, S. Huertas Guativa, L.M. Malbouisson, H. Martins, J. Matos Figueiredo, D. Medina Jaime, M. Melo De Almeida, M. Mora Herrera, C. Mundim, L. Nogima, H. Prado Da Silva, W.L. Sanchez Rosas, L.J. Santoro, A. Sznajder, A. Thiel, M. Tonelli Manganote, E.J. Torres Da Silva De Araujo, F. Vilela Pereira, A. Chen, G.M. Chen, H.S. Chen, M. Jiang, C.H. Leggat, D. Liao, H. Liu, Z. Spiezia, A. Tao, J. Yazgan, E. Zhang, H. Zhang, S. Zhao, J. Agapitos, A. Ban, Y. Chen, G. Levin, A. Li, J. Li, L. Li, q. Mao, Y. qian, S.J. Wang, D. Wang, q. Ahmad, M. Hu, Z. Wang, Y. Xiao, M. Avila, C. Cabrera, A. Florez, C. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade Do Estado Do Rio de Janeiro Rio de Janeiro Brazil Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Tsinghua University Beijing China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS/IN2P3 Université Paris-Saclay Palaiseau France Université de Strasbourg Cnrs Iphc Umr 7178 Strasbourg France Deutsches Elektronen-Synchrotron Hamburg Germany University of Hamburg Hamburg Germany Karlsruher Institut fuer Technologie Karlsruhe Germany Madrid Spain Cern European Organization for Nuclear Research Geneva Switzerland Paul Scherrer Institut Villigen Switzerland Zurich Switzerland Universität Zürich Zurich Switzerland Brown University Providence United States University of California Davis Davis United States University of California Los Angeles United States University of California Riverside Riverside United States University of Florida Gainesville United States Texas Tech University Lubbock United States Vanderbilt University Nashville United States University of Virginia Charlottesville United States Wayne State University Detroit United States University of Wisconsin - Madison MadisonWI United States

The first search for supersymmetry in events with an experimental signature of one soft, hadronically decaying τ lepton, one energetic jet from initial-state radiation, and large transverse momentum imbalance is presented. These event signatures are consistent with direct or indirect production of scalar τ leptons (τ) in supersymmetric models that exhibit coannihilation between the τ and the lightest neutralino (Χ01), and that could generate the observed relic density of dark matter. The data correspond to an integrated luminosity of 77.2 fb-1of proton-proton collisions at √s = 13 TeV collected with the CMS detector at the LHC in 2016 and 2017. The results are interpreted in a supersymmetric scenario with a small mass difference (Δm) between the chargino (Χ±1) or next-to-lightest neutralino (Χ02), and the Χ01. The mass of the τ is assumed to be the average of the Χ±1and Χ01masses. The data are consistent with standard model background predictions. Upper limits at 95% confidence level are set on the sum of the Χ±1, Χ02, and Τ production cross sections for Δm(Χ±1, Χ01) = 50 GeV, resulting in a lower limit of 290 GeV on the mass of the Χ±1, which is the most stringent to date and surpasses the bounds from the LEP experiments. Copyright © 2019, The Authors. All rights reserved.

关键词： Mass spectrometry

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Measurements of ttH production and the CP structure of the Yukawa interaction between the Higgs boson and top quark in the diphoton decay channel

arXiv

引用

arXiv 2020年

作者： Sirunyany, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Del Valle, A. Escalante Flechl, M. Uhwirth, R.F. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schöfbeck, R. Spanring, M. Waltenberger, W. Wulz, C.-E. Zarucki, M. Drugakov, V. Mossolov, V. Gonzalez, J. Suarez Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Kello, T. Lelek, A. Pieters, M. Sfar, H. Rejeb Van Haevermaet, H.V. Van Mechelen, P. Van Putte, S. Van Remortel, N. Abu Zeid, S.A. Blekman, F. Bols, E.S. Chhibra, S.S. D'Hondt, J. Clercq, J. De Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. python, q. Tavernier, S. Van Doninck, W. Van Mulders, P. Van Parijs, I. Beghin, D. Bilin, B. Clerbaux, B. Lentdecker, G. De Delannoy, H. Dorney, B. Favart, L. Kalsi, A.K. Moureaux, L. Popov, A. Postiau, N. Starling, E. Thomas, L. Velde, C. Vander Vanlaer, P. Vannerom, D. Wang, q. Cornelis, T. Dobur, D. Khvastunov, I. Niedziela, M. Roskas, C. Skovpen, K. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Giammanco, A. Lemaitre, V. Prisciandaro, J. Saggio, A. Vischia, P. Zobec, J. Alves, G.A. Silva, G. Correia Hensel, C. Moraes, A. Chagas, E. Belchior Batista Das Carvalho, W. Chinellato, J. Coelho, E. Costa, E.M. Da Silveira, G.G. Da Damiao, D. De Jesus Martins, C. De Oliveira Souza, S. Fonseca De Malbouisson, H. Martins, J. Figueiredo, D. Matos Jaime, M. Medina Almeida, M. Melo De Herrera, C. Mora Mundim, L. Nogima, H. Silva, W.L. Prado Da Teles, P. Rebello Rosas, L.J. Sanchez Santoro, A. Sznajder, A. Thiel, M. Manganote, E.J. Tonelli Araujo, F. Torres Da Silva De Pereira, A. Vilela Bernardesa, C.A. Calligarisa, L. Tomeia, T.R. Fernandez Perez Gregoresb, E.M. Lemos, D.S. Mercadanteb, P.G. Novaesa, S.F. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Rodozov, M. Yerevan Physics Institute Yerevan Armenia Institut F Ur Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Saõ Paulo Brazil Universidade Federal do ABC Saõ Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia Faculty of Electrical Engineering University of Split Mechanical Engineering and Naval Architecture Split Croatia Faculty of Science University of Split Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Institut Polytechnique de Paris CNRS/IN2P3 Ecole Polytechnique Université de Strasbourg CNRS IPHC UM

The first observation of thett H process in a single Higgs boson decay channel with the full reconstruction of the final state (H→γγ) is presented, with a significance of 6.6 standard deviations (σ). The CP structure of Higgs boson couplings to fermions is measured, resulting in an exclusion of the pure CP-odd structure of the top Yukawa coupling at 3.2σ. The measurements are based on a sample of proton-proton collisions at a center-of-mass energys√=13 TeV collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb-1. The cross section times branching fraction of thett H process is measured to beσtt HBγγ=1.56+0.34-0.32fb, which is compatible with the standard model prediction of 1.13+0.08-0.11fb. The fractional contribution of the CP-odd component is measured to befHttCP=0.00±0.33. Copyright © 2020, The Authors. All rights reserved.

关键词： Bosons

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Search for black holes and sphalerons in high-multiplicity final states in proton-proton collisions at √s = 13 TeV†

arXiv

引用

arXiv 2018年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Asilar, E. Bergauer, T. Brandstetter, J. Brondolin, E. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Ghete, V.M. Hrubec, J. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Rohringer, H. Schieck, J. Schöfbeck, R. Spanring, M. Spitzbart, D. Taurok, A. Waltenberger, W. Wittmann, J. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Mossolov, V. Suarez Gonzalez, J. De Wolf, E.A. Di Croce, D. Janssen, X. Lauwers, J. Pieters, M. Van De Klundert, M. Van Haevermaet, H. Van Mechelen, P. Van Remortel, N. Abu Zeid, S. Blekman, F. D'Hondt, J. De Bruyn, I. De Clercq, J. Deroover, K. Flouris, G. Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. Moreels, L. python, q. Skovpen, K. Tavernier, S. Van Doninck, W. Van Mulders, P. Van Parijs, I. Beghin, D. Bilin, B. Brun, H. Clerbaux, B. De Lentdecker, G. Delannoy, H. Dorney, B. Fasanella, G. Favart, L. Goldouzian, R. Grebenyuk, A. Kalsi, A.K. Lenzi, T. Luetic, J. Postiau, N. Starling, E. Thomas, L. Vander Velde, C. Vanlaer, P. Vannerom, D. Wang, q. Cornelis, T. Dobur, D. Fagot, A. Gul, M. Khvastunov, I. Poyraz, D. Roskas, C. Trocino, D. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Zaganidis, N. Bakhshiansohi, H. Bondu, O. Brochet, S. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Francois, B. Giammanco, A. Krintiras, G. Lemaitre, V. Magitteri, A. Mertens, A. Musich, M. Piotrzkowski, K. Saggio, A. Vidal Marono, M. Wertz, S. Zobec, J. Alves, F.L. Alves, G.A. Brito, L. Correia Silva, G. Hensel, C. Moraes, A. Pol, M.E. Rebello Teles, P. Belchior Batista Das Chagas, E. Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. Fonseca De Souza, S. Malbouisson, H. Matos Figueiredo, D. Melo De Almeida, M. Mora Herrera, C. Mundim, L. Nogima, H. Prado Da Silva, W.L. Sanchez Rosas, L.J. Santoro, A. Sznajder, A. Thiel, M. Tonelli Manganote, E.J. Torres Da Silva De Araujo, F. Vilela Pereira, A. Ahuja, S. Bernardes, C.A. Calligari Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Tsinghua University Beijing China Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole polytechnique CNRS/IN2P3 Université Paris-Saclay Palaiseau France Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France Centre de Calcul de l'Institut National de Physique Nucl

A search in energetic, high-multiplicity final states for evidence of physics beyond the standard model, such as black holes, string balls, and electroweak sphalerons, is presented. The data sample corresponds to an integrated luminosity of 35.9 fb−1 collected with the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV in 2016. Standard model backgrounds, dominated by multijet production, are determined from control regions in data without any reliance on simulation. No evidence for excesses above the predicted background is observed. Model-independent 95% confidence level upper limits on the cross section of beyond the standard model signals in these final states are set and further interpreted in terms of limits on semiclassical black hole, string ball, and sphaleron production. In the context of models with large extra dimensions, semiclassical black holes with minimum masses as high as 10.1 TeV and string balls with masses as high as 9.5 TeV are excluded by this search. Results of the first dedicated search for electroweak sphalerons are presented. An upper limit of 0.021 is set at 95% confidence level on the fraction of all quark-quark interactions above the nominal threshold energy of 9 TeV resulting in the sphaleron transition. Copyright © 2018, The Authors. All rights reserved.

关键词： Stars

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Experimental study of different silicon sensor options for the upgrade of the CMS outer tracker

arXiv

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arXiv 2020年

作者： Adam, W. Bergauer, T. Blöch, D. Brondolin, E. Dragicevic, M. Frühwirth, R. Hinger, V. Steininger, H. Treberer-Treberspurg, W. Beaumont, W. Di Croce, D. Janssen, X. Lauwers, J. van Mechelen, P. van Remortel, N. Blekman, F. Chhibra, S.S. de Clercq, J. D’Hondt, J. Lowette, S. Marchesini, I. Moortgat, S. python, q. Skovpen, K. Sørensen Bols, E. van Mulders, P. Allard, Y. Beghin, D. Bilin, B. Brun, H. Clerbaux, B. de Lentdecker, G. Delannoy, H. Deng, W. Favart, L. Goldouzian, R. Grebenyuk, A. Kalsi, A. Makarenko, I. Moureaux, L. Popov, A. Postiau, N. Robert, F. Song, Z. Thomas, L. Vanlaer, P. Vannerom, D. Wang, q. Wang, H. Yang, Y. Bondu, O. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Giammanco, A. Krintiras, G. Lemaitre, V. Magitteri, A. Piotrzkowski, K. Saggio, A. Szilasi, N. Marono, M. Vidal Vischia, P. Zobec, J. Brigljević, V. Ceci, S. Ferenček, D. Roguljić, M. Starodumov, A. Šuša, T. Eerola, P. Heikkilä, J. Brücken, E. Lampén, T. Luukka, P. Martikainen, L. Tuominen, E. Tuuva, T. Agram, J.-L. Andrea, J. Bloch, D. Bonnin, C. Bourgatte, G. Brom, J.-M. Chabert, E. Charles, L. Dangelser, E. Gelé, D. Goerlach, U. Gross, L. Krauth, M. Tonon, N. Baulieu, G. Boudoul, G. Caponetto, L. Chanon, N. Contardo, D. Dené, P. Dupasquier, T. Galbit, G. Lumb, N. Mirabito, L. Nodari, B. Perries, S. Donckt, M. Vander Viret, S. Autermann, C. Böhm, S. Feld, L. Karpinski, W. Kiesel, M.K. Klein, K. Lipinski, M. Meuser, D. Pauls, A. Pierschel, G. Preuten, M. Rauch, M. Röwert, N. Schulz, J. Teroerde, M. Wehner, J. Wlochal, M. Dziwok, C. Fluegge, G. Müller, T. Pooth, O. Stahl, A. Ziemons, T. Aldaya, M. Asawatangtrakuldee, C. Eckerlin, G. Eckstein, D. Eichhorn, T. Gallo, E. Guthoff, M. Haranko, M. Harb, A. Keaveney, J. Kleinwort, C. Mankel, R. Maser, H. Meyer, M. Missiroli, M. Muhl, C. Mussgiller, A. Pitzl, D. Reichelt, O. Savitskyi, M. Schuetze, P. Stever, R. Walsh, R. Zuber, A. Benecke, A. Biskop, H. Buhmann, P. Institut für Hochenergiephysik Wien Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Institut Ruđer Bošković Zagreb Croatia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland Université de Lyon Université Claude Bernard Lyon 1 CNRS-IN2P3 Institut de Physique Nucléaire de Lyon Villeurbanne France RWTH Aachen University I. Physikalisches Institut Aachen Germany RWTH Aachen University III. Physikalisches Institut B Aachen Germany Deutsches Elektronen-Synchrotron Hamburg Germany University of Hamburg Hamburg Germany Institut für Experimentelle Teilchenphysik KIT Karlsruhe Germany NCSR Demokritos Aghia Paraskevi Greece Wigner Research Centre for Physics Budapest Hungary University of Delhi Delhi India Saha Institute of Nuclear Physics Kolkata India INFN Sezione di Bari Bari Italy Università di Bari Bari Italy Politecnico di Bari Bari Italy INFN Sezione di Catania Catania Italy Università di Catania Catania Italy INFN Sezione di Firenze Firenze Italy Università di Firenze Firenze Italy INFN Sezione di Genova Genova Italy Università di Genova Genova Italy INFN Sezione di Milano-Bicocca Milano Italy Università di Milano-Bicocca Milano Italy INFN Sezione di Padova Padova Italy Università di Padova Padova Italy INFN Sezione di Pavia Bergamo Italy Università di Bergamo Bergamo Italy INFN Sezione di Perugia Perugia Italy Università di Perugia Perugia Italy CNR-IOM Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy Università di Pisa Pisa Italy Scuola Normale Superiore di Pisa Pisa Italy INFN Sezione di Torino Torino Italy Università di Torino Torino Italy Politecnico di Torino Torino Italy Paul Scherrer Institut Villigen Switzerland Institute for Particle Physics E

During the high-luminosity phase of the LHC (HL-LHC), planned to start in 2027, the accelerator is expected to deliver an instantaneous peak luminosity of up to 7.5 × 1034 cm−2s−1. A total integrated luminosity of 3000 or even 4000 fb−1 is foreseen to be delivered to the general purpose detectors ATLAS and CMS over a decade, thereby increasing the discovery potential of the LHC experiments significantly. The CMS detector will undergo a major upgrade for the HL-LHC, with entirely new tracking detectors consisting of an Outer Tracker and Inner Tracker. However, the new tracking system will be exposed to a significantly higher radiation than the current tracker, requiring new radiation-hard sensors. CMS initiated an extensive irradiation and measurement campaign starting in 2009 to systematically compare the properties of different silicon materials and design choices for the Outer Tracker sensors. Several test structures and sensors were designed and implemented on 18 different combinations of wafer materials, thicknesses, and production technologies. The devices were electrically characterized before and after irradiation with neutrons, and with protons of different energies, with fluences corresponding to those expected at different radii of the CMS Outer Tracker after 3000 fb−1. The tests performed include studies with β sources, lasers, and beam scans. This paper compares the performance of different options for the HL-LHC silicon sensors with a focus on silicon bulk material and thickness. Copyright © 2020, The Authors. All rights reserved.

关键词： Luminance

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Observation of tW production in the single-lepton channel in pp collisions at √s = 13 TeV

arXiv

引用

arXiv 2021年

作者： Tumasyan, A. Sirunyan, A.M. Adam, W. Ambrogi, F. Asilar, E. Bergauer, T. Brandstetter, J. Brondolin, E. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Ghete, V.M. Hrubec, J. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Rohringer, H. Schieck, J. Schöfbeck, R. Spanring, M. Spitzbart, D. Taurok, A. Waltenberger, W. Wittmann, J. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Mossolov, V. Suarez Gonzalez, J. De Wolf, E.A. Di Croce, D. Janssen, X. Lauwers, J. Pieters, M. Van De Klundert, M. Van Haevermaet, H. Van Mechelen, P. Van Remortel, N. Abu Zeid, S. Blekman, F. D'Hondt, J. De Bruyn, I. De Clercq, J. Deroover, K. Flouris, G. Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. Moreels, L. python, q. Skovpen, K. Tavernier, S. Van Doninck, W. Van Mulders, P. Van Parijs, I. Beghin, D. Bilin, B. Brun, H. Clerbaux, B. De Lentdecker, G. Delannoy, H. Dorney, B. Fasanella, G. Favart, L. Goldouzian, R. Grebenyuk, A. Kalsi, A.K. Lenzi, T. Luetic, J. Postiau, N. Starling, E. Thomas, L. Vander Velde, C. Vanlaer, P. Vannerom, D. Wang, q. Cornelis, T. Dobur, D. Fagot, A. Gul, M. Khvastunov, I. Poyraz, D. Roskas, C. Trocino, D. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Zaganidis, N. Bakhshiansohi, H. Bondu, O. Brochet, S. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Francois, B. Giammanco, A. Krintiras, G. Lemaitre, V. Magitteri, A. Mertens, A. Musich, M. Piotrzkowski, K. Saggio, A. Vidal Marono, M. Wertz, S. Zobec, J. Alves, F.L. Alves, G.A. Brito, L. Correia Silva, G. Hensel, C. Moraes, A. Pol, M.E. Rebello Teles, P. Belchior Batista Das Chagas, E. Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. Fonseca De Souza, S. Malbouisson, H. Matos Figueiredo, D. Melo De Almeida, M. Mora Herrera, C. Mundim, L. Nogima, H. Prado Da Silva, W.L. Sanchez Rosas, L.J. Santoro, A. Sznajder, A. Thiel, M. Tonelli Manganote, E.J. Torres Da Silva De Araujo, F. Vilela Pereira, A. Ahuja, S. Bernardes, C.A. Calligari Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Tsinghua University Beijing China Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole polytechnique CNRS/IN2P3 Université Paris-Saclay Palaiseau France Université de Strasbourg CNRS IPHC UMR 7178 StrasbourgF-67000 France Centre de Calcul de l'Institut National de Physique Nucl

A measurement of the cross section of the associated production of a single top quark and a W boson in final states with a muon or electron and jets in proton-proton collisions at √s = 13 TeV is presented. The data correspond to an integrated luminosity of 36 fb-1collected with the CMS detector at the CERN LHC in 2016. A boosted decision tree is used to separate the tW signal from the dominant tt background, whilst the subleading W+jets and multijet backgrounds are constrained using data-based estimates. This result is the first observation of the tW process in final states containing a muon or electron and jets, with a significance exceeding 5 standard deviations. The cross section is determined to be 89 ± 4 (stat) ± 12 (syst) pb, consistent with the standard model. © 2021, CC BY.

关键词： Charged particles

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Observation of Higgs Boson Decay to Bottom quarks

引用

Physical Review Letters 2018年第12期121卷 121801-121801页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi E. Asilar T. Bergauer J. Brandstetter M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth V. M. Ghete J. Hrubec M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad H. Rohringer J. Schieck R. Schöfbeck M. Spanring D. Spitzbart W. Waltenberger J. Wittmann C.-E. Wulz M. Zarucki V. Chekhovsky V. Mossolov J. Suarez Gonzalez E. A. De Wolf D. Di Croce X. Janssen J. Lauwers M. Pieters H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Abu Zeid F. Blekman J. D’Hondt J. De Clercq K. Deroover G. Flouris D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat L. Moreels q. python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney G. Fasanella L. Favart R. Goldouzian A. Grebenyuk A. K. Kalsi T. Lenzi J. Luetic N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom q. Wang T. Cornelis D. Dobur A. Fagot M. Gul I. Khvastunov D. Poyraz C. Roskas D. Trocino M. Tytgat W. Verbeke B. Vermassen M. Vit N. Zaganidis H. Bakhshiansohi O. Bondu S. Brochet G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco G. Krintiras V. Lemaitre A. Magitteri K. Piotrzkowski A. Saggio M. Vidal Marono P. Vischia S. Wertz J. Zobec F. L. Alves G. A. Alves M. Correa Martins Junior G. Correia Silva C. Hensel A. Moraes M. E. Pol P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza H. Malbouisson D. Matos Figueiredo M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira S. Ahuja C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. Shopova G. Sultanov A. Di Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium The University of Kansas Lawrence Kansas USA Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China CERN European Organization for Nuclear Research Geneva Switzerland Texas Tech University Lubbock Texas USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince

The observation of the standard model (SM) Higgs boson decay to a pair of bottom quarks is presented. The main contribution to this result is from processes in which Higgs bosons are produced in association with a W or Z boson (VH), and are searched for in final states including 0, 1, or 2 charged leptons and two identified bottom quark jets. The results from the measurement of these processes in a data sample recorded by the CMS experiment in 2017, comprising 41.3 fb−1 of proton-proton collisions at s=13 TeV, are described. When combined with previous VH measurements using data collected at s=7, 8, and 13 TeV, an excess of events is observed at mH=125 GeV with a significance of 4.8 standard deviations, where the expectation for the SM Higgs boson is 4.9. The corresponding measured signal strength is 1.01±0.22. The combination of this result with searches by the CMS experiment for H→bb¯ in other production processes yields an observed (expected) significance of 5.6 (5.5) standard deviations and a signal strength of 1.04±0.20.

关键词： Particle decays Bottom quark Higgs bosons Hadron colliders

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Search for Narrow Resonances in the b-Tagged Dijet Mass Spectrum in Proton-Proton Collisions at s=8 TeV

引用

Physical Review Letters 2018年第20期120卷 201801-201801页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi E. Asilar T. Bergauer J. Brandstetter E. Brondolin M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl M. Friedl R. Frühwirth V. M. Ghete J. Grossmann J. Hrubec M. Jeitler A. König N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec E. Pree N. Rad H. Rohringer J. Schieck R. Schöfbeck M. Spanring D. Spitzbart A. Taurok W. Waltenberger J. Wittmann C.-E. Wulz M. Zarucki V. Chekhovsky V. Mossolov J. Suarez Gonzalez E. A. De Wolf D. Di Croce X. Janssen J. Lauwers M. Pieters M. Van De Klundert H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Abu Zeid F. Blekman J. D’Hondt I. De Bruyn J. De Clercq K. Deroover G. Flouris D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat L. Moreels q. python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney G. Fasanella L. Favart R. Goldouzian A. Grebenyuk A. K. Kalsi T. Lenzi J. Luetic T. Seva E. Starling C. Vander Velde P. Vanlaer D. Vannerom R. Yonamine T. Cornelis D. Dobur A. Fagot M. Gul I. Khvastunov D. Poyraz C. Roskas D. Trocino M. Tytgat W. Verbeke B. Vermassen M. Vit N. Zaganidis H. Bakhshiansohi O. Bondu S. Brochet G. Bruno C. Caputo A. Caudron P. David S. De Visscher C. Delaere M. Delcourt B. Francois A. Giammanco G. Krintiras V. Lemaitre A. Magitteri A. Mertens M. Musich K. Piotrzkowski L. quertenmont A. Saggio M. Vidal Marono S. Wertz J. Zobec W. L. Aldá Júnior F. L. Alves G. A. Alves L. Brito G. Correia Silva C. Hensel A. Moraes M. E. Pol P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza H. Malbouisson M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira S. Ahuja C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes Sandra S. Padula Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China CERN European Organization for Nuclear Research Geneva Switzerland Texas Tech University Lubbock Texas USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA Universidad de Los Andes Bogota Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Saha Institute of Nuclear Physics HBNI Kolkata India Laboratoire Leprinc

A search for narrow resonances decaying to bottom quark-antiquark pairs is presented, using a data sample of proton-proton collisions at s=8 TeV corresponding to an integrated luminosity of 19.7 fb−1. The search is extended to masses lower than those reached in typical searches for resonances decaying into jet pairs at the LHC, by taking advantage of triggers that identify jets originating from bottom quarks. No significant excess of events is observed above the background predictions. Limits are set on the product of cross section and branching fraction to bottom quarks for spin 0, 1, and 2 resonances in the mass range of 325–1200 GeV. These results improve on the limits for resonances decaying into jet pairs in the 325–500 GeV mass range.

关键词： Hypothetical particle physics models Particle production quark & gluon jets Bottom quark Hypothetical gauge bosons Hadron colliders

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Search for W Boson Decays to Three Charged Pions

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Physical Review Letters 2019年第15期122卷 151802-151802页

作者： A. M. Sirunyan A. Tumasyan W. Adam F. Ambrogi E. Asilar T. Bergauer J. Brandstetter M. Dragicevic J. Erö A. Escalante Del Valle M. Flechl R. Frühwirth V. M. Ghete J. Hrubec M. Jeitler N. Krammer I. Krätschmer D. Liko T. Madlener I. Mikulec N. Rad H. Rohringer J. Schieck R. Schöfbeck M. Spanring D. Spitzbart W. Waltenberger J. Wittmann C.-E. Wulz M. Zarucki V. Chekhovsky V. Mossolov J. Suarez Gonzalez E. A. De Wolf D. Di Croce X. Janssen J. Lauwers A. Lelek M. Pieters H. Van Haevermaet P. Van Mechelen N. Van Remortel F. Blekman J. D’Hondt J. De Clercq K. Deroover G. Flouris D. Lontkovskyi S. Lowette I. Marchesini S. Moortgat L. Moreels q. python K. Skovpen S. Tavernier W. Van Doninck P. Van Mulders I. Van Parijs D. Beghin B. Bilin H. Brun B. Clerbaux G. De Lentdecker H. Delannoy B. Dorney G. Fasanella L. Favart A. Grebenyuk A. K. Kalsi J. Luetic A. Popov N. Postiau E. Starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom q. Wang T. Cornelis D. Dobur A. Fagot M. Gul I. Khvastunov C. Roskas D. Trocino M. Tytgat W. Verbeke B. Vermassen M. Vit N. Zaganidis O. Bondu G. Bruno C. Caputo P. David C. Delaere M. Delcourt A. Giammanco G. Krintiras V. Lemaitre A. Magitteri K. Piotrzkowski A. Saggio M. Vidal Marono P. Vischia J. Zobec F. L. Alves G. A. Alves G. Correia Silva C. Hensel A. Moraes M. E. Pol P. Rebello Teles E. Belchior Batista Das Chagas W. Carvalho J. Chinellato E. Coelho E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao C. De Oliveira Martins S. Fonseca De Souza L. M. Huertas Guativa H. Malbouisson D. Matos Figueiredo M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima W. L. Prado Da Silva L. J. Sanchez Rosas A. Santoro A. Sznajder M. Thiel E. J. Tonelli Manganote F. Torres Da Silva De Araujo A. Vilela Pereira S. Ahuja C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev A. Marinov M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov L. Litov B. Pavlov P. Petkov W. Fang X. Gao L. Yuan M. Ahmad Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium The University of Kansas Lawrence Kansas USA Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China National Centre for Physics Quaid-I-Azam University Islamabad Pakistan Institute of High Energy Physics Beijing China CERN European Organization for Nuclear Research Geneva Switzerland State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Virginia Charlottesville Virginia USA Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif

For the first time, a search for the rare decay of the W boson to three charged pions has been performed. Proton-proton collision data recorded by the CMS experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 77.3 fb−1, have been analyzed. No significant excess is observed above the background expectation. An upper limit of 1.01×10−6 is set at 95% confidence level on the branching fraction of the W boson to three charged pions. This provides a strong motivation for theoretical calculations of this branching fraction.

关键词： Particle decays W & Z bosons Hadron colliders

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