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arXiv 2019年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Brandstetter, J. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schfbeck, R. Spanring, M. Spitzbart, D. Waltenberger, W. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Mossolov, V. Suarez Gonzalez, J. Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Lauwers, J. 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. 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. 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. Correa Martins, M. Correia Silva, G. Hensel, C. Moraes, A. Pol, M.E. Rebello Teles, P. Das Chagas, E. Belchior Batista Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. De Souza, S. Fonseca Malbouisson, H. Matos Figueiredo, D. De Almeida, M. Melo 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. Da Silva De Araujo, F. Torres Vilela Pereira, A. Ahuja, S. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Padul Yerevan Physics Institute Yerevan Armenia Institut Fr Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Universit Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Universit 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 So Paulo Brazil Universidade Federal Do ABC So 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 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 Universit Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS IN2P3 Universit Paris-Saclay Palaiseau France Universit de Strasbourg CNRS IPHC UMR 7178 Strasbourg France Centre de Calcul de l'Inst

A search is presented for a charged Higgs boson heavier than the top quark, produced in association with a top quark, or with a top and a bottom quark, and decaying into a top-bottom quark-antiquark pair. The search is performed using proton-proton collision data collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb-1. Events are selected by the presence of a single isolated charged lepton (electron or muon) or an oppositesign dilepton (electron or muon) pair, categorized according to the jet multiplicity and the number of jets identified as originating from b quarks. Multivariate analysis techniques are used to enhance the discrimination between signal and background in each category. The data are compatible with the standard model, and 95% confidence level upper limits of 9.6-0.01 pb are set on the charged Higgs boson production cross section times branching fraction to a top-bottom quark-antiquark pair, for charged Higgs boson mass hypotheses ranging from 200 GeV to 3 TeV. The upper limits are interpreted in different minimal supersymmetric extensions of the standard model. Copyright © 2019, The Authors. All rights reserved.

关键词： Bosons

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Search for the production of W±W±W±events 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. Er, J. Escalante Del Valle, A. Flechl, M. Frhwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schfbeck, R. Spanring, M. Spitzbart, D. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Mossolov, V. Suarez Gonzalez, J. Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Lauwers, J. 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. 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. Favart, L. Grebenyuk, A. Kalsi, A.K. Luetic, J. Popov, A. Postiau, N. Starling, E. Thomas, L. Vander Velde, C. Vanlaer, P. Vannerom, D. Wang, Q. Cornelis, T. Dobur, D. Khvastunov, I. Roskas, C. Trocino, D. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Zaganidis, N. Bondu, O. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. Giammanco, A. Lemaitre, V. Magitteri, A. Prisciandaro, J. Saggio, A. Vidal Marono, M. Vischia, P. Zobec, J. Alves, F.L. Alves, G.A. Correa Martins, M. Correia Silva, G. Hensel, C. Moraes, A. Pol, M.E. Rebello Teles, P. Das Chagas, E. Belchior Batista Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. De Souza, S. Fonseca Malbouisson, H. Matos Figueiredo, D. De Almeida, M. Melo 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. Da Silva De Araujo, F. Torres Vilela Pereira, A. Ahuja, S. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Padula, Sandra S. Aleksandrov, A. Hadjiiska, R. Iaydjiev, P. Marinov, A. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. Dimitrov, A. Litov, L. Pa Yerevan Physics Institute Yerevan Armenia Institut Fr Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Universit Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Universit 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 So Paulo Brazil Universidade Federal Do ABC So 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 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 Universit Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS IN2P3 Universit Paris-Saclay Palaiseau France Universit de Strasbourg CNRS IPHC UMR 7178 Strasbourg France Centre de Calcul de l'Inst

A search for the production of events containing three W bosons predicted by the standard model is reported. The search is based on a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the CERN LHC and corresponding to a total integrated luminosity of 35.9 fb-1. The search is performed in final states with three leptons (electrons or muons), or with two same-charge leptons plus two jets. The observed (expected) significance of the signal for W±W±W±production is 0.60 (1.78) standard deviations, and the ratio of the measured signal yield to that expected from the standard model is 0.34+0.62-0.34. Limits are placed on three anomalous quartic gauge couplings and on the production of massive axionlike particles. Copyright © 2019, The Authors. All rights reserved.

关键词： Bosons

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Search for supersymmetry using Higgs boson to diphoton decays at √s = 13 TeV

arXiv

引用

arXiv 2019年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Asilar, E. Bergauer, T. Brandstetter, J. Dragicevic, M. Erö, J. Escalante Del Valle, A. Flechl, M. Frühwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schfbeck, R. Spanring, M. Spitzbart, D. Waltenberger, W. Wulz, C.-E. Zarucki, M. Chekhovsky, 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. 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. 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. Correa Martins, M. Correia Silva, G. Hensel, C. Moraes, A. Pol, M.E. Rebello Teles, P. Das Chagas, E. Belchior Batista Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. De Souza, S. Fonseca Malbouisson, H. Matos Figueiredo, D. De Almeida, M. Melo 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. Da Silva De Araujo, F. Torres Vilela Pereira, A. Ahuja, S. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Padula, Sandra S. Aleksandrov, A. Yerevan Physics Institute Yerevan Armenia Institut Fr Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Universit Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Universit 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 So Paulo Brazil Universidade Federal Do ABC So 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 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 Universit Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS IN2P3 Universit Paris-Saclay Palaiseau France Universit de Strasbourg CNRS IPHC UMR 7178 Strasbourg France Centre de Calcul de l'Inst

A search for supersymmetry (SUSY) is presented where at least one Higgs boson is produced and decays to two photons in the decay chains of pair-produced SUSY particles. Two complementary analysis strategies are pursued: one focused on strong SUSY production and the other focused on electroweak SUSY production. The presence of charged leptons, additional Higgs boson candidates, and various kinematic variables are used to categorize events into search regions that are sensitive to different SUSY scenarios. The results are based on data from proton-proton collisions at the Large Hadron Collider at a center-of-mass energy of 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 77.5 fb-1. No statistically significant excess of events is observed relative to the standard model expectations. We exclude bottom squark pair production for bottom squark masses below 530 GeV and a lightest SUSY particle mass of 1 GeV;wino-like chargino-neutralino production for chargino and neutralino masses below 235GeV with a gravitino mass of 1 GeV;and higgsino-like chargino-neutralino production in the case where the neutralino decays exclusively to a Higgs boson and a gravitino for neutralino masses below 290 GeV. Copyright © 2019, The Authors. All rights reserved.

关键词： Bosons

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Measurements of the pp → WZ inclusive and differential production cross sections and constraints on charged anomalous triple gauge couplings at √s = 13 TeV

arXiv

引用

arXiv 2019年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Asilar, E. Bergauer, T. Brandstetter, J. Dragicevic, M. Erö, J. Del Valle, A. Escalante 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. Gonzalez, J. Suarez de Wolf, E.A. Di Croce, D. Janssen, X. Lauwers, J. Pieters, M. van Haevermaet, H. van Mechelen, P. van Remortel, N. Zeid, S. Abu Blekman, F. D’Hondt, J. 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. Fasanella, G. 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. Velde, C. Vander 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. Giammanco, A. Krintiras, G. Lemaitre, V. Magitteri, A. Piotrzkowski, K. Saggio, A. Marono, M. Vidal Vischia, P. Wertz, S. Zobec, J. Alves, F.L. Alves, G.A. Martins, M. Correa Silva, G. Correia Hensel, C. Moraes, A. Pol, M.E. Teles, P. Rebello Chagas, E. Belchior Batista Das Carvalho, W. Chinellato, J. Coelho, E. da Costa, E.M. da Silveira, G.G. de Jesus Damiao, D. de Oliveira Martins, C. de Souza, S. Fonseca Malbouisson, H. Figueiredo, D. Matos de Almeida, M. Melo Herrera, C. Mora Mundim, L. Nogima, H. da Silva, W.L. Prado Rosas, L.J. Sanchez Santoro, A. Sznajder, A. Thiel, M. Manganote, E.J. Tonelli da Silva De Araujo, F. Torres Pereira, A. Vilela Ahuja, S. Bernardes, C.A. Calligaris, L. Perez Tomei, T.R. Fernandez Novaes, S.F. P 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 Strasbourg France Centre de Calcul de l’Institut National de Physique Nucleaire et

The WZ production cross section is measured in proton-proton collisions at a centreof-mass energy √s = 13 TeV using data collected with the CMS detector, corresponding to an integrated luminosity of 35.9 fb−1. The inclusive cross section is measured to be σtot(pp → WZ) = 48.09+−1.000.96 (stat)+−0.440.37 (theo)+−2.392.17 (syst) ± 1.39 (lumi) pb, resulting in a total uncertainty of −2.78/+2.98 pb. Fiducial cross section and ratios of charge-dependent cross section measurements are provided. Differential cross section measurements are also presented with respect to three variables: the Z boson transverse momentum pT, the leading jet pT, and the M(WZ) variable, defined as the invariant mass of the system composed of the three leptons and the missing transverse momentum. Differential measurements with respect to the W boson pT, separated by charge, are also shown. Results are consistent with standard model predictions, favouring next-to-next-to-leading-order predictions over those at next-to-leading order. Constraints on anomalous triple gauge couplings are derived via a binned maximum likelihood fit to the M(WZ) variable. Copyright © 2019, The Authors. All rights reserved.

关键词： Maximum likelihood

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Determination of the strong coupling constant aS(mZ) from measurements of inclusiveW and Z boson production cross sections in proton-proton collisions at p s = 7 and 8 TeV

arXiv

引用

arXiv 2019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. 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. 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. 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. 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. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Lemos, D.S. Mercadante, P.G. Novaes, S.F. Padula, Sandra S Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. Bonchev, M. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Fang, W. Gao, X. Yuan, L. Che Yerevan Physics Institute Yerevan Armenia Institut fur Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Universite Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Universite 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 Zhejiang University Hangzhou China 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 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 Universite Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet CNRS/INP Ecole Polytechnique Institut Polytechnique de Paris Universite de Strasbourg Cnrs Iphc Umr Strasbourg France Centre d

Twelve measurements of inclusive cross sections ofW and Z boson production, performed in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, are compared with perturbative quantum chromodynamics calculations at next-To-next-Toleading order (NNLO) accuracy obtained with the CT14, HERAPDF2.0, MMHT14, and NNPDF3.0 parton distribution functions (PDFs). data and theory agree well for all PDF sets, taking into account the experimental and theoretical uncertainties. A novel procedure is employed to extract the strong coupling constant at the Z pole mass from a detailed comparison of all the experimental fiducial cross sections to the corresponding NNLO theoretical predictions, yielding aS(mZ) = 0.1163+0.0024-0.0031 (CT14), 0.1072+0.0043-0.0040 (HERAPDF2.0), 0.1186-0.0025 (MMHT14), and 0.1147-0.0023 (NNPDF3.0). Using the results obtained with the CT14 and MMHT14 PDFs, which yield the most robust and stable aS(mZ) extractions, a value aS(mZ) = 0.1175+0.0025-0.0028 is determined. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum theory

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Search for long-lived particles using nonprompt jets and missing transverse momentum with 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. Er, J. Escalante Del Valle, A. Flechl, M. Frhwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schfbeck, R. Spanring, M. Spitzbart, D. Waltenberger, W. Wulz, C.-E. Zarucki, M. Chekhovsky, 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. 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. 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. Correa Martins, M. Correia Silva, G. Hensel, C. Moraes, A. Pol, M.E. Rebello Teles, P. Das Chagas, E. Belchior Batista Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. De Souza, S. Fonseca Malbouisson, H. Matos Figueiredo, D. De Almeida, M. Melo 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. Da Silva De Araujo, F. Torres Vilela Pereira, A. Ahuja, S. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Padula, Sandra S. A Yerevan Physics Institute Yerevan Armenia Institut Fr Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Universit Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Universit 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 So Paulo Brazil Universidade Federal Do ABC So 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 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 Universit Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS IN2P3 Universit Paris-Saclay Palaiseau France Universit de Strasbourg CNRS IPHC UMR 7178 Strasbourg France Centre de Calcul de l'Inst

A search for long-lived particles decaying to displaced, nonprompt jets and missing transverse momentum is presented. The data sample corresponds to an integrated luminosity of 137 fb-1of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 2016-2018. Candidate signal events containing nonprompt jets are identified using the timing capabilities of the CMS electromagnetic calorimeter. The results of the search are consistent with the background prediction and are interpreted using a gauge-mediated supersymmetry breaking reference model with a gluino next-to-lightest supersymmetric particle. In this model, gluino masses up to 2100, 2500, and 1900 GeV are excluded at 95% confidence level for proper decay lengths of 0.3, 1, and 100 m, respectively. These are the best limits to date for such massive gluinos with proper decay lengths greater than ~0.5 m. Copyright © 2019, The Authors. All rights reserved.

关键词： Supersymmetry

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Measurement of electroweak production of a W boson in association with two jets 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. 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 is presented of electroweak (EW) production of a W boson in association with two jets in proton-proton collisions at √s = 13 TeV. The data sample was recorded by the CMS Collaboration at the LHC and corresponds to an integrated luminosity of 35.9 fb−1. The measurement is performed for the `νjj final state (with `ν indicating a lepton-neutrino pair, and j representing the quarks produced in the hard interaction) in a kinematic region defined by invariant mass mjj > 120 GeV and transverse momenta pTj > 25 GeV. The cross section of the process is measured in the electron and muon channels yielding σEW(Wjj) = 6.23 ± 0.12 (stat) ± 0.61 (syst) pb per channel, in agreement with leading-order standard model predictions. The additional hadronic activity of events in a signal-enriched region is studied, and the measurements are compared with predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. Limits on anomalous trilinear gauge couplings associated with dimension-six operators are given in the framework of an effective field theory. The corresponding 95% confidence level intervals are −2.3 WWW/Λ2 −2, −8.8 W/Λ2 −2, and −45 B/Λ2 −2. These results are combined with the CMS EW Zjj analysis, yielding the constraint on the cWWW coupling: −1.8 WWW/Λ2 −2. Copyright © 2019, The Authors. All rights reserved.

关键词： Gages

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Search for physics beyond the standard model in events with overlapping photons and jets

arXiv

引用

arXiv 2019年

作者： Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Asilar, E. Bergauer, T. Brandstetter, J. Dragicevic, M. Er, J. Escalante Del Valle, A. Flechl, M. Frhwirth, R. Jeitler, M. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Rad, N. Schieck, J. Schfbeck, R. Spanring, M. Spitzbart, D. Waltenberger, W. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Mossolov, V. Suarez Gonzalez, J. Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Lauwers, J. 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. 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. 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. Correa Martins, M. Correia Silva, G. Hensel, C. Moraes, A. Pol, M.E. Rebello Teles, P. Das Chagas, E. Belchior Batista Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Oliveira Martins, C. De Souza, S. Fonseca Malbouisson, H. Matos Figueiredo, D. De Almeida, M. Melo 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. Da Silva De Araujo, F. Torres Vilela Pereira, A. Ahuja, S. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S Yerevan Physics Institute Yerevan Armenia Institut Fr Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Universit Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Universit 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 So Paulo Brazil Universidade Federal Do ABC So 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 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 Universit Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS IN2P3 Universit Paris-Saclay Palaiseau France Universit de Strasbourg CNRS IPHC UMR 7178 Strasbourg France Centre de Calcul de l'Inst

Results are reported from a search for new particles that decay into a photon and two gluons, in events with jets. Novel jet substructure techniques are developed that allow photons to be identified in an environment densely populated with hadrons. The analyzed proton-proton collision data were collected by the CMS experiment at the LHC, in 2016 at √s = 13 TeV, and correspond to an integrated luminosity of 35.9 fb-1. The spectra of total transverse hadronic energy of candidate events are examined for deviations from the standard model predictions. No statistically significant excess is observed over the expected background. The first cross section limits on new physics processes resulting in such events are set. The results are interpreted as upper limits on the rate of gluino pair production, utilizing a simplified stealth supersymmetry model. The excluded gluino masses extend up to 1.7 TeV, for a neutralino mass of 200 GeV and exceed previous mass constraints set by analyses targeting events with isolated photons. Copyright © 2019, The Authors. All rights reserved.

关键词： Photons

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Measurement of tt normalised multi-differential cross sections in pp collisions at √s = 13 TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

arXiv

引用

arXiv 2019年

Normalised multi-differential cross sections for top quark pair (tt) production are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9 fb−1. The double-differential tt cross section is measured as a function of the kinematic properties of the top quark and of the tt system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the tt system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength αS and the top quark pole mass (mpolet ) using several sets of parton distribution functions (PDFs). Furthermore, a simultaneous fit of the PDFs, αS, and mpolet is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of αS and mpolet . Copyright © 2019, The Authors. All rights reserved.

关键词： Poles

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A deep neural network to search for new long-lived particles decaying to jets the CMS Collaboration

arXiv

引用

arXiv 2019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. J. Suarez Gonzalez Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Kello, T. Lelek, A. Pieters, M. Rejeb Sfar, H. Van Haevermaet, H. Van Mechelen, P. Van Putte, S. Van Remortel F. Blekman, N. 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. Bernardesa, C.A. Calligarisa, L. Fernandez Perez Tomeia, T.R. Gregoresb, E.M. Lemos, D.S. Mercadanteb, P.G. Novaes, S.F. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. Bonchev, M. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Fang, W. Gao, X. Yuan, L. Chen, G.M. Yerevan Physics Institute Yerevan Armenia Institut fur Hochenergiephysik Wien Australia Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Universite Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Universite 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 Sao 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 Zhejiang University Hangzhou China 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 Egypt 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 Universite Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet CNRS/IN2P Ecole Polytechnique de Paris France Universite de Strasbourg Cnrs Iphc Umr Strasbourg France Centre de Calcul de L'Institut Nat

A tagging algorithm to identify jets that are significantly displaced from the protonproton (pp) collision region in the CMS detector at the LHC is presented. Displaced jets can arise from the decays of long-lived particles (LLPs), which are predicted by several theoretical extensions of the standard model. The tagger is a multiclass classifier based on a deep neural network, which is parameterised according to the proper decay length ct0 of the LLP. A novel scheme is defined to reliably label jets from LLP decays for supervised learning. Samples of pp collision data, recorded by the CMS detector at a centre-of-mass energy of 13 TeV, and simulated events are used to train the neural network. Domain adaptation by backward propagation is performed to improve the simulation modelling of the jet class probability distributions observed in pp collision data. The potential performance of the tagger is demonstrated with a search for long-lived gluinos, a manifestation of split supersymmetric models. The tagger provides a rejection factor of 10 000 for jets from standard model processes, while maintaining an LLP jet tagging efficiency of 30-80% for gluinos with 1mm ct0 10 m. The expected coverage of the parameter space for split supersymmetry is presented. Copyright © 2019, arXiv, All rights reserved.

关键词： Probability distributions

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