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search for Long-Lived Particles Decaying in the CMs end Cap Muon Detectors in Proton-Proton Collisions at s=13 TeV

Physical Review Letters 2021年第26期127卷 261804-261804页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer s. Chatterjee M. Dragicevic A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec P. Paulitsch F. M. Pitters J. schieck R. schöfbeck D. schwarz s. Templ W. Waltenberger C.-e. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish e. A. De Wolf T. Janssen T. Kello A. Lelek H. Rejeb sfar P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols J. D’Hondt M. Delcourt H. el Faham s. Lowette s. Moortgat A. Morton D. Müller A. R. sahasransu s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker L. Favart A. Grebenyuk A. K. Kalsi K. Lee M. Mahdavikhorrami I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas M. Vanden bemden C. Vander Velde P. Vanlaer L. Wezenb.e. T. Cornelis D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach M. Niedziela C. Roskas A. samalan K. skovpen M. Tytgat b. Vermassen M. Vit A. benecke A. bethani G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco K. Jaffel sa. Jain V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn T. T. Tran P. Vischia s. Wertz G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson W. Carvalho J. Chinellato e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza D. Matos Figueiredo C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima P. Rebello Teles A. santoro s. M. silva Do Amaral A. sznajder M. Thiel F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. bauer C. Dozen Z. Hu J. Martins Y. Wang K. Yi e. Chapon G. M. Chen H. s. Chen M. Chen F. Iemmi A. Kapoor D. Leggat H. Liao Z.-A. Liu V. Mi 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 Korea University Seoul Korea 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 Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai 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 Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physic

A search for long-lived particles (LLPs) produced in decays of standard model (sM) Higgs bosons is presented. The data sample consists of 137 fb−1 of proton-proton collisions at s=13 TeV, recorded at the LHC in 2016–2018. A novel technique is employed to reconstruct decays of LLPs in the end cap muon detectors. The search is sensitive to a broad range of LLP decay modes and to masses as low as a few GeV. No excess of events above the sM background is ob.e.ved. The most stringent limits to date on the branching fraction of the Higgs boson to LLPs sub.e.uently decaying to quarks and τ+τ− are found for proper decay lengths greater than 6, 20, and 40 m, for LLP masses of 7, 15, and 40 GeV, respectively.

关键词： Hypothetical particles Tau leptons Hadron colliders

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Ob.e.vation of Forward Neutron Multiplicity Dependence of Dimuon Acoplanarity in Ultraperipheral Pb-Pb Collisions at sNN=5.02 TeV

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Physical Review Letters 2021年第12期127卷 122001-122001页

作者： A. M. sirunyan A. Tumasyan W. Adam T. bergauer M. Dragicevic J. erö A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. schieck R. schöfbeck M. spanring s. Templ W. Waltenberger C.-e. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb sfar H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat A. Morton Q. Python s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker b. Dorney L. Favart A. Grebenyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.e. T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. skovpen M. Tytgat W. Verbeke b. Vermassen M. Vit G. bruno F. bury C. Caputo P. David C. Delaere M. Delcourt I. s. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia s. Wuyckens J. Zobec G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior e. belchior batista Das Chagas H. brandao Malbouisson W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza J. Martins D. Matos Figueiredo M. Medina Jaime C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. sanchez Rosas A. santoro s. M. silva Do Amaral A. sznajder M. Thiel F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov M. bonchev A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov W. Fang Q. Guo H. Wang L. Yuan M. Ahmad Z. Hu Y. Wang e. Chapon G. M. Chen H. s. Chen M. Chen T. Javaid A. Kapoor D. 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 Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai 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 Egypt Center for High En

The first measurement of the dependence of γγ→μ+μ− production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions at sNN=5.02 TeV, with an integrated luminosity of approximately 1.5 nb−1, are collected using the CMs detector at the LHC. The azimuthal correlations between the two muons in the invariant mass region 8eV are extracted for events including 0, 1, or at least 2 neutrons detected in the forward pseudorapidity range |η|>8.3. The back-to-back correlation structure from leading-order photon-photon scattering is found to be significantly broader for events with a larger number of emitted neutrons from each nucleus, corresponding to interactions with a smaller impact parameter. This ob.e.vation provides a data-driven demonstration that the average transverse momentum of photons emitted from relativistic heavy ions has an impact parameter dependence. These results provide new constraints on models of photon-induced interactions in ultraperipheral collisions. They also provide a baseline to search for possib.e.final-state effects on lepton pairs caused by traversing a quark-gluon plasma produced in hadronic heavy ion collisions.

关键词： Nucleon-nucleon interactions Hadron colliders

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Constraints on the Initial state of Pb-Pb Collisions via Measurements of Z-boson Yields and Azimuthal Anisotropy at sNN=5.02 TeV

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Physical Review Letters 2021年第10期127卷 102002-102002页

作者： A. M. sirunyan A. Tumasyan W. Adam F. Ambrogi T. bergauer M. Dragicevic J. erö A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. schieck R. schöfbeck M. spanring s. Templ W. Waltenberger C.-e. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb sfar H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat A. Morton Q. Python s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker b. Dorney L. Favart A. Grebenyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.e. T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. skovpen M. Tytgat W. Verbeke b. Vermassen M. Vit G. bruno F. bury C. Caputo P. David C. Delaere M. Delcourt I. s. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia s. Wuyckens J. Zobec G. A. Alves G. Correia silva C. Hensel A. Moraes W. L. Aldá Júnior e. belchior batista Das Chagas H. brandao Malbouisson W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. sanchez Rosas A. santoro s. M. silva Do Amaral A. sznajder M. Thiel e. J. Tonelli Manganote F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov M. bonchev A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov W. Fang Q. Guo H. Wang L. Yuan M. Ahmad Z. Hu 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 Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai 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 Egypt Center for High Ener

The CMs experiment at the LHC has measured the differential cross sections of Z bosons decaying to pairs of leptons, as functions of transverse momentum and rapidity, in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measured Z boson elliptic azimuthal anisotropy coefficient is compatib.e.with zero, showing that Z bosons do not experience significant final-state interactions in the medium produced in the collision. Yields of Z bosons are compared to Glauber model predictions and are found to deviate from these expectations in peripheral collisions, indicating the presence of initial collision geometry and centrality selection effects. The precision of the measurement allows, for the first time, for a data-driven determination of the nucleon-nucleon integrated luminosity as a function of lead-lead centrality, thereby eliminating the need for its estimation based on a Glauber model.

关键词： Relativistic heavy-ion collisions W & Z bosons Hadron colliders

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Measurement of the Wγ Production Cross section in Proton-Proton Collisions at s=13 TeV and Constraints on effective Field Theory Coefficients

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Physical Review Letters 2021年第25期126卷 252002-252002页

作者： A. M. sirunyan A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer s. Chatterjee M. Dragicevic A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec F. M. Pitters J. schieck R. schöfbeck M. spanring s. Templ W. Waltenberger C.-e. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish e. A. De Wolf X. Janssen T. Kello A. Lelek H. Rejeb sfar P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols J. D’Hondt J. De Clercq M. Delcourt s. Lowette s. Moortgat A. Morton D. Müller A. R. sahasransu s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker L. Favart A. Grebenyuk A. K. Kalsi K. Lee I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.e. T. Cornelis D. Dobur M. Gruchala G. Mestdach M. Niedziela C. Roskas K. skovpen M. Tytgat W. Verbeke b. Vermassen M. Vit A. bethani G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia s. Wertz s. Wuyckens G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior M. barroso Ferreira Filho H. brandao Malbouisson W. Carvalho J. Chinellato e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza D. Matos Figueiredo C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima P. Rebello Teles L. J. sanchez Rosas A. santoro s. M. silva Do Amaral A. sznajder M. Thiel F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov T. Cheng W. Fang Q. Guo T. Javaid M. Mittal H. Wang L. Yuan M. Ahmad G. bauer C. Dozen Z. Hu J. Martins Y. Wang K. Yi e. Chapon G. M. Chen H. s. Chen M. Chen A. Kapoor D. Leggat H. Liao Z.-A. LIU R. sharma A. spiezia J. Tao J. Thomas-wils 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 Korea University Seoul Korea 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 Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai 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 Egypt Center for High Energy Physics (CHEP-FU) Fa

A fiducial cross section for Wγ production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in 137 fb−1 of data collected using the CMs detector at the LHC. The W→eν and μν decay modes are used in a maximum-likelihood fit to the lepton-photon invariant mass distribution to extract the combined cross section. The measured cross section is compared with theoretical expectations at next-to-leading order in quantum chromodynamics. In addition, 95% confidence level intervals are reported for anomalous triple-gauge couplings within the framework of effective field theory.

关键词： effective field theory Perturbative QCD W & Z bosons Hadron colliders

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Ob.e.vation of a New excited beauty strange baryon Decaying to Ξb−π+π−

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Physical Review Letters 2021年第25期126卷 252003-252003页

作者： A. M. sirunyan A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer s. Chatterjee M. Dragicevic A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec F. M. Pitters J. schieck R. schöfbeck M. spanring s. Templ W. Waltenberger C.-e. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish e. A. De Wolf X. Janssen T. Kello A. Lelek H. Rejeb sfar P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols J. D’Hondt J. De Clercq M. Delcourt s. Lowette s. Moortgat A. Morton D. Müller A. R. sahasransu s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker L. Favart A. Grebenyuk A. K. Kalsi K. Lee M. Mahdavikhorrami I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas M. Vanden bemden C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.e. T. Cornelis D. Dobur M. Gruchala L. Lamb.e.ht G. Mestdach M. Niedziela C. Roskas K. skovpen T. T. Tran M. Tytgat W. Verbeke b. Vermassen M. Vit A. bethani G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco K. Jaffel V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia s. Wertz s. Wuyckens G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior M. barroso Ferreira Filho H. brandao Malbouisson W. Carvalho J. Chinellato e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza D. Matos Figueiredo C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima P. Rebello Teles L. J. sanchez Rosas A. santoro s. M. silva Do Amaral A. sznajder M. Thiel F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov T. Cheng W. Fang Q. Guo T. Javaid M. Mittal H. Wang L. Yuan M. Ahmad G. bauer C. Dozen Z. Hu J. Martins Y. Wang K. Yi e. Chapon G. M. Chen H. s. Chen M. Chen F. Iemmi A 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 Korea University Seoul Korea 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 Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai 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 Egypt Center for High Energy Physics (CHEP-FU) Fa

The Ξb−π+π− invariant mass spectrum is investigated with an event sample of proton-proton collisions at s=13 TeV, collected by the CMs experiment at the LHC in 2016–2018 and corresponding to an integrated luminosity of 140 fb−1. The ground state Ξb− is reconstructed via its decays to J/ψΞ− and J/ψΛK−. A narrow resonance, labeled Ξb(6100)−, is ob.e.ved at a Ξb−π+π− invariant mass of 6100.3±0.2(stat)±0.1(syst)±0.6(Ξb−) MeV, where the last uncertainty reflects the precision of the Ξb− baryon mass. The upper limit on the Ξb(6100)− natural width is determined to be 1.9 MeV at 95% confidence level. The low Ξb(6100)− signal yield ob.e.ved in data does not allow a measurement of the quantum numbers of the new state. However, following analogies with the established excited Ξc baryon states, the new Ξb(6100)− resonance and its decay sequence are consistent with the orbitally excited Ξb− baryon, with spin and parity quantum numbers JP=3/2−.

关键词： bottom baryons Hadron colliders

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search for top squarks in final states with two top quarks and several light-flavor jets in proton-proton collisions at s=13 TeV

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Physical Review D 2021年第3期104卷 032006-032006页

作者： A. M. sirunyan A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer s. Chatterjee M. Dragicevic A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec F. M. Pitters J. schieck R. schöfbeck M. spanring s. Templ W. Waltenberger C.-e. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish e. A. De Wolf X. Janssen T. Kello A. Lelek H. Rejeb sfar P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols J. D’Hondt J. De Clercq M. Delcourt s. Lowette s. Moortgat A. Morton D. Müller A. R. sahasransu s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker L. Favart A. Grebenyuk A. K. Kalsi K. Lee M. Mahdavikhorrami I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas M. Vanden bemden C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.e. T. Cornelis D. Dobur M. Gruchala G. Mestdach M. Niedziela C. Roskas K. skovpen M. Tytgat W. Verbeke b. Vermassen M. Vit A. bethani G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia s. Wertz s. Wuyckens G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior M. barroso Ferreira Filho H. brandao Malbouisson W. Carvalho J. Chinellato e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza D. Matos Figueiredo C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima P. Rebello Teles L. J. sanchez Rosas A. santoro s. M. silva Do Amaral A. sznajder M. Thiel F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev I. Atanasov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov T. Cheng W. Fang Q. Guo T. Javaid M. Mittal H. Wang L. Yuan M. Ahmad G. bauer C. Dozen Z. Hu J. Martins Y. Wang K. Yi e. Chapon G. M. Chen H. s. Chen M. Chen A. Kapoor D. Leggat H. Liao Z.-A. LIU R. sha 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 Korea University Seoul Korea 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 Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai 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 Egypt Center for High Energy Physics (CHEP-FU) Fa

Many new physics models, including versions of supersymmetry characterized by R-parity violation (RPV), compressed mass spectra, long decay chains, or additional hidden sectors, predict the production of events with top quarks, low missing transverse momentum, and many additional quarks or gluons. The results of a search for new physics in events with two top quarks and additional jets are reported. The search is performed using events with at least seven jets and exactly one electron or muon. No requirement on missing transverse momentum is imposed. The study is based on a sample of proton-proton collisions at s=13TeV corresponding to 137 fb−1 of integrated luminosity collected with the CMs detector at the LHC in 2016–2018. The data are used to determine best fit values and upper limits on the cross section for pair production of top squarks in scenarios of RPV and stealth supersymmetry. Top squark masses up to 670 (870) GeV are excluded at 95% confidence level for the RPV (stealth) scenario, and the maximum ob.e.ved local signal significance is 2.8 standard deviations for the RPV scenario with top squark mass of 400 GeV.

关键词： supersymmetry Hadron colliders

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Recent developments in the PysCF program package

arXiv

引用

arXiv 2020年

作者： sun, Qiming Zhang, Xing banerjee, samragni bao, Peng barbry, Marc blunt, Nick s. bogdanov, Nikolay A. booth, George H. Chen, Jia Cui, Zhi-Hao eriksen, Janus Juul Gao, Yang Guo, sheng Hermann, Jan Hermes, Matthew R. Koh, Kevin Koval, Peter Lehtola, susi Li, Zhendong Liu, Junzi Mardirossian, Narbe McClain, James D. Motta, Mario Mussard, bastien Pham, Hung Q. Pulkin, Artem Purwanto, Wirawan Robinson, Paul J. Ronca, enrico sayfutyarova, elvira scheurer, Maximilian schurkus, Henry F. smith, James e.T. sun, Chong sun, shi-Ning Upadhyay, shiv Wagner, Lucas K. Wang, Xiao White, Alec Whitfield, James Daniel Williamson, Mark J. Wouters, sebastian Yang, Jun Yu, Jason M. Zhu, Tianyu berkelbach, Timothy C. sharma, sandeep sokolov, Alexander Yu. Chan, Garnet Kin-Lic AxiomQuant Investment Management LLC Shanghai200120 China Division of Chemistry and Chemical Engineering California Institute of Technology PasadenaCA91125 United States Department of Chemistry and Biochemistry The Ohio State University ColumbusOH43210 United States Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of Chemistry Chinese Academy of Sciences Beijing100190 China Simbeyond B.V. P.O. Box 513 EindhovenNL-5600 MB Netherlands Department of Chemistry Lensfield Road CambridgeCB2 1EW United Kingdom Max Planck Institute for Solid State Research Heisenbergstraße 1 Stuttgart70569 Germany Department of Physics King's College London Strand LondonWC2R 2LS United Kingdom Department of Physics University of Florida GainesvilleFL32611 United States Quantum Theory Project University of Florida GainesvilleFL32611 United States School of Chemistry University of Bristol Cantock's Close BristolBS8 1TS United Kingdom Division of Engineering and Applied Science California Institute of Technology PasadenaCA91125 United States Google Inc. Mountain ViewCA94043 United States FU Berlin Department of Mathematics and Computer Science Arnimallee 6 Berlin14195 Germany TU Berlin Machine Learning Group Marchstr. 23 Berlin10587 Germany Department of Chemistry Chemical Theory Center Supercomputing Institute University of Minnesota 207 Pleasant Street SE MinneapolisMN55455 United States Department of Chemistry and Biochemistry The University of Notre Dame du Lac 251 Nieuwland Science Hall Notre DameIN46556 United States Simune Atomistics S.L. Avenida Tolosa 76 Donostia-San Sebastian Spain HelsinkiFI-00014 Finland Key Laboratory of Theoretical and Computational Photochemistry Ministry of Education College of Chemistry Beijing Normal University Beijing100875 China Department of Chemistry The Johns Hopkins University BaltimoreMD21218 United States AMGEN

PYsCF is a Python-based general-purpose electronic structure platform that both supports first-principles simulations of molecules and solids, as well as accelerates the development of new methodology and complex computational workflows. The present paper explains the design and philosophy behind PYsCF that enab.e. it to meet these twin ob.e.tives. With several case studies, we show how users can easily implement their own methods using PYsCF as a development environment. We then summarize the capabilities of PYsCF for molecular and solid-state simulations. Finally, we describe the growing ecosystem of projects that use PYsCF across the domains of quantum chemistry, materials science, machine learning and quantum information science. Copyright © 2020, The Authors. All rights reserved.

关键词： Python

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Finding quadruply imaged quasars with machine learning. I. Methods

arXiv

引用

arXiv 2021年

作者： Akhazhanov, A. More, A. Amini, A. Hazlett, C. Treu, Tommaso birrer, s. shajib, A. schechter, P. Lemon, C. Nord, b. Aguena, M. Allam, s. Andrade-Oliveira, F. Annis, J. brooks, D. buckley-Geer, e. burke, D.L. Rosell, A. Carnero Kind, M. Carrasco Carretero, J. Choi, A. Conselice, C. Costanzi, M. Da Costa, L.N. Pereira, M.e.s. De Vicente, J. Desai, s. Dietrich, J.P. Doel, P. everett, s. Ferrero, I. Finley, D.A. Flaugher, b. Frieman, J. García-bellido, J. Gerdes, D.W. Gruen, D. Gruendl, R.A. Gschwend, J. Gutierrez, G. Hinton, s.R. Hollowood, D.L. Honscheid, K. James, D.J. Kim, A.G. Kuehn, K. Kuropatkin, N. Lahav, O. Lima, M. Lin, H. Maia, M.A.G. March, M. Menanteau, F. Miquel, R. Morgan, R. Palmese, A. Paz-Chinchón, F. Pieres, A. Malagón, A. A. Plazas sanchez, e. scarpine, V. serrano, s. sevilla-Noarbe, I. smith, M. soares-santos, M. suchyta, e. swanson, M.e.C. Tarle, G. To, C. Varga, T.N. Weller, J. Department of Electrical and Computer Engineering University of California Los AngelesCA90095 United States Department of Electrical and Computer Engineering Nazarbayev University Nur-Sultan Kazakhstan Post Bag 4 Ganeshkhind Pune411007 India UTIAS The University of Tokyo Kashiwa Chiba277-8583 Japan Department of Statistics University of California Los AngelesCA90095 United States Department of Political Science University of California Los AngelesCA90095 United States Department of Physics and Astronomy PAB 430 Portola Plaza Box 951547 Los AngelesCA90095-1547 United States Graduate School of Education Stanford University 160 450 Serra Mall StanfordCA94305 United States Department of Astronomy & Astrophysics University of Chicago ChicagoIL60637 United States MIT Kavli Institute for Astrophysics and Space Research 37-664G 77 Massachusetts Avenue CambridgeMA02139 United States Observatoire de Sauverny VersoixCH-1290 Switzerland Fermi National Accelerator Laboratory P. O. Box 500 BataviaIL60510 United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Instituto de Física Teórica Universidade Estadual Paulista São Paulo Brazil Department of Physics & Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Center for Astrophysical Surveys National Center for Supercomputing Applications 1205 West Clark St. UrbanaIL61801 United States Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street UrbanaIL61801 United States The Barcelona Institute of Science and Technology Campus UAB Barcelona08193 Spain Center for Cos

strongly lensed quadruply imaged quasars (quads) are extraordinary ob.e.ts. They are very rare in the sky - only a few tens are known to date - and yet they provide unique information about a wide range of topics, including the expansion history and the composition of the Universe, the distribution of stars and dark matter in galaxies, the host galaxies of quasars, and the stellar initial mass function. Finding them in astronomical images is a classic "needle in a haystack" prob.e., as they are outnumbered by other (contaminant) sources by many orders of magnitude. To solve this prob.e., we develop state-of-the-art deep learning methods and train them on realistic simulated quads based on real images of galaxies taken from the Dark energy survey, with realistic source and deflector models, including the chromatic effects of microlensing. The performance of the best methods on a mixture of simulated and real ob.e.ts is excellent, yielding area under the receiver operating curve in the range 0.86 to 0.89. Recall is close to 100% down to total magnitude i ∼ 21 indicating high completeness, while precision declines from 85% to 70% in the range i ∼ 17 - 21. The methods are extremely fast: training on 2 million samples takes 20 hours on a GPU machine, and 108 multi-band cutouts can be evaluated per GPU-hour. The speed and performance of the method pave the way to apply it to large samples of astronomical sources, bypassing the need for photometric pre-selection that is likely to be a major cause of incompleteness in current samples of known quads. © 2021, CC bY.

关键词： Galaxies

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Hard color-singlet exchange in dijet events in proton-proton collisions at s=13 TeV

引用

Physical Review D 2021年第3期104卷 032009-032009页

作者： A. M. sirunyan A. Tumasyan W. Adam F. Ambrogi T. bergauer M. Dragicevic J. erö A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko T. Madlener I. Mikulec F. M. Pitters N. Rad J. schieck R. schöfbeck M. spanring s. Templ W. Waltenberger C.-e. Wulz M. Zarucki V. Chekhovsky A. Litomin V. Makarenko J. suarez Gonzalez M. R. Darwish e. A. De Wolf D. Di Croce X. Janssen T. Kello A. Lelek M. Pieters H. Rejeb sfar H. Van Haevermaet P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols s. s. Chhibra J. D’Hondt J. De Clercq D. Lontkovskyi s. Lowette I. Marchesini s. Moortgat A. Morton Q. Python s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker H. Delannoy b. Dorney L. Favart A. Grebenyuk A. K. Kalsi I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.e. T. Cornelis D. Dobur M. Gruchala I. Khvastunov M. Niedziela C. Roskas K. skovpen M. Tytgat W. Verbeke b. Vermassen M. Vit G. bruno F. bury C. Caputo P. David C. Delaere M. Delcourt I. s. Donertas A. Giammanco V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn P. Vischia s. Wuyckens J. Zobec G. A. Alves G. Correia silva C. Hensel A. Moraes W. L. Aldá Júnior e. belchior batista Das Chagas H. brandao Malbouisson W. Carvalho J. Chinellato e. Coelho e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza J. Martins D. Matos Figueiredo M. Medina Jaime M. Melo De Almeida C. Mora Herrera L. Mundim H. Nogima P. Rebello Teles L. J. sanchez Rosas A. santoro s. M. silva Do Amaral A. sznajder M. Thiel e. J. Tonelli Manganote F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov M. bonchev A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov W. Fang Q. Guo H. Wang L. Yuan M. Ahmad Z. Hu Y. Wang e. 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 University of Illinois at Chicago (UIC) Chicago Illinois USA Department of Physics Tsinghua University Beijing China University of Virginia Charlottesville Virginia USA Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai 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 Egypt Center for High Energy Physic

events where the two leading jets are separated by a pseudorapidity interval devoid of particle activity, known as jet-gap-jet events, are studied in proton-proton collisions at s=13 TeV. The signature is expected from hard color-singlet exchange. each of the highest transverse momentum (pT) jets must have pTjet>40 GeV and pseudorapidity 1.4<|ηjet|<4.7, with ηjet1ηjet2<0, where jet1 and jet2 are the leading and sub.e.ding jets in pT, respectively. The analysis is based on data collected by the CMs and TOTeM experiments during a low luminosity, high-β* run at the CeRN LHC in 2015, with an integrated luminosity of 0.66 pb−1. events with a low number of charged particles with pT>0.2 GeV in the interval |η|<1 between the jets are ob.e.ved in excess of calculations that assume only color-exchange. The fraction of events produced via color-singlet exchange, fCse, is measured as a function of pTjet2, the pseudorapidity difference between the two leading jets, and the azimuthal angular separation between the two leading jets. The fraction fCse has values of 0.4–1.0%. The results are compared with previous measurements and with predictions from perturbative quantum chromodynamics. In addition, the first study of jet-gap-jet events detected in association with an intact proton using a subsample of events with an integrated luminosity of 0.40 pb−1 is presented. The intact protons are detected with the Roman pot detectors of the TOTeM experiment. The fCse in this sample is 2.91±0.70(stat)−1.01+1.08(syst) times larger than that for inclusive dijet production in dijets with similar kinematics.

关键词： Quark & gluon jets Hadron colliders

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Measurement of differential tt¯ production cross sections in the full kinematic range using lepton+jets events from proton-proton collisions at s=13 TeV

引用

Physical Review D 2021年第9期104卷 092013-092013页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. bergauer s. Chatterjee M. Dragicevic A. escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec P. Paulitsch F. M. Pitters J. schieck R. schöfbeck M. spanring s. Templ W. Waltenberger C.-e. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish e. A. De Wolf T. Janssen T. Kello A. Lelek H. Rejeb sfar P. Van Mechelen s. Van Putte N. Van Remortel F. b.e.man e. s. bols J. D’Hondt M. Delcourt H. el Faham s. Lowette s. Moortgat A. Morton D. Müller A. R. sahasransu s. Tavernier W. Van Doninck P. Van Mulders D. beghin b. bilin b. Clerbaux G. De Lentdecker L. Favart A. Grebenyuk A. K. Kalsi K. Lee M. Mahdavikhorrami I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau e. starling L. Thomas M. Vanden bemden C. Vander Velde P. Vanlaer D. Vannerom L. Wezenb.e. T. Cornelis D. Dobur J. Knolle L. Lamb.e.ht G. Mestdach M. Niedziela C. Roskas A. samalan K. skovpen M. Tytgat b. Vermassen M. Vit A. bethani G. bruno F. bury C. Caputo P. David C. Delaere I. s. Donertas A. Giammanco K. Jaffel sa. Jain V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn T. T. Tran P. Vischia s. Wertz G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior M. Alves Gallo Pereira M. barroso Ferreira Filho H. brandao Malbouisson W. Carvalho J. Chinellato e. M. Da Costa G. G. Da silveira D. De Jesus Damiao s. Fonseca De souza D. Matos Figueiredo C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima P. Rebello Teles A. santoro s. M. silva Do Amaral A. sznajder M. Thiel F. Torres Da silva De Araujo A. Vilela Pereira C. A. bernardes L. Calligaris T. R. Fernandez Perez Tomei e. M. Gregores D. s. Lemos P. G. Mercadante s. F. Novaes sandra s. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. shopova G. sultanov A. Dimitrov T. Ivanov L. Litov b. Pavlov P. Petkov A. Petrov T. Cheng Q. Guo T. Javaid M. Mittal H. Wang L. Yuan M. Ahmad G. bauer C. Dozen Z. Hu J. Martins Y. Wang K. Yi e. Chapon G. M. Chen H. s. Chen M. Chen F. Iemmi A. Kapoor D. Leggat H. Lia Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea 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 Rutgers The State University of New Jersey Piscataway New Jersey USA Department of Physics Tsinghua University Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai 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 Egypt Center for High Energy Physics (CHEP-FU) Fayoum Universit

Measurements of differential and doub.e.differential cross sections of top-quark pair (tt¯) production are presented in the lepton+jets channels with a single electron or muon and jets in the final state. The analysis combines for the first time signatures of top quarks with low transverse momentum pT, where the top-quark decay products can be identified as separated jets and isolated leptons, and with high pT, where the decay products are collimated and overlap. The measurements are based on proton-proton collision data at s=13 TeV collected by the CMs experiment at the LHC, corresponding to an integrated luminosity of 137 fb−1. The cross sections are presented at the parton and particle levels, where the latter minimizes extrapolations based on theoretical assumptions. Most of the measured differential cross sections are well described by standard model predictions with the exception of some doub.e.differential distributions. The inclusive tt¯ production cross section is measured to be σtt¯=791±25 pb, which constitutes the most precise measurement in the lepton+jets channel to date.

关键词： Particle production Top quark Hadron colliders

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