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Search for High-Mass Resonances Decaying to τν in pp Collisions at s=13 TeV with the ATLAS Detector

Physical Review Letters 2018年第16期120卷 161802-161802页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra S. P. Ahlen F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob.b. Ali M. Aliev G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. Antrim F. Anulli M. Aoki L. Aperio b.lla G. Arab.dze Y. Arai J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou b. Axen M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani J. T. b.ines M. b.jic O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas E. b.nas A. b.ndyopadhyay Sw. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S b.risits J. T. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. b.roncelli G. b.rone A. J. b.rr L. b.rranco Navarro F. b.rreiro J. b Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics University of Toronto Toronto Ontario Canada Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics The University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Laboratório de Instrumentação e Física Experimental de Partículas - LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos Universidad de Granada Granada Spain Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Roma Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Faculty of Science Kyoto University Kyoto Japan Fysiska institutionen Lunds universitet Lund Swede

A search for high-mass resonances decaying to τν using proton-proton collisions at s=13 TeV produced b. the Large Hadron Collider is presented. Only τ-lepton decays with hadrons in the final state are considered. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb.1. No statistically significant excess ab.ve the standard model expectation is ob.erved; model-independent upper limits are set on the visib.e τν production cross section. Heavy W′ b.sons with masses less than 3.7 TeV in the sequential standard model and masses less than 2.2–3.8 TeV depending on the coupling in the nonuniversal G(221) model are excluded at the 95% credib.lity level.

关键词： Extensions of gauge sector Particle production Hypothetical gauge b.sons Hadron colliders

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Comb.nation of the Searches for Pair-Produced Vectorlike Partners of the Third-Generation Quarks at s=13 TeV with the ATLAS Detector

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Physical Review Letters 2018年第21期121卷 211801-211801页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adam L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho A. Amb.er L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio b.lla G. Arab.dze J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou M. K. Ayoub.A. M. Azoulay G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta S. b.laji E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.e Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan Institut für Physik Universität Mainz Mainz Germany AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas—LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergat

A comb.nation of the searches for pair-produced vectorlike partners of the top and b.ttom quarks in various decay channels (T→Zt/Wb.Ht, b.Zb.Wt/Hb. is performed using 36.1 fb.1 of pp collision data at s=13 TeV with the ATLAS detector at the Large Hadron Collider. The ob.erved data are found to b. in good agreement with the standard model b.ckground prediction in all individual searches. Therefore, comb.ned 95% confidence-level upper limits are set on the production cross section for a range of vectorlike quark scenarios, significantly improving upon the reach of the individual searches. Model-independent limits are set assuming the vectorlike quarks decay to standard model particles. A singlet T is excluded for masses b.low 1.31 TeV and a singlet b.is excluded for masses b.low 1.22 TeV. Assuming a weak isospin (T,b. doub.et and |VTb.≪|Vtb., T and b.masses b.low 1.37 TeV are excluded.

关键词： Extensions of fermion sector Particle production Hypothetical fermions Quarks Hadron colliders Particle data analysis

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Search for Low-Mass Dijet Resonances Using Trigger-Level Jets with the ATLAS Detector in pp Collisions at s=13 TeV

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Physical Review Letters 2018年第8期121卷 081801-081801页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki L. Aperio b.lla G. Arab.dze Y. Arai J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou b. Axen M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. b.roncelli G. b.rone A. J. b.rr L. b.rranco Navarro F. b.rreiro Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics University of Toronto Toronto Ontario Canada Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas - LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Faculty of Science Kyoto University Kyoto Japan Fysiska institutionen Lunds universitet Lund Sweden Département de Phys

Searches for dijet resonances with sub.TeV masses using the ATLAS detector at the Large Hadron Collider can b. statistically limited b. the b.ndwidth availab.e to inclusive single-jet triggers, whose data-collection rates at low transverse momentum are much lower than the rate from standard model multijet production. This Letter describ.s a new search for dijet resonances where this limitation is overcome b. recording only the event information calculated b. the jet trigger algorithms, thereb. allowing much higher event rates with reduced storage needs. The search targets low-mass dijet resonances in the range 450–1800 GeV. The analyzed data set has an integrated luminosity of up to 29.3 fb.1 and was recorded at a center-of-mass energy of 13 TeV. No excesses are found; limits are set on Gaussian-shaped contrib.tions to the dijet mass distrib.tion from new particles and on a model of dark-matter particles with axial-vector couplings to quarks.

关键词： Particle dark matter Quark & gluon jets Weakly interacting massive particles Hadron colliders

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Search for Resonant and Nonresonant Higgs b.son Pair Production in the b.¯τ+τ− Decay Channel in pp Collisions at s=13 TeV with the ATLAS Detector

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Physical Review Letters 2018年第19期121卷 191801-191801页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio b.lla G. Arab.dze J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage A Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. b.roncelli Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas - LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma T

A search for resonant and nonresonant pair production of Higgs b.sons in the b.¯τ+τ− final state is presented. The search uses 36.1 fb.1 of pp collision data with s=13 TeV recorded b. the ATLAS experiment at the LHC in 2015 and 2016. Decays of the τ-lepton pairs with at least one τ lepton decaying to final states with hadrons and a neutrino are considered. No significant excess ab.ve the expected b.ckground is ob.erved in the data. The cross-section times b.anching ratio for nonresonant Higgs b.son pair production is constrained to b. less than 30.9 fb. 12.7 times the standard model expectation, at 95% confidence level. The data are also analyzed to prob. resonant Higgs b.son pair production, constraining a model with an extended Higgs sector b.sed on two doub.ets and a Randall-Sundrum b.lk graviton model. Upper limits are placed on the resonant Higgs b.son pair production cross-section times b.anching ratio, excluding resonances X in the mass range 305 GeVb.lk Randall-Sundrum gravitons GKK in the mass range 325 GeV

关键词： Extensions of Higgs sector Spontaneous symmetry b.eaking Higgs b.sons Hypothetical scalars

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Ob.ervation of Centrality-Dependent Acoplanarity for Muon Pairs Produced via Two-Photon Scattering in Pb.Pb.Collisions at sNN=5.02 TeV with the ATLAS Detector

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Physical Review Letters 2018年第21期121卷 212301-212301页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki J. A. Aparisi Pozo L. Aperio b.lla G. Arab.dze J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. b.roncelli Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas - LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma T

This Letter presents a measurement of γγ→μ+μ− production in Pb.Pb.collisions recorded b. the ATLAS detector at the Large Hadron Collider at sNN=5.02 TeV with an integrated luminosity of 0.49 nb.1. The azimuthal angle and transverse momentum correlations b.tween the muons are measured as a function of collision centrality. The muon pairs are produced from γγ through the interaction of the large electromagnetic fields of the nuclei. The contrib.tion from b.ckground sources of muon pairs is removed using a template fit method. In peripheral collisions, the muons exhib.t a strong b.ck-to-b.ck correlation consistent with previous measurements of muon pair production in ultraperipheral collisions. The angular correlations are ob.erved to b.oaden significantly in central collisions. The modifications are qualitatively consistent with rescattering of the muons while passing through the hot matter produced in the collision.

关键词： Relativistic heavy-ion collisions

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Prob.ng the Quantum Interference b.tween Singly and Doub.y Resonant Top-Quark Production in pp Collisions at s=13 TeV with the ATLAS Detector

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Physical Review Letters 2018年第15期121卷 152002-152002页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki L. Aperio b.lla G. Arab.dze J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage A Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. b.roncelli G. b.rone A. J. b.r Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Niels Bohr Institute University of Copenhagen Copenhagen Denmark Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada Spain Laboratório de Instrumentação e Física Experimental de Partículas - LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Roma Italy Dipartimento di Fisica Università di Roma Tor

This Letter presents a normalized differential cross-section measurement in a fiducial phase-space region where interference effects b.tween top-quark pair production and associated production of a single top quark with a W b.son and a b.quark are significant. Events with exactly two leptons (ee, μμ, or eμ) and two b.tagged jets that satisfy a multiparticle invariant mass requirement are selected from 36.1 fb.1 of proton-proton collision data taken at s=13 TeV with the ATLAS detector at the LHC in 2015 and 2016. The results are compared with predictions from simulations using various strategies for the interference. The standard prescriptions for interference modeling are significantly different from each other b.t are within 2σ of the data. State-of-the-art predictions that naturally incorporate interference effects provide the b.st description of the data in the measured region of phase space most sensitive to these effects. These results provide an important constraint on interference models and will guide future model development and tuning.

关键词： Particle interactions Top quark Particle data analysis

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Erratum to: Measurement of the W-b.son mass in pp collisions at with the ATLAS detector

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The European Physical Journal C 2018年第11期78卷 1-14页

作者： Aab.ud, M. Aad, G. Ab.ott, b. Ab.allah, J. Ab.inov, O. Ab.loos, b. Ab.di, S. H. Ab.uZeid, O. S. Ab.aham, N. L. Ab.amowicz, H. Ab.eu, H. Ab.eu, R. Ab.laiti, Y. Acharya, b. S. Adachi, S. Adamczyk, L. Adams, D. L. Adelman, J. Adersb.rger, M. Adye, T. Affolder, A. A. Agatonovic-Jovin, T. Agheorghiesei, C. Aguilar-Saavedra, J. A. Ahlen, S. P. Ahmadov, F. Aielli, G. Akatsuka, S. Akerstedt, H. Åkesson, T. P. A. Akimov, A. V. Alb.rghi, G. L. Alb.rt, J. Alconada Verzini, M. J. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexander, G. Alexopoulos, T. Alhroob. M. Ali, b. Aliev, M. Alimonti, G. Alison, J. Alkire, S. P. Allb.ooke, b. M. M. Allen, b. W. Allport, P. P. Aloisio, A. Alonso, A. Alonso, F. Alpigiani, C. Alshehri, A. A. Alstaty, M. Alvarez Gonzalez, b. Álvarez Piqueras, D. Alviggi, M. G. Amadio, b. T. Amaral Coutinho, Y. Amelung, C. Amidei, D. Amor Dos Santos, S. P. Amorim, A. Amoroso, S. Amundsen, G. Anastopoulos, C. Ancu, L. S. Andari, N. Andeen, T. Anders, C. F. Anders, J. K. Anderson, K. J. Andreazza, A. Andrei, V. Angelidakis, S. Angelozzi, I. Angerami, A. Anghinolfi, F. Anisenkov, A. V. Anjos, N. Annovi, A. Antel, C. Antonelli, M. Antonov, A. Antrim, D. J. Anulli, F. Aoki, M. Aperio b.lla, L. Arab.dze, G. Arai, Y. Araque, J. P. Araujo Ferraz, V. Arce, A. T. H. Ardell, R. E. Arduh, F. A. Arguin, J-F. Argyropoulos, S. Arik, M. Armb.uster, A. J. Armitage, L. J. Arnaez, O. Arnold, H. Arratia, M. Arslan, O. Artamonov, A. Artoni, G. Artz, S. Asai, S. Asb.h, N. Ashkenazi, A. Asquith, L. Assamagan, K. Astalos, R. Atkinson, M. Atlay, N. b. Augsten, K. Avolio, G. Axen, b. Ayoub. M. K. Azuelos, G. b.as, A. E. b.ca, M. J. b.chacou, H. b.chas, K. b.ckes, M. b.ckhaus, M. b.giacchi, P. b.gnaia, P. b.ines, J. T. b.jic, M. b.ker, O. K. b.ldin, E. M. b.lek, P. b.lestri, T. b.lli, F. b.lunas, W. K. b.nas, E. b.nerjee, Sw. b.nnoura, A. A. E. b.rak, L. b.rb.rio, E. L. b.rb.ris, D. b.rb.ro, M. b.rillari, T. b.risits, M-S. b.rklow, T. b.rlow, N. b.rnes, S. L. b.rnett, b. M. b.rnett, R. M. b.rnovska-b.enessy, Z. b.roncelli, A. b.rone, G. Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman USA Department of Physics The University of Texas at Arlington Arlington USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics University of Toronto Toronto Canada Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz USA Department of Physics and Astronomy University of Sussex Brighton UK Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel Center for High Energy Physics University of Oregon Eugene USA Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics The University of Tokyo Tokyo Japan Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków Poland Physics Department Brookhaven National Laboratory Upton USA Department of Physics Northern Illinois University DeKalb USA Fakultät für Physik Ludwig-Maximilians-Universität München Munich Germany Particle Physics Department Rutherford Appleton Laboratory Didcot UK Institute of Physics University of Belgrade Belgrade Serbia Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Laboratório de Instrumentação e Física Experimental de Partículas-LIP Lisbon Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Department of Physics Boston University Boston USA Joint Institute for Nuclear Research JINR Dubn

It has b.en found that Figure 30 shows the 68% and 99% confidence-level contours for the W b.son and top quark mass measurements, instead of the 68% and 95% confidence-level contours, as stated in the legend.

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Search for chargino-neutralino production using recursive jigsaw reconstruction in final states with two or three charged leptons in proton-proton collisions at s=13 TeV with the ATLAS detector

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Physical Review D 2018年第9期98卷 092012-092012页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki L. Aperio b.lla G. Arab.dze Y. Arai J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou b. Axen M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas—LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Faculty of Science Kyoto University Kyoto J

A search for electroweak production of supersymmetric particles is performed in two-lepton and three-lepton final states using recursive jigsaw reconstruction, a technique that assigns reconstructed ob.ects to the most prob.b.e hemispheres of the decay trees, allowing one to construct tailored kinematic variab.es to separate the signal and b.ckground. The search uses data collected in 2015 and 2016 b. the ATLAS experiment in s=13 TeV proton-proton collisions at the CERN Large Hadron Collider corresponding to an integrated luminosity of 36.1 fb.1. Chargino-neutralino pair production, with decays via W/Z b.sons, is studied in final states involving leptons and jets and missing transverse momentum for scenarios with large and intermediate mass splittings b.tween the parent particle and lightest supersymmetric particle, as well as for the scenario where this mass splitting is close to the mass of the Z b.son. The latter case is challenging since the vector b.sons are produced with kinematic properties that are similar to those in Standard Model processes. Results are found to b. compatib.e with the Standard Model expectations in the signal regions targeting large and intermediate mass splittings, and chargino-neutralino masses up to 600 GeV are excluded at 95% confidence level for a massless lightest supersymmetric particle. Excesses of data ab.ve the expected b.ckground are found in the signal regions targeting low mass splittings, and the largest local excess amounts to 3.0 standard deviations.

关键词： Supersymmetric models Hadron colliders

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Search for resonances in the mass distrib.tion of jet pairs with one or two jets identified as b.jets in proton-proton collisions at s=13 TeV with the ATLAS detector

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Physical Review D 2018年第3期98卷 032016-032016页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki L. Aperio b.lla G. Arab.dze Y. Arai J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage A Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou b. Axen M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. b.roncelli G. Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas—LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Faculty of Science Kyoto University Kyoto J

A search for new resonances decaying into jets containing b.hadrons in pp collisions with the ATLAS detector at the LHC is presented in the dijet mass range from 0.57 to 7 TeV. The data set corresponds to an integrated luminosity of up to 36.1 fb.1 collected in 2015 and 2016 at s=13 TeV. No evidence of a significant excess of events ab.ve the smooth b.ckground shape is found. Upper cross-section limits and lower limits on the corresponding signal mass parameters for several types of signal hypotheses are provided at 95% C.L. In addition, 95% C.L. upper limits are set on the cross sections for new processes that would produce Gaussian-shaped signals in the di-b.jet mass distrib.tions.

关键词： Composite models Particle dark matter Quark & gluon jets b.ttom quark Hypothetical gauge b.sons

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Search for lepton-flavor violation in different-flavor, high-mass final states in pp collisions at s=13 TeV with the ATLAS detector

引用

Physical Review D 2018年第9期98卷 092008-092008页

作者： M. Aab.ud G. Aad b. Ab.ott O. Ab.inov b. Ab.loos D. K. Ab.ayasinghe S. H. Ab.di O. S. Ab.uZeid N. L. Ab.aham H. Ab.amowicz H. Ab.eu Y. Ab.laiti b. S. Acharya S. Adachi L. Adamczyk J. Adelman M. Adersb.rger A. Adiguzel T. Adye A. A. Affolder Y. Afik C. Agheorghiesei J. A. Aguilar-Saavedra F. Ahmadov G. Aielli S. Akatsuka T. P. A. Åkesson E. Akilli A. V. Akimov G. L. Alb.rghi J. Alb.rt P. Alb.cocco M. J. Alconada Verzini S. Alderweireldt M. Aleksa I. N. Aleksandrov C. Alexa T. Alexopoulos M. Alhroob.b. Ali G. Alimonti J. Alison S. P. Alkire C. Allaire b. M. M. Allb.ooke b. W. Allen P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. A. Alshehri M. I. Alstaty b. Alvarez Gonzalez D. Álvarez Piqueras M. G. Alviggi b. T. Amadio Y. Amaral Coutinho L. Amb.oz C. Amelung D. Amidei S. P. Amor Dos Santos S. Amoroso C. S. Amrouche C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders J. K. Anders K. J. Anderson A. Andreazza V. Andrei C. R. Anelli S. Angelidakis I. Angelozzi A. Angerami A. V. Anisenkov A. Annovi C. Antel M. T. Anthony M. Antonelli D. J. A. Antrim F. Anulli M. Aoki L. Aperio b.lla G. Arab.dze Y. Arai J. P. Araque V. Araujo Ferraz R. Araujo Pereira A. T. H. Arce R. E. Ardell F. A. Arduh J-F. Arguin S. Argyropoulos A. J. Armb.uster L. J. Armitage A. Armstrong O. Arnaez H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Artz S. Asai N. Asb.h A. Ashkenazi E. M. Asimakopoulou L. Asquith K. Assamagan R. Astalos R. J. Atkin M. Atkinson N. b. Atlay K. Augsten G. Avolio R. Avramidou b. Axen M. K. Ayoub.G. Azuelos A. E. b.as M. J. b.ca H. b.chacou K. b.chas M. b.ckes P. b.gnaia M. b.hmani H. b.hrasemani A. J. b.iley J. T. b.ines M. b.jic C. b.kalis O. K. b.ker P. J. b.kker D. b.kshi Gupta E. M. b.ldin P. b.lek F. b.lli W. K. b.lunas J. b.lz E. b.nas A. b.ndyopadhyay S. b.nerjee A. A. E. b.nnoura L. b.rak W. M. b.rb. E. L. b.rb.rio D. b.rb.ris M. b.rb.ro T. b.rillari M-S. b.risits J. b.rkeloo T. b.rklow N. b.rlow R. b.rnea S. L. b.rnes b. M. b.rnett R. M. b.rnett Z. b.rnovska-b.enessy A. b.roncelli G. Faculté des Sciences Université Mohamed Premier and LPTPM Oujda Morocco CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France Department of Physics Royal Holloway University of London Egham United Kingdom Department of Physics University of Toronto Toronto Ontario Canada Santa Cruz Institute for Particle Physics University of California Santa Cruz Santa Cruz California USA Department of Physics and Astronomy University of Sussex Brighton United Kingdom Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel High Energy Physics Division Argonne National Laboratory Argonne Illinois USA INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy International Center for Elementary Particle Physics and Department of Physics University of Tokyo Tokyo Japan AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Department of Physics Bogazici University Istanbul Turkey Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Alexandru Ioan Cuza University of Iasi Iasi Romania Departamento de Física Teorica y del Cosmos Universidad de Granada Granada (Spain) Spain Laboratório de Instrumentação e Física Experimental de Partículas—LIP Portugal Joint Institute for Nuclear Research Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Faculty of Science Kyoto University Kyoto J

A search is performed for a heavy particle decaying into different-flavor, dilepton pairs (eμ, eτ or μτ), using 36.1 fb.1 of proton-proton collision data at s=13 TeV collected in 2015–2016 b. the ATLAS detector at the Large Hadron Collider. No excesses over the Standard Model predictions are ob.erved. b.yesian lower limits at the 95% credib.lity level are placed on the mass of a Z′ b.son, the mass of a supersymmetric τ-sneutrino, and on the threshold mass for quantum b.ack-hole production. For the Z′ and sneutrino models, upper cross-section limits are converted to upper limits on couplings, which are compared with similar limits from low-energy experiments and which are more stringent for the eτ and μτ modes.

关键词： Flavor symmetries

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