<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> Properties of Higgs Boson Interactions with Top Quarks in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mi>H</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mi>H</mml:mi></mml:math> Processes Using <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>H</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi></mml:math> with the ATLAS Detector
G. AadCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceB. AbbottHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman Oklahoma, USAD. C. AbbottDepartment of Physics, University of Massachusetts, Amherst, Massachusetts, USAA. Abed AbudCERN, Geneva, SwitzerlandKira AbelingII. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, GermanyD. K. AbhayasingheDepartment of Physics, Royal Holloway University of London, Egham, United KingdomHaider AbidiDepartment of Physics, University of Toronto, Toronto, Ontario, CanadaO. S. AbouZeidNiels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkN. L. AbrahamDepartment of Physics and Astronomy, University of Sussex, Brighton, United KingdomH. AbramowiczRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelH. AbreuDepartment of Physics, Technion, Israel Institute of Technology, Haifa, IsraelY. AbulaitiHigh Energy Physics Division, Argonne National Laboratory, Argonne, Illinois, USAB. S. AcharyaICTP, Trieste, ItalyB. AchkarII. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, GermanyL. AdámekInstitut für Physik, Universität Mainz, Mainz, GermanyClaire Adam BourdariosLAPP, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy, FranceL. AdamczykAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, PolandJahred AdelmanDepartment of Physics, Northern Illinois University, DeKalb, Illinois, USAM. AdersbergerFakultät für Physik, Ludwig-Maximilians-Universität München, München, GermanyAytul AdiguzelDepartment of Physics, Bogazici University, Istanbul, TurkeyS. AdorniDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, SwitzerlandTim AdyeParticle Physics Department, Rutherford Appleton Laboratory, Didcot, United KingdomTony AffolderSanta Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, California, USAY. AfikDepartment of Physics, Technion, Israel Institute of Technology, Haifa, IsraelC. AgapopoulouIJCLab, Université Paris-Saclay, CNRS/IN2P3, 91405, Orsay, FranceMerve Nazlim AgarasLPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, FranceAnamika AggarwalInstitute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, NetherlandsC. AgheorghieseiDepartment of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, RomaniaJ. A. Aguilar–SaavedraDepartamento de Física Teórica y del Cosmos, Universidad de Granada, Granada (Spain), SpainA. AhmadCERN, Geneva, SwitzerlandF. AhmadovJoint Institute for Nuclear Research, Dubna, RussiaW. S. AhmedDepartment of Physics, McGill University, Montreal, Quebec, CanadaX. AiPhysics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, California, USAGiulio AielliDipartimento di Fisica, Università di Roma Tor Vergata, Roma, ItalyS. AkatsukaFaculty of Science, Kyoto University, Kyoto, JapanMelike AkbiyikInstitut für Physik, Universität Mainz, Mainz, GermanyTorsten AkessonFysiska institutionen, Lunds universitet, Lund, SwedenE. AkilliDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, SwitzerlandA. V. AkimovP.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, RussiaK. Al KhouryIJCLab, Université Paris-Saclay, CNRS/IN2P3, 91405, Orsay, FranceGian Luigi AlberghiINFN Bologna and Universita' di Bologna, Dipartimento di Fisica, ItalyJ. AlbertDepartment of Physics and Astronomy, University of Victoria, Victoria, British Columbia, CanadaM. J. Alconada VerziniRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelSara AlderweireldtCERN, Geneva, SwitzerlandMartin AleksaCERN, Geneva, SwitzerlandI. N. AleksandrovJoint Institute for Nuclear Research, Dubna, RussiaC. AlexaHoria Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, RomaniaT. AlexopoulosPhysics Department, National Technical University of Athens, Zografou, GreeceA. AlfonsiNikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, NetherlandsF. AlfonsiINFN Bologna and Universita' di Bologna, Dipartimento di Fisica, ItalyMuhammad AlhroobHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman Oklahoma, USABabar AliCzech Technical University in Prague, Prague, Czech RepublicS. AliInstitute of Physics, Academia Sinica, Taipei, TaiwanM. AlievTomsk State University, Tomsk, RussiaGianluca AlimontiINFN Sezione di Milano, ItalyCorentin AllaireCERN, Geneva, SwitzerlandB. M. M. AllbrookeDepartment of Physics and Astronomy, University of Sussex, Brighton, United KingdomB. W. AllenInstitute for Fundamental Science, University of Oregon, Eugene, Oregon, USAPhilip Patrick AllportSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomA. AloisioDipartimento di Fisica, Università di Napoli, Napoli, ItalyF. AlonsoInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaCristiano AlpigianiDepartment of Physics, University of Washington, Seattle, Washington, USAE. Alunno CameliaDipartimento di Fisica, Università di Roma Tor Vergata, Roma, ItalyM. Alvarez EstevezDepartamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, SpainM. G. AlviggiDipartimento di Fisica, Università di Napoli, Napoli, ItalyY. Amaral CoutinhoUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilAlessandro AmblerDepartment of Physics, McGill University, Montreal, Quebec, CanadaL AmbrozDepartment of Physics, Oxford University, Oxford, United KingdomChristoph AmelungDepartment of Physics, Brandeis University, Waltham, Massachusetts, USAD. AmideiDepartment of Physics, University of Michigan, Ann Arbor, Michigan, USAS. P. Amor Dos SantosLaboratório de Instrumentação e Física Experimental de Partículas-LIP, Lisboa, PortugalS. AmorosoDeutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, GermanyC. S. AmroucheDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, SwitzerlandF. F. AnDepartment of Physics and Astronomy, Iowa State University, Ames, Iowa, USAChristos AnastopoulosDepartment of Physics and Astronomy, University of Sheffield, Sheffield, United KingdomN. AndariIRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, FranceT. AndeenDepartment of Physics, University of Texas at Austin, Austin, Texas, USAJohn Kenneth AndersAlbert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, SwitzerlandS. Y. AndreanDepartment of Physics, Stockholm University, SwedenA. AndreazzaDipartimento di Fisica, Università di Milano, Milano, ItalyV. AndreiKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyC. R. AnelliDepartment of Physics and Astronomy, University of Victoria, Victoria, British Columbia, CanadaS. AngelidakisPhysics Department, National and Kapodistrian University of Athens, Athens, GreeceAaron AngeramiNevis Laboratory, Columbia University, Irvington, New York, USAAlexey AnisenkovBudker Institute of Nuclear Physics and NSU, SB RAS, Novosibirsk, RussiaA. AnnoviINFN Sezione di Pisa, ItalyC. AntelDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, SwitzerlandM. T. AnthonyDepartment of Physics and Astronomy, University of Sheffield, Sheffield, United KingdomE. AntipovDepartment of Physics, Oklahoma State University, Stillwater, Oklahoma, USAM. AntonelliINFN e Laboratori Nazionali di Frascati, Frascati, ItalyD. J. A. AntrimDepartment of Physics and Astronomy, University of California Irvine, Irvine, California, USAF. AnulliINFN Sezione di Roma, ItalyMasato AokiKEK, High Energy Accelerator Research Organization, Tsukuba, JapanJ. A. Aparisi PozoInstituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia-CSIC, Valencia, SpainM. A. AparoDepartment of Physics and Astronomy, University of Sussex, Brighton, United KingdomL. Aperio BellaDeutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, GermanyN. AranzabalCERN, Geneva, SwitzerlandV. Araujo FerrazDepartamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, BrazilR. Araujo PereiraUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
2020lv
ABI
Аннотация
A study of the charge conjugation and parity ($CP$) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel ($H\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$), and their production in association with a top quark pair ($t\overline{t}H$) or single top quark ($tH$) is studied. The analysis uses $139\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of proton--proton collision data recorded at a center-of-mass energy of $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ with the ATLAS detector at the Large Hadron Collider. Assuming a $CP$-even coupling, the $t\overline{t}H$ process is observed with a significance of 5.2 standard deviations. The measured cross section times $H\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ branching ratio is ${1.64}_{\ensuremath{-}0.36}^{+0.38}(\text{stat}{)}_{\ensuremath{-}0.14}^{+0.17}(\text{sys})\text{ }\text{ }\mathrm{fb}$, and the measured rate for $t\overline{t}H$ is ${1.43}_{\ensuremath{-}0.31}^{+0.33}(\text{stat}{)}_{\ensuremath{-}0.15}^{+0.21}(\text{sys})$ times the Standard Model expectation. The $tH$ production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A $CP$-mixing angle greater (less) than 43 $(\ensuremath{-}43)\ifmmode^\circ\else\textdegree\fi{}$ is excluded at 95% confidence level.
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