Measurements of differential cross-sections in top-quark pair events with a high transverse momentum top quark and limits on beyond the Standard Model contributions to top-quark pair production with the ATLAS detector at $$ \sqrt{s} $$ = 13 TeV
G. AadCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceB. AbbottDepartment of Physics, University of Massachusetts, Amherst, MA, United States of AmericaD. C. AbbottDepartment of Physics, University of Massachusetts, Amherst, MA, United States of AmericaA. 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 AbidiPhysics Department, Brookhaven National Laboratory, Upton, NY, United States of AmericaAsmaa AboulhormaFaculté des sciences, Université Mohammed V, Rabat, MoroccoH. 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. AbulaitiDepartment of Physics, New York University, New York, NY, United States of AmericaA. C. Abusleme HoffmanDepartamento de Física, Pontificia Universidad Católica de Chile, Santiago, ChileB. S. AcharyaINFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, ItalyB. AchkarII. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, GermanyL. AdámekPhysics Department, Brookhaven National Laboratory, Upton, NY, United States of AmericaClaire Adam BourdariosLAPP, Univ. Savoie Mont Blanc, CNRS/IN2P3, Annecy, FranceL. AdamczykAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, PolandS. V. AddepalliDepartment of Physics, Brandeis University, Waltham, MA, United States of AmericaJahred AdelmanDepartment of Physics, Northern Illinois University, DeKalb, IL, United States of AmericaA. AdiguzelDepartment of Physics, Istanbul 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, CA, United States of AmericaY. AfikCERN, Geneva, SwitzerlandMerve Nazlim AgarasInstitut de Física d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, SpainJ. AgarwalaINFN Sezione di Pavia, Pavia, ItalyAnamika AggarwalInstitut für Physik, Universität Mainz, Mainz, GermanyC. AgheorghieseiDepartment of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, RomaniaJ. A. Aguilar–SaavedraLaboratório de Instrumentação e Física Experimental de Partículas – LIP, Lisboa, PortugalA. AhmadCERN, Geneva, SwitzerlandF. AhmadovJoint Institute for Nuclear Research, Dubna, RussiaW. S. AhmedDepartment of Physics, McGill University, Montreal, QC, CanadaX. AiDeutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, GermanyGiulio AielliINFN Sezione di Roma Tor Vergata, Roma, ItalyIgor AizenbergDepartment of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, IsraelMelike AkbiyikInstitut für Physik, Universität Mainz, Mainz, GermanyTorsten AkessonFysiska institutionen, Lunds universitet, Lund, SwedenAndrei AkimovP.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, RussiaK. Al KhouryNevis Laboratory, Columbia University, Irvington, NY, United States of AmericaGian Luigi AlberghiINFN Sezione di Bologna, Bologna, ItalyJ. AlbertDepartment of Physics and Astronomy, University of Victoria, Victoria, BC, CanadaP. AlbicoccoINFN e Laboratori Nazionali di Frascati, Frascati, ItalyM. J. Alconada VerziniInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaSara AlderweireldtSUPA - School of Physics and Astronomy, University of Edinburgh, Edinburgh, United KingdomM. 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. AlfonsiINFN Sezione di Bologna, Bologna, ItalyF. AlfonsiINFN Sezione di Bologna, Bologna, ItalyMuhammad AlhroobHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, United States of AmericaBabar AliPhysics Department, National Technical University of Athens, Zografou, GreeceS. AliPhysics Department, National Technical University of Athens, Zografou, GreeceM. AlievTomsk State University, Tomsk, RussiaGianluca AlimontiINFN Sezione di Milano, Milano, ItalyC. AllaireCERN, Geneva, SwitzerlandBenedict AllbrookeDepartment of Physics and Astronomy, University of Sussex, Brighton, United KingdomPhilip Patrick AllportSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomA. AloisioINFN Sezione 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, WA, United States of AmericaElio Alunno CameliaINFN Sezione di Roma Tor Vergata, Roma, ItalyM. Alvarez EstevezDepartamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, SpainM. G. AlviggiINFN Sezione di Napoli, Napoli, ItalyY. Amaral CoutinhoUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilAlessandro AmblerDepartment of Physics, McGill University, Montreal, QC, CanadaL. AmbrozDepartment of Physics, Oxford University, Oxford, United KingdomC. AmelungCERN, Geneva, SwitzerlandD. AmideiDepartment of Physics, University of Michigan, Ann Arbor, MI, United States of AmericaS. P. Amor Dos SantosLaboratório de Instrumentação e Física Experimental de Partículas – LIP, Lisboa, PortugalS. AmorosoDeutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, GermanyK. R. AmosInstituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia – CSIC, Valencia, SpainCherifa Sabrina AmroucheDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, SwitzerlandV. AnanievDepartment of Physics, University of Oslo, Oslo, NorwayChristos 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, TX, United States of AmericaJohn Kenneth AndersAlbert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, SwitzerlandS. Y. AndreanDepartment of Physics, Stockholm University, Stockholm, SwedenA. AndreazzaINFN Sezione di Milano, Milano, ItalyStylianos AngelidakisPhysics Department, National and Kapodistrian University of Athens, Athens, GreeceAaron AngeramiNevis Laboratory, Columbia University, Irvington, NY, United States of AmericaAlexey AnisenkovBudker Institute of Nuclear Physics and NSU, SB RAS, Novosibirsk, RussiaA. AnnoviINFN Sezione di Pisa, 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, OK, United States of AmericaM. AntonelliINFN e Laboratori Nazionali di Frascati, Frascati, ItalyD. J. A. AntrimPhysics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, United States of AmericaFabio AnulliINFN Sezione di Roma, 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, GermanyC. AppeltInstitut für Physik, Humboldt Universität zu Berlin, Berlin, GermanyN. AranzabalCERN, Geneva, SwitzerlandV. Araujo FerrazDepartamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, BrazilC. ArcangelettiINFN e Laboratori Nazionali di Frascati, Frascati, ItalyA. T. H. ArceDepartment of Physics, Duke University, Durham, NC, United States of America
2022en
ABI
Annotatsiya
A bstract Cross-section measurements of top-quark pair production where the hadronically decaying top quark has transverse momentum greater than 355 GeV and the other top quark decays into ℓνb are presented using 139 fb − 1 of data collected by the ATLAS experiment during proton-proton collisions at the LHC. The fiducial cross-section at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV is measured to be σ = 1 . 267 ± 0 . 005 ± 0 . 053 pb, where the uncertainties reflect the limited number of data events and the systematic uncertainties, giving a total uncertainty of 4 . 2%. The cross-section is measured differentially as a function of variables characterising the $$ t\overline{t} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> system and additional radiation in the events. The results are compared with various Monte Carlo generators, including comparisons where the generators are reweighted to match a parton-level calculation at next-to-next-to-leading order. The reweighting improves the agreement between data and theory. The measured distribution of the top-quark transverse momentum is used to search for new physics in the context of the effective field theory framework. No significant deviation from the Standard Model is observed and limits are set on the Wilson coefficients of the dimension-six operators O tG and $$ {O}_{tq}^{(8)} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>O</mml:mi> <mml:mi>tq</mml:mi> <mml:mfenced> <mml:mn>8</mml:mn> </mml:mfenced> </mml:msubsup> </mml:math> , where the limits on the latter are the most stringent to date.
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