Maqola

Measurement of the $$t\bar{t}$$ production cross-section and lepton differential distributions in $$e\mu $$ dilepton events from pp collisions at $$\sqrt{s}=13\,\text {TeV}$$ with the ATLAS detector

G. AadCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceB. AbbottDepartment of Physics, University of Massachusetts, Amherst, USAD. C. AbbottDepartment of Physics, University of Massachusetts, Amherst, USAA. Abed AbudINFN Sezione di Pavia, Pavia, ItalyKira AbelingII. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, GermanyD. K. AbhayasingheDepartment of Physics, Royal Holloway University of London, Egham, UKHaider AbidiDepartment of Physics, University of Toronto, Toronto, CanadaO. S. AbouZeidNiels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkN. L. AbrahamDepartment of Physics and Astronomy, University of Sussex, Brighton, UKH. 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, USAB. S. AcharyaICTP, Trieste, ItalyB. AchkarII. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, GermanyS. AdachiInternational Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, JapanL. 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, Kraków, PolandJahred AdelmanDepartment of Physics, Northern Illinois University, DeKalb, USAM. AdersbergerFakultät für Physik, Ludwig-Maximilians-Universität München, Munich, GermanyAytul AdiguzelDepartment of Physics, Bogazici University, Istanbul, TurkeyS. AdorniDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, SwitzerlandTim AdyeParticle Physics Department, Rutherford Appleton Laboratory, Didcot, UKTony AffolderSanta Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, USAY. AfikDepartment of Physics, Technion, Israel Institute of Technology, Haifa, IsraelC. AgapopoulouIJCLab, Université Paris-Saclay, CNRS/IN2P3, Orsay, FranceMerve Nazlim AgarasLPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, FranceAnamika AggarwalInstitute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, The 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, SpainF. AhmadovJoint Institute for Nuclear Research, Dubna, RussiaW. S. AhmedDepartment of Physics, McGill University, Montreal, CanadaX. AiPhysics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, USAGiulio AielliDipartimento di Fisica, Università di Roma Tor Vergata, Rome, ItalyS. AkatsukaFaculty of Science, Kyoto University, Kyoto, JapanTorsten AkessonFysiska institutionen, Lunds universitet, Lund, SwedenE. AkilliDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, SwitzerlandAndrei AkimovP.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, RussiaK. Al KhouryIJCLab, Université Paris-Saclay, CNRS/IN2P3, Orsay, FranceGian Luigi AlberghiDipartimento di Fisica, INFN Bologna and Universita’ di Bologna, Bologna, ItalyJ. AlbertDepartment of Physics and Astronomy, University of Victoria, Victoria, CanadaM. J. Alconada VerziniRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelSara AlderweireldtCERN, Geneva, SwitzerlandM. 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. AlfonsiDipartimento di Fisica, INFN Bologna and Universita’ di Bologna, Bologna, ItalyMuhammad AlhroobHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, USABabar AliCzech Technical University in Prague, Prague, Czech RepublicM. AlievTomsk State University, Tomsk, RussiaGianluca AlimontiINFN Sezione di Milano, Milan, ItalyS. P. AlkireDepartment of Physics, University of Washington, Seattle, USACorentin AllaireIJCLab, Université Paris-Saclay, CNRS/IN2P3, Orsay, FranceBenedict AllbrookeDepartment of Physics and Astronomy, University of Sussex, Brighton, UKB. W. AllenCenter for High Energy Physics, University of Oregon, Eugene, USAPhilip Patrick AllportSchool of Physics and Astronomy, University of Birmingham, Birmingham, UKA. AloisioDipartimento di Fisica, Università di Napoli, Naples, ItalyA. AlonsoInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaF. AlonsoInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaCristiano AlpigianiDepartment of Physics, University of Washington, Seattle, USAA. A. AlshehriSUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, UKM. Alvarez EstevezDepartamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, SpainD. Álvarez PiquerasInstituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia - CSIC, Valencia, SpainMariagrazia AlviggiDipartimento di Fisica, Università di Napoli, Naples, ItalyY. Amaral CoutinhoUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilA. AmblerDepartment of Physics, McGill University, Montreal, CanadaL. AmbrozDepartment of Physics, Oxford University, Oxford, UKChristoph AmelungDepartment of Physics, Brandeis University, Waltham, USAD. AmideiDepartment of Physics, University of Michigan, Ann Arbor, USAS. P. Amor Dos SantosLaboratório de Instrumentação e Física Experimental de Partículas - LIP, Lisbon, PortugalS. AmorosoDeutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, GermanyCherifa Sabrina AmroucheDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, SwitzerlandF. F. AnDepartment of Physics and Astronomy, Iowa State University, Ames, USAChristos AnastopoulosDepartment of Physics and Astronomy, University of Sheffield, Sheffield, UKN. AndariIRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, FranceT. AndeenDepartment of Physics, University of Texas at Austin, Austin, USAC. F. AndersPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJohn Kenneth AndersAlbert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, SwitzerlandA. AndreazzaINFN Sezione di Milano, Milan, ItalyV. AndreiKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyC. R. AnelliDepartment of Physics and Astronomy, University of Victoria, Victoria, CanadaStylianos AngelidakisLPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, FranceAaron AngeramiNevis Laboratory, Columbia University, Irvington, USAAlexey AnisenkovNovosibirsk State University Novosibirsk, Novosibirsk, RussiaA. AnnoviINFN Sezione di Pisa, Pisa, ItalyC. AntelDépartement de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, SwitzerlandM. T. AnthonyDepartment of Physics and Astronomy, University of Sheffield, Sheffield, UKE. AntipovDepartment of Physics, Oklahoma State University, Stillwater, USAMario AntonelliINFN e Laboratori Nazionali di Frascati, Frascati, ItalyD. J. A. AntrimDepartment of Physics and Astronomy, University of California Irvine, Irvine, USAF. AnulliINFN Sezione di Roma, Rome, ItalyMasato AokiKEK, High Energy Accelerator Research Organization, Tsukuba, JapanJ. A. Aparisi PozoInstituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia - CSIC, Valencia, SpainL. Aperio BellaInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing, ChinaJ. P. AraqueLaboratório de Instrumentação e Física Experimental de Partículas - LIP, Lisbon, PortugalV. Araujo FerrazUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilR. Araujo PereiraUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil

2020lv

ABI

Annotatsiya

Abstract The inclusive top quark pair ( $$t\bar{t}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:math> ) production cross-section $$\sigma _{t\bar{t}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:msub> </mml:math> has been measured in proton–proton collisions at $$\sqrt{s}=13\,\text {TeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> <mml:mspace/> <mml:mtext>TeV</mml:mtext> </mml:mrow> </mml:math> , using 36.1 fb $$^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow/> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> of data collected in 2015–2016 by the ATLAS experiment at the LHC. Using events with an opposite-charge $$e\mu $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>e</mml:mi> <mml:mi>μ</mml:mi> </mml:mrow> </mml:math> pair and b -tagged jets, the cross-section is measured to be: $$\begin{aligned} \sigma _{t\bar{t}} = 826.4 \pm 3.6\,\mathrm {(stat)}\ \pm 11.5\,\mathrm {(syst)}\ \pm 15.7\,\mathrm {(lumi)}\ \pm 1.9\,\mathrm {(beam)}\,\mathrm {pb}, \end{aligned}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtable> <mml:mtr> <mml:mtd> <mml:mrow> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>826.4</mml:mn> <mml:mo>±</mml:mo> <mml:mn>3.6</mml:mn> <mml:mspace/> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>stat</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mspace/> <mml:mo>±</mml:mo> <mml:mn>11.5</mml:mn> <mml:mspace/> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>syst</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mspace/> <mml:mo>±</mml:mo> <mml:mn>15.7</mml:mn> <mml:mspace/> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>lumi</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mspace/> <mml:mo>±</mml:mo> <mml:mn>1.9</mml:mn> <mml:mspace/> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>beam</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mspace/> <mml:mi>pb</mml:mi> <mml:mo>,</mml:mo> </mml:mrow> </mml:mtd> </mml:mtr> </mml:mtable> </mml:mrow> </mml:math> where the uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, the integrated luminosity, and the LHC beam energy, giving a total uncertainty of 2.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. It is used to determine the top quark pole mass via the dependence of the predicted cross-section on $$m_t^{\mathrm{pole}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mi>t</mml:mi> <mml:mi>pole</mml:mi> </mml:msubsup> </mml:math> , giving $$m_t^{\mathrm{pole}}=173.1^{+2.0}_{-2.1}\,\text {GeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mi>t</mml:mi> <mml:mi>pole</mml:mi> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mn>173</mml:mn> <mml:mo>.</mml:mo> <mml:msubsup> <mml:mn>1</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>2.1</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>2.0</mml:mn> </mml:mrow> </mml:msubsup> <mml:mspace/> <mml:mtext>GeV</mml:mtext> </mml:mrow> </mml:math> . It is also combined with measurements at $$\sqrt{s}=7\,\text {TeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>7</mml:mn> <mml:mspace/> <mml:mtext>TeV</mml:mtext> </mml:mrow> </mml:math> and $$\sqrt{s}=8\,\text {TeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>8</mml:mn> <mml:mspace/> <mml:mtext>TeV</mml:mtext> </mml:mrow> </mml:math> to derive ratios and double ratios of $$t\bar{t}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>¯</mml:mo> </mml:mrow> </mml:mover> </mml:mrow> </mml:math> and Z cross-sections at different energies. The same

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DOI: 10.1140/epjc/s10052-020-7907-9

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