t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions
Abstract We report on the calculation of the next-to-leading order QCD corrections to the production of a t t ¯ $$ t\overline{t} $$ pair in association with two heavy-flavour jets. We concentrate on the di-lepton t t ¯ $$ t\overline{t} $$ decay channel at the LHC with s $$ \sqrt{s} $$ = 13 TeV. The...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-08-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP08(2021)008 |
| _version_ | 1818832892976955392 |
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| author | Giuseppe Bevilacqua Huan-Yu Bi Heribertus Bayu Hartanto Manfred Kraus Michele Lupattelli Malgorzata Worek |
| author_facet | Giuseppe Bevilacqua Huan-Yu Bi Heribertus Bayu Hartanto Manfred Kraus Michele Lupattelli Malgorzata Worek |
| author_sort | Giuseppe Bevilacqua |
| collection | DOAJ |
| description | Abstract We report on the calculation of the next-to-leading order QCD corrections to the production of a t t ¯ $$ t\overline{t} $$ pair in association with two heavy-flavour jets. We concentrate on the di-lepton t t ¯ $$ t\overline{t} $$ decay channel at the LHC with s $$ \sqrt{s} $$ = 13 TeV. The computation is based on pp → e + ν e μ − ν ¯ $$ \overline{\nu} $$ μ b b ¯ b b ¯ $$ b\overline{b}b\overline{b} $$ matrix elements and includes all resonant and non-resonant diagrams, interferences and off-shell effects of the top quark and the W gauge boson. As it is customary for such studies, results are presented in the form of inclusive and differential fiducial cross sections. We extensively investigate the dependence of our results upon variation of renormalisation and factorisation scales and parton distribution functions in the quest for an accurate estimate of the theoretical uncertainties. We additionally study the impact of the contributions induced by the bottom-quark parton density. Results presented here are particularly relevant for measurements of t t ¯ H $$ t\overline{t}H $$ (H → b b ¯ $$ b\overline{b} $$ ) and the determination of the Higgs coupling to the top quark. In addition, they might be used for precise measurements of the top-quark fiducial cross sections and to investigate top-quark decay modelling at the LHC. |
| first_indexed | 2024-12-19T02:10:15Z |
| format | Article |
| id | doaj.art-2aed56440e02489b8d9da46fc9e9f3cd |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-19T02:10:15Z |
| publishDate | 2021-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-2aed56440e02489b8d9da46fc9e9f3cd2022-12-21T20:40:49ZengSpringerOpenJournal of High Energy Physics1029-84792021-08-012021813710.1007/JHEP08(2021)008t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitionsGiuseppe Bevilacqua0Huan-Yu Bi1Heribertus Bayu Hartanto2Manfred Kraus3Michele Lupattelli4Malgorzata Worek5MTA-DE Particle Physics Research Group, University of DebrecenInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityCavendish Laboratory, University of CambridgePhysics Department, Florida State UniversityInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityAbstract We report on the calculation of the next-to-leading order QCD corrections to the production of a t t ¯ $$ t\overline{t} $$ pair in association with two heavy-flavour jets. We concentrate on the di-lepton t t ¯ $$ t\overline{t} $$ decay channel at the LHC with s $$ \sqrt{s} $$ = 13 TeV. The computation is based on pp → e + ν e μ − ν ¯ $$ \overline{\nu} $$ μ b b ¯ b b ¯ $$ b\overline{b}b\overline{b} $$ matrix elements and includes all resonant and non-resonant diagrams, interferences and off-shell effects of the top quark and the W gauge boson. As it is customary for such studies, results are presented in the form of inclusive and differential fiducial cross sections. We extensively investigate the dependence of our results upon variation of renormalisation and factorisation scales and parton distribution functions in the quest for an accurate estimate of the theoretical uncertainties. We additionally study the impact of the contributions induced by the bottom-quark parton density. Results presented here are particularly relevant for measurements of t t ¯ H $$ t\overline{t}H $$ (H → b b ¯ $$ b\overline{b} $$ ) and the determination of the Higgs coupling to the top quark. In addition, they might be used for precise measurements of the top-quark fiducial cross sections and to investigate top-quark decay modelling at the LHC.https://doi.org/10.1007/JHEP08(2021)008NLO ComputationsQCD Phenomenology |
| spellingShingle | Giuseppe Bevilacqua Huan-Yu Bi Heribertus Bayu Hartanto Manfred Kraus Michele Lupattelli Malgorzata Worek t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions Journal of High Energy Physics NLO Computations QCD Phenomenology |
| title | t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions |
| title_full | t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions |
| title_fullStr | t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions |
| title_full_unstemmed | t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions |
| title_short | t t ¯ b b ¯ $$ t\overline{t}b\overline{b} $$ at the LHC: on the size of corrections and b-jet definitions |
| title_sort | t t ¯ b b ¯ t overline t b overline b at the lhc on the size of corrections and b jet definitions |
| topic | NLO Computations QCD Phenomenology |
| url | https://doi.org/10.1007/JHEP08(2021)008 |
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