Hard photons in hadroproduction of top quarks with realistic final states
Abstract We present a complete description of top quark pair production in association with a hard photon in the dilepton channel. Our calculation is accurate to NLO in QCD. It is based on matrix elements for e + ν e μ − ν ¯ μ b b ¯ γ $$ {e}^{+}{\nu}_e{\mu}^{-}{\overline{\nu}}_{\mu }b\overline{b}\up...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-10-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP10(2018)158 |
| _version_ | 1828532220207300608 |
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| author | G. Bevilacqua H. B. Hartanto M. Kraus T. Weber M. Worek |
| author_facet | G. Bevilacqua H. B. Hartanto M. Kraus T. Weber M. Worek |
| author_sort | G. Bevilacqua |
| collection | DOAJ |
| description | Abstract We present a complete description of top quark pair production in association with a hard photon in the dilepton channel. Our calculation is accurate to NLO in QCD. It is based on matrix elements for e + ν e μ − ν ¯ μ b b ¯ γ $$ {e}^{+}{\nu}_e{\mu}^{-}{\overline{\nu}}_{\mu }b\overline{b}\upgamma $$ production and includes all resonant and non-resonant diagrams, interferences, and off-shell effects of the top quarks and the W gauge bosons. This calculation constitutes the first full computation for top quark pair production with a final state photon in hadronic collisions at NLO in QCD. Numerical results for total and differential cross sections are presented for the LHC at a centre-of-mass energy of s = 13 $$ \sqrt{s}=13 $$ TeV. For a few observables relevant for new physics searches, beyond some kinematic bounds, we observe shape distortions of more than 100%. In addition, we confirm that the size of the top quark off-shell effects for the total cross section is consistent with the expected uncertainties of the narrow width approximation. Results presented here are not only relevant for beyond the Standard Model physics searches but also important for precise measurements of the top-quark fiducial cross sections and top-quark properties at the LHC. |
| first_indexed | 2024-12-11T22:49:55Z |
| format | Article |
| id | doaj.art-5982167ce4ba4e8dad2e17ddff22ed92 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-11T22:49:55Z |
| publishDate | 2018-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-5982167ce4ba4e8dad2e17ddff22ed922022-12-22T00:47:29ZengSpringerOpenJournal of High Energy Physics1029-84792018-10-0120181012610.1007/JHEP10(2018)158Hard photons in hadroproduction of top quarks with realistic final statesG. Bevilacqua0H. B. Hartanto1M. Kraus2T. Weber3M. Worek4MTA-DE Particle Physics Research Group, University of DebrecenInstitute for Particle Physics Phenomenology, Department of Physics, Durham UniversityHumboldt-Universität zu Berlin, Institut für PhysikInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityAbstract We present a complete description of top quark pair production in association with a hard photon in the dilepton channel. Our calculation is accurate to NLO in QCD. It is based on matrix elements for e + ν e μ − ν ¯ μ b b ¯ γ $$ {e}^{+}{\nu}_e{\mu}^{-}{\overline{\nu}}_{\mu }b\overline{b}\upgamma $$ production and includes all resonant and non-resonant diagrams, interferences, and off-shell effects of the top quarks and the W gauge bosons. This calculation constitutes the first full computation for top quark pair production with a final state photon in hadronic collisions at NLO in QCD. Numerical results for total and differential cross sections are presented for the LHC at a centre-of-mass energy of s = 13 $$ \sqrt{s}=13 $$ TeV. For a few observables relevant for new physics searches, beyond some kinematic bounds, we observe shape distortions of more than 100%. In addition, we confirm that the size of the top quark off-shell effects for the total cross section is consistent with the expected uncertainties of the narrow width approximation. Results presented here are not only relevant for beyond the Standard Model physics searches but also important for precise measurements of the top-quark fiducial cross sections and top-quark properties at the LHC.http://link.springer.com/article/10.1007/JHEP10(2018)158NLO ComputationsQCD Phenomenology |
| spellingShingle | G. Bevilacqua H. B. Hartanto M. Kraus T. Weber M. Worek Hard photons in hadroproduction of top quarks with realistic final states Journal of High Energy Physics NLO Computations QCD Phenomenology |
| title | Hard photons in hadroproduction of top quarks with realistic final states |
| title_full | Hard photons in hadroproduction of top quarks with realistic final states |
| title_fullStr | Hard photons in hadroproduction of top quarks with realistic final states |
| title_full_unstemmed | Hard photons in hadroproduction of top quarks with realistic final states |
| title_short | Hard photons in hadroproduction of top quarks with realistic final states |
| title_sort | hard photons in hadroproduction of top quarks with realistic final states |
| topic | NLO Computations QCD Phenomenology |
| url | http://link.springer.com/article/10.1007/JHEP10(2018)158 |
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