NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolation
Abstract We present a complete description of top quark pair production in association with a hard photon in the di-lepton decay channel. The calculation is performed at NLO QCD and includes all resonant and non-resonant Feynman diagrams, interferences, and finite-width effects of the top quarks and...
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| Language: | English |
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SpringerOpen
2025-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2025)156 |
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| author | Daniel Stremmer Malgorzata Worek |
| author_facet | Daniel Stremmer Malgorzata Worek |
| author_sort | Daniel Stremmer |
| collection | DOAJ |
| description | Abstract We present a complete description of top quark pair production in association with a hard photon in the di-lepton decay channel. The calculation is performed at NLO QCD and includes all resonant and non-resonant Feynman diagrams, interferences, and finite-width effects of the top quarks and W ±/Z gauge bosons. We provide the results for the pp → e + ν e μ − ν ¯ b b ¯ γ $$ {e}^{+}{\nu}_e\ {\mu}^{-}\ \overline{\nu}\ b\overline{b}\ \gamma $$ + X process using the fixed-cone, smooth-cone and hybrid-photon isolation criteria. The fixed-cone isolation criterion allows contributions from collinear photon radiation off QCD partons, which requires the inclusion of parton-to-photon fragmention processes. To this end, we include the latter contributions into our computational framework. We quantify the impact of different photon-isolation prescriptions on the integrated and differential cross-section predictions for the LHC at a centre-of-mass energy of s $$ \sqrt{s} $$ = 13.6 TeV. Our state-of-the-art NLO QCD results with the fixed-cone criterion allow us to reproduce the photon-isolation prescription employed in ATLAS and CMS. This will help to improve future comparisons with the LHC data. |
| format | Article |
| id | doaj-art-7350f11d81044191a4413555066361b1 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
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| series | Journal of High Energy Physics |
| spelling | doaj-art-7350f11d81044191a4413555066361b12025-02-09T12:07:13ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025113110.1007/JHEP01(2025)156NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolationDaniel Stremmer0Malgorzata Worek1Institute 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 di-lepton decay channel. The calculation is performed at NLO QCD and includes all resonant and non-resonant Feynman diagrams, interferences, and finite-width effects of the top quarks and W ±/Z gauge bosons. We provide the results for the pp → e + ν e μ − ν ¯ b b ¯ γ $$ {e}^{+}{\nu}_e\ {\mu}^{-}\ \overline{\nu}\ b\overline{b}\ \gamma $$ + X process using the fixed-cone, smooth-cone and hybrid-photon isolation criteria. The fixed-cone isolation criterion allows contributions from collinear photon radiation off QCD partons, which requires the inclusion of parton-to-photon fragmention processes. To this end, we include the latter contributions into our computational framework. We quantify the impact of different photon-isolation prescriptions on the integrated and differential cross-section predictions for the LHC at a centre-of-mass energy of s $$ \sqrt{s} $$ = 13.6 TeV. Our state-of-the-art NLO QCD results with the fixed-cone criterion allow us to reproduce the photon-isolation prescription employed in ATLAS and CMS. This will help to improve future comparisons with the LHC data.https://doi.org/10.1007/JHEP01(2025)156Higher-Order Perturbative CalculationsSpecific QCD PhenomenologyTop Quark |
| spellingShingle | Daniel Stremmer Malgorzata Worek NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolation Journal of High Energy Physics Higher-Order Perturbative Calculations Specific QCD Phenomenology Top Quark |
| title | NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolation |
| title_full | NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolation |
| title_fullStr | NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolation |
| title_full_unstemmed | NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolation |
| title_short | NLO QCD predictions for t t ¯ γ $$ t\overline{t}\gamma $$ with realistic photon isolation |
| title_sort | nlo qcd predictions for t t ¯ γ t overline t gamma with realistic photon isolation |
| topic | Higher-Order Perturbative Calculations Specific QCD Phenomenology Top Quark |
| url | https://doi.org/10.1007/JHEP01(2025)156 |
| work_keys_str_mv | AT danielstremmer nloqcdpredictionsforttgtoverlinetgammawithrealisticphotonisolation AT malgorzataworek nloqcdpredictionsforttgtoverlinetgammawithrealisticphotonisolation |