The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD
Abstract Recent measurements of the pp → t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ process in multi-lepton final states, as performed by the ATLAS collaboration in the context of the Higgs boson studies in the t t ¯ H $$ t\overline{t}H $$ channel, have shown discrepancies between theoretical predictio...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-08-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP08(2020)043 |
| _version_ | 1818510930558844928 |
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| author | Giuseppe Bevilacqua Huan-Yu Bi Heribertus Bayu Hartanto Manfred Kraus Malgorzata Worek |
| author_facet | Giuseppe Bevilacqua Huan-Yu Bi Heribertus Bayu Hartanto Manfred Kraus Malgorzata Worek |
| author_sort | Giuseppe Bevilacqua |
| collection | DOAJ |
| description | Abstract Recent measurements of the pp → t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ process in multi-lepton final states, as performed by the ATLAS collaboration in the context of the Higgs boson studies in the t t ¯ H $$ t\overline{t}H $$ channel, have shown discrepancies between theoretical predictions and experimental data. Such discrepancies have been observed both in the overall normalisation as well as in the modelling of the t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ process. With the goal of understanding and resolving the modelling issues within the SM t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ process we report on the state-of-the-art NLO QCD computation for this process. Specifically, we calculate higher-order corrections to the e + ν e μ − ν ¯ μ e + ν e b b ¯ $$ {e}^{+}{\nu}_e{\mu}^{-}{\overline{\nu}}_{\mu }{e}^{+}{\nu}_eb\overline{b} $$ and e − ν ¯ e μ + ν μ e − ν ¯ e b b ¯ $$ {e}^{-}{\overline{\nu}}_e{\mu}^{+}{\nu}_{\mu }{e}^{-}{\overline{\nu}}_eb\overline{b} $$ final state at the LHC with s $$ \sqrt{s} $$ = 13 TeV. In the computation off-shell top quarks are described by Breit-Wigner propagators, furthermore, double-, single- as well as non-resonant top-quark contributions along with all interference effects are consistently incorporated at the matrix element level. Results at NLO QCD accuracy are presented in the form of fiducial integrated and differential cross sections for two selected renormalisation and factorisation scale choices and three different PDF sets. The impact of the top quark off-shell effects on the t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ cross section is also examined by an explicit comparison to the narrow-width approximation. |
| first_indexed | 2024-12-10T23:26:43Z |
| format | Article |
| id | doaj.art-0924978dc28f43bc972359b1825702c2 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-10T23:26:43Z |
| publishDate | 2020-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-0924978dc28f43bc972359b1825702c22022-12-22T01:29:33ZengSpringerOpenJournal of High Energy Physics1029-84792020-08-012020813310.1007/JHEP08(2020)043The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCDGiuseppe Bevilacqua0Huan-Yu Bi1Heribertus Bayu Hartanto2Manfred Kraus3Malgorzata Worek4MTA-DE Particle Physics Research Group, University of DebrecenInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityInstitute for Particle Physics Phenomenology, Department of Physics, Durham UniversityPhysics Department, Florida State UniversityInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityAbstract Recent measurements of the pp → t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ process in multi-lepton final states, as performed by the ATLAS collaboration in the context of the Higgs boson studies in the t t ¯ H $$ t\overline{t}H $$ channel, have shown discrepancies between theoretical predictions and experimental data. Such discrepancies have been observed both in the overall normalisation as well as in the modelling of the t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ process. With the goal of understanding and resolving the modelling issues within the SM t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ process we report on the state-of-the-art NLO QCD computation for this process. Specifically, we calculate higher-order corrections to the e + ν e μ − ν ¯ μ e + ν e b b ¯ $$ {e}^{+}{\nu}_e{\mu}^{-}{\overline{\nu}}_{\mu }{e}^{+}{\nu}_eb\overline{b} $$ and e − ν ¯ e μ + ν μ e − ν ¯ e b b ¯ $$ {e}^{-}{\overline{\nu}}_e{\mu}^{+}{\nu}_{\mu }{e}^{-}{\overline{\nu}}_eb\overline{b} $$ final state at the LHC with s $$ \sqrt{s} $$ = 13 TeV. In the computation off-shell top quarks are described by Breit-Wigner propagators, furthermore, double-, single- as well as non-resonant top-quark contributions along with all interference effects are consistently incorporated at the matrix element level. Results at NLO QCD accuracy are presented in the form of fiducial integrated and differential cross sections for two selected renormalisation and factorisation scale choices and three different PDF sets. The impact of the top quark off-shell effects on the t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ cross section is also examined by an explicit comparison to the narrow-width approximation.http://link.springer.com/article/10.1007/JHEP08(2020)043NLO ComputationsQCD Phenomenology |
| spellingShingle | Giuseppe Bevilacqua Huan-Yu Bi Heribertus Bayu Hartanto Manfred Kraus Malgorzata Worek The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD Journal of High Energy Physics NLO Computations QCD Phenomenology |
| title | The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD |
| title_full | The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD |
| title_fullStr | The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD |
| title_full_unstemmed | The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD |
| title_short | The simplest of them all: t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ at NLO accuracy in QCD |
| title_sort | simplest of them all t t ¯ w t overline t w pm at nlo accuracy in qcd |
| topic | NLO Computations QCD Phenomenology |
| url | http://link.springer.com/article/10.1007/JHEP08(2020)043 |
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