Inclusive and differential cross section measurements of top quark pair (tt¯) production in association with a photon (γ) are performed as a function of lepton, photon, top quark, and tt¯ kinematic observables, using data from proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 138 fb−1, collected at the CERN LHC with the CMS detector. Events containing two leptons (electrons or muons) and a photon in the final state are considered. The fiducial cross section of tt¯γ is measured to be 137 ± 8 fb, in a phase space including events with a high momentum, isolated photon. The fiducial cross section of tt¯γ is also measured to be 56 ± 5 fb when considering only events where the photon is emitted in the production part of the process. Both measurements are in agreement with the theoretical predictions, of 126 ± 19 fb and 57 ± 5 fb, respectively. Differential measurements are performed at the particle and parton levels. Additionally, inclusive and differential ratios between the cross sections of tt¯γ and tt¯ production are measured. The inclusive ratio is found to be 0.0133 ± 0.0005, in agreement with the standard model prediction of 0.0127 ± 0.0008. The top quark charge asymmetry in tt¯γ production is also measured to be −0.012 ± 0.042, compatible with both the standard model prediction and with no asymmetry.

Inclusive and differential measurements of the $$ \textrm{t}\overline{\textrm{t}}\upgamma $$ cross section and the $$ \textrm{t}\overline{\textrm{t}}\upgamma /\textrm{t}\overline{\textrm{t}} $$ cross section ratio in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

Calzaferri, S.
Membro del Collaboration Group
;
Montagna, P.
Membro del Collaboration Group
;
Pelliccioni, M.
Membro del Collaboration Group
;
Riccardi, C.
Membro del Collaboration Group
;
Salvini, P.
Membro del Collaboration Group
;
Vai, I.
Membro del Collaboration Group
;
Vitulo, P.
Membro del Collaboration Group
;
2026-01-01

Abstract

Inclusive and differential cross section measurements of top quark pair (tt¯) production in association with a photon (γ) are performed as a function of lepton, photon, top quark, and tt¯ kinematic observables, using data from proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 138 fb−1, collected at the CERN LHC with the CMS detector. Events containing two leptons (electrons or muons) and a photon in the final state are considered. The fiducial cross section of tt¯γ is measured to be 137 ± 8 fb, in a phase space including events with a high momentum, isolated photon. The fiducial cross section of tt¯γ is also measured to be 56 ± 5 fb when considering only events where the photon is emitted in the production part of the process. Both measurements are in agreement with the theoretical predictions, of 126 ± 19 fb and 57 ± 5 fb, respectively. Differential measurements are performed at the particle and parton levels. Additionally, inclusive and differential ratios between the cross sections of tt¯γ and tt¯ production are measured. The inclusive ratio is found to be 0.0133 ± 0.0005, in agreement with the standard model prediction of 0.0127 ± 0.0008. The top quark charge asymmetry in tt¯γ production is also measured to be −0.012 ± 0.042, compatible with both the standard model prediction and with no asymmetry.
2026
Esperti anonimi
Inglese
Internazionale
ELETTRONICO
2026
4
Hadron-Hadron Scattering; Particle and Resonance Production; Top Physics
https://link.springer.com/article/10.1007/JHEP04(2026)086
2421
info:eu-repo/semantics/article
262
Null, Null; Hayrapetyan, A.; Makarenko, V.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Benato, L.; Bergauer, T.; Dragicevic, M.; Giordano, C.; Hussai...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1551686
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