Inclusive and differential measurements of the t(t)over-barγ cross section and the t(t)over-barγ/t(t)over-bar cross section ratio in proton-proton collisions at √<i>s</i>=13 TeV


Hayrapetyan A., Makarenko V., Tumasyan A., Adam W., Andrejkovic J., Benato L., ...Daha Fazla

JOURNAL OF HIGH ENERGY PHYSICS, cilt.2026, sa.4, 2026 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2026 Sayı: 4
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1007/jhep04(2026)086
  • Dergi Adı: JOURNAL OF HIGH ENERGY PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, INSPEC, MathSciNet, zbMATH, Directory of Open Access Journals, Academic Search Ultimate (EBSCO), Technology Collection (ProQuest)
  • Anahtar Kelimeler: Hadron-Hadron Scattering, Particle and Resonance Production, Top Physics
  • İstanbul Üniversitesi Adresli: Evet

Özet

Inclusive and differential cross section measurements of top quark pair (t (t) over bar) production in association with a photon (gamma) are performed as a function of lepton, photon, top quark, and t (t) over bar kinematic observables, using data from proton-proton collisions at root 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 t (t) over bar gamma is measured to be 137 +/- 8 fb, in a phase space including events with a high momentum, isolated photon. The fiducial cross section of t (t) over bar gamma 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 t (t) over bar gamma and t (t) over bar 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 t (t) over bar gamma production is also measured to be -0.012 +/- 0.042, compatible with both the standard model prediction and with no asymmetry.