The first measurements of the top- and antitop-quark differential production cross sections and the top-quark charge asymmetry in the forward region are presented, using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.4 fb-1. The total production cross sections of top and antitop quarks are also determined. Measurements are performed using the μ+b-jet final state within a fiducial region defined by b-jet pT,jet>50 GeV and pseudorapidity 2.2<ηjet<4.0, with the muon from the W-boson decay required to have pT,μ>25 GeV and 2.0<ημ<4.5. The muon and b-jet system must satisfy pT(μ+jet)>20 GeV. The measured integrated production cross sections for the top and antitop quarks are σt=0.95±0.04±0.08±0.02 pb, σt¯=0.81±0.03±0.07±0.02 pb, where the first uncertainty is statistical, the second systematic, and the third accounts for the luminosity uncertainty. The top-quark charge asymmetry is measured to be ACt=0.08±0.03±0.01, where the first uncertainty is statistical and the second is systematic. These results are consistent with next-to-leading order Standard Model predictions.

Measurement of the Top-Quark Production Cross Section and Charge Asymmetry at LHCb

Graverini E.;Lazzari F.;Punzi G.;
2026-01-01

Abstract

The first measurements of the top- and antitop-quark differential production cross sections and the top-quark charge asymmetry in the forward region are presented, using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.4 fb-1. The total production cross sections of top and antitop quarks are also determined. Measurements are performed using the μ+b-jet final state within a fiducial region defined by b-jet pT,jet>50 GeV and pseudorapidity 2.2<ηjet<4.0, with the muon from the W-boson decay required to have pT,μ>25 GeV and 2.0<ημ<4.5. The muon and b-jet system must satisfy pT(μ+jet)>20 GeV. The measured integrated production cross sections for the top and antitop quarks are σt=0.95±0.04±0.08±0.02 pb, σt¯=0.81±0.03±0.07±0.02 pb, where the first uncertainty is statistical, the second systematic, and the third accounts for the luminosity uncertainty. The top-quark charge asymmetry is measured to be ACt=0.08±0.03±0.01, where the first uncertainty is statistical and the second is systematic. These results are consistent with next-to-leading order Standard Model predictions.
2026
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinen, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1367334
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact