A measurement of the top quark pair (t ̄t) production cross section in proton- proton collisions at a centre-of-mass energy of 5.02 TeV is presented. The data were collected at the LHC in autumn 2017, in dedicated runs with low-energy and low-intensity conditions with respect to the default configuration, and correspond to an integrated luminosity of 302pb−1. The measurement is performed using events with one electron or muon, and multiple jets, at least one of them being identified as originating from a b quark (b tagged). Events are classified based on the number of all reconstructed jets and of b-tagged jets. Multivariate analysis techniques are used to enhance the separation between the signal and backgrounds. The measured cross section is 62.5 ± 1.6 (stat)+2.6 (syst) ± 1.2 (lumi) pb. A −2.5 combination with the result in the dilepton channel based on the same data set yields a value of 62.3±1.5 (stat)±2.4 (syst)±1.2 (lumi) pb, to be compared with the standard model prediction of 69.5 +3.5 pb at next-to-next-to-leading order in perturbative quantum chromodynamics. −3.7

Measurement of the inclusive $$ \textrm{t}\overline{\textrm{t}} $$ cross section in final states with at least one lepton and additional jets with 302 pb−1 of pp collisions at $$ \sqrt{\textrm{s}} $$ = 5.02 TeV

Alexe, C.;Bruschini, D.;
2025

Abstract

A measurement of the top quark pair (t ̄t) production cross section in proton- proton collisions at a centre-of-mass energy of 5.02 TeV is presented. The data were collected at the LHC in autumn 2017, in dedicated runs with low-energy and low-intensity conditions with respect to the default configuration, and correspond to an integrated luminosity of 302pb−1. The measurement is performed using events with one electron or muon, and multiple jets, at least one of them being identified as originating from a b quark (b tagged). Events are classified based on the number of all reconstructed jets and of b-tagged jets. Multivariate analysis techniques are used to enhance the separation between the signal and backgrounds. The measured cross section is 62.5 ± 1.6 (stat)+2.6 (syst) ± 1.2 (lumi) pb. A −2.5 combination with the result in the dilepton channel based on the same data set yields a value of 62.3±1.5 (stat)±2.4 (syst)±1.2 (lumi) pb, to be compared with the standard model prediction of 69.5 +3.5 pb at next-to-next-to-leading order in perturbative quantum chromodynamics. −3.7
2025
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Hadron-Hadron Scattering, Particle and Resonance Production, Top Physics
  
     https://doi.org/10.1007/JHEP04(2025)099
     https://dx.doi.org/10.1007/JHEP04(2025)099
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/154957
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