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| File | Dimensione | Formato | |
|---|---|---|---|
|
JHEP04(2025)099.pdf
accesso aperto
Tipologia:
Published version
Licenza:
Creative Commons
Dimensione
1.16 MB
Formato
Adobe PDF
|
1.16 MB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



