The top-quark mass is measured using top-quark decays producing an isolated lepton and J/psi meson reconstructed in its mu+ mu- decay mode. The data sample was recorded with the ATLAS detector in proton-proton collisions at a centre-of-mass energy of root s = 13 TeV during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb-1. The measurement is based on the invariant mass m(l mu+ mu−) of the system made of the isolated lepton l from the W boson decay and the non-isolated mu+ mu− pair from a J/psi decay of a b-hadron, exploiting its sensitivity to the top-quark mass. An unbinned maximum-likelihood fit to the m(l mu+ mu−) distribution is performed to extract the top-quark mass. The top-quark mass is measured to be mtop = 172.17+-0.80(stat)+-0.81(syst)+-1.07 (recoil) GeV, with a total uncertainty of 1.56 GeV. The third uncertainty arises from changing the dipole parton shower gluon-recoil scheme used in top-quark decays.

Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Measurement of the top-quark mass using decays with a J/psi meson at root s = 13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(4) [10.1007/jhep04(2026)099].

Measurement of the top-quark mass using decays with a J/psi meson at root s = 13 TeV with the ATLAS detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

Abstract

The top-quark mass is measured using top-quark decays producing an isolated lepton and J/psi meson reconstructed in its mu+ mu- decay mode. The data sample was recorded with the ATLAS detector in proton-proton collisions at a centre-of-mass energy of root s = 13 TeV during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb-1. The measurement is based on the invariant mass m(l mu+ mu−) of the system made of the isolated lepton l from the W boson decay and the non-isolated mu+ mu− pair from a J/psi decay of a b-hadron, exploiting its sensitivity to the top-quark mass. An unbinned maximum-likelihood fit to the m(l mu+ mu−) distribution is performed to extract the top-quark mass. The top-quark mass is measured to be mtop = 172.17+-0.80(stat)+-0.81(syst)+-1.07 (recoil) GeV, with a total uncertainty of 1.56 GeV. The third uncertainty arises from changing the dipole parton shower gluon-recoil scheme used in top-quark decays.
2026
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Measurement of the top-quark mass using decays with a J/psi meson at root s = 13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(4) [10.1007/jhep04(2026)099].
Null, N; Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Ach...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/462705
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