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Measurement of the top-quark mass using decays with a J/ψ meson at s=13 TeV with the ATLAS detector
Journal article   Open access   Peer reviewed

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

G. Aad, J. Moss, ATLAS Collaboration, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, …
The journal of high energy physics, Vol.2026(4), p.99
04/14/2026

Abstract

Classical and Quantum Gravitation Elementary Particles Physics and Astronomy Quantum Field Theories Regular Article - Experimental Physics Relativity Theory Physics Quantum Field Theory Quantum Physics String Theory
The top-quark mass is measured using top-quark decays producing an isolated lepton and J/ψ meson reconstructed in its μ+μ− decay mode. The data sample was recorded with the ATLAS detector in proton-proton collisions at a centre-of-mass energy of 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(ℓμ+μ−) of the system made of the isolated lepton ℓ from the W boson decay and the non-isolated μ+μ− pair from a J/ψ decay of a b-hadron, exploiting its sensitivity to the top-quark mass. An unbinned maximum-likelihood fit to the m(ℓμ+μ−) 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.
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https://doi.org/10.1007/JHEP04(2026)099View
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