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Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at s = 13 TeV with the ATLAS detector.
- Source :
- Journal of High Energy Physics; Jun2023, Vol. 2023 Issue 6, p1-56, 56p
- Publication Year :
- 2023
-
Abstract
- A measurement of the top-quark mass (m<subscript>t</subscript>) in the t t ¯ → lepton + jets channel is presented, with an experimental technique which exploits semileptonic decays of b-hadrons produced in the top-quark decay chain. The distribution of the invariant mass m<subscript>ℓμ</subscript> of the lepton, ℓ (with ℓ = e, μ), from the W-boson decay and the muon, μ, originating from the b-hadron decay is reconstructed, and a binned-template profile likelihood fit is performed to extract m<subscript>t</subscript>. The measurement is based on data corresponding to an integrated luminosity of 36.1 fb<superscript>−1</superscript> of s = 13 TeV pp collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. The measured value of the top-quark mass is m<subscript>t</subscript> = 174.41 ± 0.39 (stat.) ± 0.66 (syst.) ± 0.25 (recoil) GeV, where the third uncertainty arises from changing the Pythia8 parton shower gluon-recoil scheme, used in top-quark decays, to a recently developed setup. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11266708
- Volume :
- 2023
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of High Energy Physics
- Publication Type :
- Academic Journal
- Accession number :
- 165036445
- Full Text :
- https://doi.org/10.1007/JHEP06(2023)019