Direct top-quark decay width measurement in the t¯t lepton+jets channel at √s = 8 TeV with the ATLAS experiment

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and The ATLAS Collaboration, (2018) Direct top-quark decay width measurement in the t¯t lepton+jets channel at √s = 8 TeV with the ATLAS experiment. European Physical Journal C, 78 (129). ISSN 1434-6044

[img] PDF - Published Version
Available under License Creative Commons Attribution.

Download (2MB)

Abstract

This paper presents a direct measurement of the decay width of the top quark using tt¯ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 8 TeV and corresponds to an integrated luminosity of 20.2 fb−1. The decay width of the top quark is measured using a template fit to distributions of kinematic observables associated with the hadronically and semileptonically decaying top quarks. The result, Γt=1.76±0.33 (stat.) −0.68+0.79 (syst.) GeV for a top-quark mass of 172.5 GeV, is consistent with the prediction of the Standard Model.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Related URLs:
Depositing User: Billy Wichaidit
Date Deposited: 25 May 2018 15:41
Last Modified: 02 Jul 2019 15:33
URI: http://sro.sussex.ac.uk/id/eprint/76131

View download statistics for this item

📧 Request an update
Project NameSussex Project NumberFunderFunder Ref
ATLASG0275STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I006048/1