Determination of the top-quark pole mass using tt¯+ 1-jet events collected with the ATLAS experiment in 7 TeV pp collisions
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KünyeAad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R. ... ATLAS Collaboration. (2015). Determination of the top-quark pole mass using tt¯+ 1-jet events collected with the ATLAS experiment in 7 TeV pp collisions. Journal of High Energy Physics, 2015(10), 1-41. http://dx.doi.org/10.1007/JHEP10(2015)121
The normalized differential cross section for top-quark pair production in association with at least one jet is studied as a function of the inverse of the invariant mass of the tt¯(Formula presented.) + 1-jet system. This distribution can be used for a precise determination of the top-quark mass since gluon radiation depends on the mass of the quarks. The experimental analysis is based on proton-proton collision data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.6 fb−1. The selected events were identified using the lepton+jets top-quark-pair decay channel, where lepton refers to either an electron or a muon. The observed distribution is compared to a theoretical prediction at next-to-leading-order accuracy in quantum chromodynamics using the pole-mass scheme. With this method, the measured value of the top-quark pole mass, mt pole, is:mtpole=173.7±1.5stat.±1.4syst.−0.5+1.0theoryGeV.(Formula presented.). This result represents the most precise measurement of the top-quark pole mass to date.