Determination of the top-quark pole mass using tt t\overline{t} + 1-jet events collected with the ATLAS experiment in 7 TeV pp collisions

Collaboration
Jul 7, 2015
23 pages
Published in:
  • JHEP 10 (2015) 121
  • Published: Oct 19, 2015
e-Print:
Report number:
  • CERN-PH-EP-2015-100
Experiments:

Citations per year

20152017201920212023051015202530
Abstract: (Springer)
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 t\overline{t} + 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 fb1^{−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, mtpole_{t}^{pole} , is: mtpole=173.7±1.5(stat.)±1.4(syst.)0.5+1.0(theory)GeV. {m}_t^{\mathrm{pole}}=173.7\pm 1.5\left(\mathrm{stat}.\right)\pm 1.4{\left(\mathrm{syst}.\right)}_{-0.5}^{+1.0}\left(\mathrm{theory}\right)\mathrm{GeV}.
Note:
  • Hadron-Hadron Scattering
  • Top physics
  • p p: scattering
  • p p: colliding beams
  • jet: associated production
  • mass: pole
  • top: pair production
  • top: mass: measured
  • quark: mass
  • gluon: radiation