The top quark mass is measured using a template method in the tar{t} ightarrow mathrm {lepton+jets} channel (lepton is e or mu ) using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton–proton centre-of-mass energy of {sqrt{s}} =8 ext {TeV} and correspond to an integrated luminosity of 20.2 fb ^{-1}. The tar{t} ightarrow mathrm {lepton+jets} channel is characterized by the presence of a charged lepton, a neutrino and four jets, two of which originate from bottom quarks (b). Exploiting a three-dimensional template technique, the top quark mass is determined together with a global jet energy scale factor and a relative b-to-light-jet energy scale factor. The mass of the top quark is measured to be m_{mathrm {top}} =172.08 ,pm ,0.39 ,mathrm {(stat)},pm ,0.82 ,mathrm {(syst)} ext {GeV}. A combination with previous ATLAS m_{mathrm {top}} measurements gives m_{mathrm {top}} = 172.69 ,pm ,0.25 ,mathrm {(stat)},pm ,0.41 ,mathrm {(syst)} ext {GeV}.
Measurement of the top quark mass in the ttbar → lepton+jets channel from sqrt(s) = 8 TeV ATLAS data and combination with previous results
G Chiodini;E Gorini;F Gravili;L Longo;A Mirto;M Reale;E Schioppa;S Spagnolo;A Ventura;
2019-01-01
Abstract
The top quark mass is measured using a template method in the tar{t} ightarrow mathrm {lepton+jets} channel (lepton is e or mu ) using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton–proton centre-of-mass energy of {sqrt{s}} =8 ext {TeV} and correspond to an integrated luminosity of 20.2 fb ^{-1}. The tar{t} ightarrow mathrm {lepton+jets} channel is characterized by the presence of a charged lepton, a neutrino and four jets, two of which originate from bottom quarks (b). Exploiting a three-dimensional template technique, the top quark mass is determined together with a global jet energy scale factor and a relative b-to-light-jet energy scale factor. The mass of the top quark is measured to be m_{mathrm {top}} =172.08 ,pm ,0.39 ,mathrm {(stat)},pm ,0.82 ,mathrm {(syst)} ext {GeV}. A combination with previous ATLAS m_{mathrm {top}} measurements gives m_{mathrm {top}} = 172.69 ,pm ,0.25 ,mathrm {(stat)},pm ,0.41 ,mathrm {(syst)} ext {GeV}.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
