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EnglishThe 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}.
| Titolo: | Measurement of the top quark mass in the ttbar → lepton+jets channel from sqrt(s) = 8 TeV ATLAS data and combination with previous results |
| Autori: | |
| Data di pubblicazione: | 2019 |
| Rivista: | |
| 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}. |
| Handle: | http://hdl.handle.net/11587/429717 |
| Appare nelle tipologie: | Articolo pubblicato su Rivista |
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