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Title: | Measurement of the top quark mass in the tt → lepton+jets and tt → dilepton channels using √s = 7 TeV ATLAS data | Authors: | Santos, S. P. Amor dos Carvalho, J. Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. ATLAS Collaboration |
Issue Date: | 2015 | Publisher: | Springer Nature | Serial title, monograph or event: | European Physical Journal C | Volume: | 75 | Issue: | 7 | Abstract: | The top quark mass was measured in the channels tt → lepton+jets and tt → dilepton (lepton = e, μ) based on ATLAS data recorded in 2011. The data were taken at the LHC with a proton–proton centre-of-mass energy of √s = 7 TeV and correspond to an integrated luminosity of 4.6 fb−1. The tt → lepton+jets analysis uses a three-dimensional template technique which determines the top quark mass together with a global jet energy scale factor (JSF), and a relative b-to-light-jet energy scale factor (bJSF), where the terms b-jets and light-jets refer to jets originating from b-quarks and u, d, c, s-quarks or gluons, respectively. The analysis of the tt → dilepton channel exploits a one-dimensional template method using the mℓb observable, defined as the average invariant mass of the two lepton+b-jet pairs in each event. The top quark mass is measured to be 172.33 ± 0.75(stat + JSF + bJSF) ± 1.02(syst) GeV, and 173.79 ± 0.54(stat) ± 1.30(syst) GeV in the tt → lepton+jets and tt → dilepton channels, respectively. The combination of the two results yields mtop = 172.99 ± 0.48(stat) ± 0.78(syst) GeV, with a total uncertainty of 0.91 GeV. | URI: | https://hdl.handle.net/10316/109111 | DOI: | 10.1140/epjc/s10052-015-3544-0 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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Measurement-of-the-top-quark-mass-in-the-tt--leptonjets-and-tt--dilepton-channels-using-s--7-TeV-ATLAS-dataEuropean-Physical-Journal-C.pdf | 6.06 MB | Adobe PDF | View/Open |
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