Measurement of the top quark mass in the t ¯t → lepton+jets and t ¯t → dilepton channels using √s = 7 TeV ATLAS data

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Measurement of the top quark mass in the t ¯t → lepton+jets and t ¯t → dilepton channels using √s = 7 TeV ATLAS data. European physical journal. C - particles and fields, C75(7), p. 330. EDP Sciences 10.1140/epjc/s10052-015-3544-0

[img]
Preview
Text
art%3A10.1140%2Fepjc%2Fs10052-015-3544-0.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (6MB) | Preview

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 4.6fb −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 m ℓb 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)±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 m top =172.99±0.48(stat)±0.78(syst) GeV, with a total uncertainty of 0.91 GeV. 1.02(syst) GeV, and 173.79 ± 0.54(stat) ± 1.30(syst) GeV in the t ¯t → lepton+jets and t ¯t → 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science

UniBE Contributor:

Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

07 Sep 2016 15:22

Last Modified:

11 Sep 2016 02:11

Publisher DOI:

10.1140/epjc/s10052-015-3544-0

ArXiv ID:

1503.05427v2

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt

BORIS DOI:

10.7892/boris.87642

URI:

https://boris.unibe.ch/id/eprint/87642

Actions (login required)

Edit item Edit item
Provide Feedback