Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at √s=7 TeV

ATLAS, Collaboration; Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at √s=7 TeV. European physical journal. C - particles and fields, C75(4), p. 158. EDP Sciences 10.1140/epjc/s10052-015-3373-1

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The mass of the top quark is measured in a data set corresponding to 4.6 fb⁻¹ of proton-proton collisions with centre-of-mass energy √s=7 TeV collected by the ATLAS detector at the LHC. Events consistent with hadronic decays of top-antitop quark pairs with at least six jets in the final state are selected. The substantial background from multijetproduction is modelled with data-driven methods that utilise the number of identified b -quark jets and the transverse momentum of the sixth leading jet,which have minimal correlation. The top-quark mass is obtained from template fits to the ratio of three-jet to dijet mass. The three-jet mass is calculated from the three jets produced in a top-quark decay. Using these three jets the dijet mass is obtained from the two jets produced in the W boson decay. The top-quark mass obtained from this fit is thus less sensitive to the uncertainty in the energy measurement of the jets. A binned likelihood fit yields a top-quark mass of m t =175.1±1.4 (stat) ±1.2 (syst) 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)

UniBE Contributor:

Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Schneider, Basil; 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:

12 Sep 2016 09:44

Last Modified:

18 Sep 2016 02:08

Publisher DOI:

10.1140/epjc/s10052-015-3373-1

ArXiv ID:

1409.0832

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt

BORIS DOI:

10.7892/boris.87691

URI:

https://boris.unibe.ch/id/eprint/87691

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