Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at root s=7 TeVVisa övriga samt affilieringar
Antal upphovsmän: 28922015 (Engelska)Ingår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, nr 4, artikel-id 158Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
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 root 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 multijet production 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
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2015. Vol. 75, nr 4, artikel-id 158
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Identifikatorer
URN: urn:nbn:se:uu:diva-258296DOI: 10.1140/epjc/s10052-015-3373-1ISI: 000355671300001OAI: oai:DiVA.org:uu-258296DiVA, id: diva2:841410
Anmärkning
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-015-3373-1
2015-07-132015-07-132017-12-04Bibliografiskt granskad