Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-10-21
Phys.Rev.Lett.105:252001,2010
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 3 figures. Edited in response to referee comments and resubmitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.105.252001
A precision measurement of the top quark mass m_t is obtained using a sample of ttbar events from ppbar collisions at the Fermilab Tevatron with the CDF II detector. Selected events require an electron or muon, large missing transverse energy, and exactly four high-energy jets, at least one of which is tagged as coming from a b quark. A likelihood is calculated using a matrix element method with quasi-Monte Carlo integration taking into account finite detector resolution and jet mass effects. The event likelihood is a function of m_t and a parameter DJES to calibrate the jet energy scale /in situ/. Using a total of 1087 events, a value of m_t = 173.0 +/- 1.2 GeV/c^2 is measured.
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