Measurement of the top quark mass in the dileptonic t-tbar decay channel using the mass observables Mbl, MT2, and Mblν in pp collisions at sqrt(s) = 8 TeVстатья

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Дата последнего поиска статьи во внешних источниках: 26 января 2018 г.

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[1] Measurement of the top quark mass in the dileptonic t-tbar decay channel using the mass observables mbl, mt2, and mblν in pp collisions at sqrt(s) = 8 tev / A. Baskakov, A. V. Belyaev, E. Boos et al. // Physical Review D. — 2017. — Vol. 96, no. 3. — P. 032002. A measurement of the top quark mass (M[t]) in the dileptonic ttbar decay channel is performed using data from proton-proton collisions at a center-of-mass energy of 8 TeV. The data was recorded by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 +/- 0.5 inverse femtobarns. Events are selected with two oppositely charged leptons (l = e, mu) and two jets identified as originating from b quarks. The analysis is based on three kinematic observables whose distributions are sensitive to the value of M[t]. An invariant mass observable, M[b l], and a `stransverse mass' observable, M[T2], are employed in a simultaneous fit to determine the value of M[t] and an overall jet energy scale factor (JSF). A complementary approach is used to construct an invariant mass observable, M[b l nu], that is combined with M[T2] to measure M[t]. The shapes of the observables, along with their evolutions in M[t] and JSF, are modeled by a nonparametric Gaussian process regression technique. The sensitivity of the observables to the value of M[t] is investigated using a Fisher information density method. The top quark mass is measured to be 172.22 +/- 0.18 (stat) +0.89/-0.93 (syst) GeV. [ DOI ]

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