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Measurement of the Top Quark Mass in the Dileptonic T(T)Over-Bar Decay Channel Using the Mass Observables M-Bl, M-T2, and M-Blv In Pp Collisions at Root=8 Tev

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Date
2017
Author
Hökelek, Tuncer
Dal, Hakan
Tercan, Barış
Özbek, F. Elif
Necefoğlu, Hacali
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Abstract
A measurement of the top quark mass (M-t) in the dileptonic t (t) over bar 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 corresponds to an integrated luminosity of 19.7 +/- 0.5 fb(-1). 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 Mt. An invariant mass observable, M-bl, 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-blv, 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)(-0.93)(+0.89) (syst) GeV.
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https://doi.org/10.1103/PhysRevD.96.032002
http://hdl.handle.net/11655/18397
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