A measurement of the top quark mass ( M t ) in the dileptonic t ̄ t 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 ¼ e , μ ) 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 T 2 , 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 ν , that is combined with M T 2 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 ð stat Þ þ 0 . 89 − 0 . 93 ð syst Þ GeV

Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2017). Measurement of the top quark mass in the dileptonic tt¯ decay channel using the mass observables Mbℓ , MT2 , and Mbℓν in pp collisions at s=8  TeV. PHYSICAL REVIEW D, 96(3), 1-31 [10.1103/PhysRevD.96.032002].

Measurement of the top quark mass in the dileptonic tt¯ decay channel using the mass observables Mbℓ , MT2 , and Mbℓν in pp collisions at s=8  TeV

Battilana, C.;Bonacorsi, D.;Braibant-Giacomelli, S.;Campanini, R.;Capiluppi, P.;Castro, A.;Codispoti, G.;Cuffiani, M.;Fanfani, A.;Fasanella, D.;Guiducci, L.;Navarria, F.  L.;Rossi, A.  M.;Rovelli, T.;Siroli, G.  P.;Tosi, N.;
2017

Abstract

A measurement of the top quark mass ( M t ) in the dileptonic t ̄ t 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 ¼ e , μ ) 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 T 2 , 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 ν , that is combined with M T 2 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 ð stat Þ þ 0 . 89 − 0 . 93 ð syst Þ GeV
2017
Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2017). Measurement of the top quark mass in the dileptonic tt¯ decay channel using the mass observables Mbℓ , MT2 , and Mbℓν in pp collisions at s=8  TeV. PHYSICAL REVIEW D, 96(3), 1-31 [10.1103/PhysRevD.96.032002].
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; F...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/622464
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