# Measurement of the top quark mass in the dileptonic $t\overline{t}$ decay channel using the mass observables $M_{b\ell}$, $M_{T2}$, and $M_{b\ellν}$ in pp collisions at $\sqrt{s}=8$ TeV

CMS Collaboration; Canelli, Florencia; Kilminster, Benjamin; Aarestad, Thea; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hinzmann, Andreas; Hreus, Tomas; Ngadiuba, Jennifer; Pinna, Deborah; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Zucchetta, Alberto; et al (2017). Measurement of the top quark mass in the dileptonic $t\overline{t}$ decay channel using the mass observables $M_{b\ell}$, $M_{T2}$, and $M_{b\ellν}$ in pp collisions at $\sqrt{s}=8$ TeV. Physical Review. D, Particles, fields, gravitation and cosmology, D96(3):032002.

## Abstract

A measurement of the top quark mass ($M_t$) in the dileptonic $t\overline{t}$ 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 $\pm$ 0.5 fb$^{−1}$. Events are selected with two oppositely charged leptons ($\ell = e, \mu$) 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, $M_{b\ell}$, and a “stransverse mass” observable, MT2, are employed in a simultaneous fit to determine the value of Mt and an overall jet energy scale factor (JSF). A complementary approach is used to construct an invariant mass observable, $M_{b\ellν}$, 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 $\pm$ 0.18(stat) $^{+0.89}_{−0.93}$(syst)  GeV.

## Abstract

A measurement of the top quark mass ($M_t$) in the dileptonic $t\overline{t}$ 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 $\pm$ 0.5 fb$^{−1}$. Events are selected with two oppositely charged leptons ($\ell = e, \mu$) 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, $M_{b\ell}$, and a “stransverse mass” observable, MT2, are employed in a simultaneous fit to determine the value of Mt and an overall jet energy scale factor (JSF). A complementary approach is used to construct an invariant mass observable, $M_{b\ellν}$, 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 $\pm$ 0.18(stat) $^{+0.89}_{−0.93}$(syst)  GeV.

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