# Measurement of the top quark mass in the all-jets final state at $\sqrt{s}=13\,\text {TeV}$ and combination with the lepton+jets channel

CMS Collaboration; Canelli, Maria Florencia; Kilminster, Benjamin; Aarrestad, Thea K; Brzhechko, Danyyl; Caminada, Lea; de Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hreus, Tomas; Leontsinis, Stefanos; Mikuni, Vinicius Massami; Neutelings, Izaak; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Wertz, Sebastien; Zucchetta, Alberto; et al (2019). Measurement of the top quark mass in the all-jets final state at $\sqrt{s}=13\,\text {TeV}$ and combination with the lepton+jets channel. European Physical Journal C - Particles and Fields, C79(4):313.

## Abstract

A top quark mass measurement is performed using 35.9 ${\,\text {fb}^{-1}}$ of LHC proton–proton collision data collected with the CMS detector at $\sqrt{s}=13\,\text {TeV}$. The measurement uses the ${\mathrm {t}\overline{\mathrm {t}}}$ all-jets final state. A kinematic fit is performed to reconstruct the decay of the ${\mathrm {t}\overline{\mathrm {t}}}$ system and suppress the multijet background. Using the ideogram method, the top quark mass $(m_{\mathrm {t}})$ is determined, simultaneously constraining an additional jet energy scale factor $(\text {JSF})$. The resulting value of $m_{\mathrm {t}} =172.34\pm 0.20\,\text {(stat+JSF)} \pm 0.70\,\text {(syst)} \,\text {GeV}$ is in good agreement with previous measurements. In addition, a combined measurement that uses the ${\mathrm {t}\overline{\mathrm {t}}}$ lepton+jets and all-jets final states is presented, using the same mass extraction method, and provides an $m_{\mathrm {t}}$ measurement of $172.26\pm 0.07\,\text {(stat+JSF)} \pm 0.61\,\text {(syst)} \,\text {GeV}$. This is the first combined $m_{\mathrm {t}}$ extraction from the lepton+jets and all-jets channels through a single likelihood function.

## Abstract

A top quark mass measurement is performed using 35.9 ${\,\text {fb}^{-1}}$ of LHC proton–proton collision data collected with the CMS detector at $\sqrt{s}=13\,\text {TeV}$. The measurement uses the ${\mathrm {t}\overline{\mathrm {t}}}$ all-jets final state. A kinematic fit is performed to reconstruct the decay of the ${\mathrm {t}\overline{\mathrm {t}}}$ system and suppress the multijet background. Using the ideogram method, the top quark mass $(m_{\mathrm {t}})$ is determined, simultaneously constraining an additional jet energy scale factor $(\text {JSF})$. The resulting value of $m_{\mathrm {t}} =172.34\pm 0.20\,\text {(stat+JSF)} \pm 0.70\,\text {(syst)} \,\text {GeV}$ is in good agreement with previous measurements. In addition, a combined measurement that uses the ${\mathrm {t}\overline{\mathrm {t}}}$ lepton+jets and all-jets final states is presented, using the same mass extraction method, and provides an $m_{\mathrm {t}}$ measurement of $172.26\pm 0.07\,\text {(stat+JSF)} \pm 0.61\,\text {(syst)} \,\text {GeV}$. This is the first combined $m_{\mathrm {t}}$ extraction from the lepton+jets and all-jets channels through a single likelihood function.

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