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

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

Abstract licence: CC BY

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