Measurement of the top quark mass in the all-jets final state at [Formula: see text] and combination with the lepton+jets channel

在[公式:见正文]处测量全喷注末态的顶夸克质量,并与轻子+喷注通道相结合

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Abstract

A top quark mass measurement is performed using 35.9 fb-1 of LHC proton-proton collision data collected with the CMS detector at [Formula: see text] . The measurement uses the tt¯ all-jets final state. A kinematic fit is performed to reconstruct the decay of the tt¯  system and suppress the multijet background. Using the ideogram method, the top quark mass ( mt ) is determined, simultaneously constraining an additional jet energy scale factor ( JSF ). The resulting value of 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 tt¯ lepton+jets and all-jets final states is presented, using the same mass extraction method, and provides an mt measurement of 172.26 ± 0.07 (stat+JSF) ± 0.61 (syst) GeV . This is the first combined mt extraction from the lepton+jets and all-jets channels through a single likelihood function.

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