Measurement of the top-quark mass with all-jets final states in pp collisions at 7 TeV

5th International Workshop on Top Quark Physics

Schlieckau, Eike^1

Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany^1

关键词: Event selection;    Final state;    Integrated luminosity;    Mass resolution;    Mixing techniques;    Pp collisions;    Top quarks;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012022/pdf
DOI  :  10.1088/1742-6596/452/1/012022

来源: IOP

【 摘 要 】

A measurement is presented of the top-quark mass in the all-jets channel using a sample of t candidate events requiring at least six jets in the final state. The data have been collected by CMS in pp collisions at 7 TeV and correspond to an integrated luminosity of 3.54 fb-1. In this channel, a very tight event selection is needed to reduce the huge amount of multi-jet events. In addition, the signal fraction and mass resolution is improved by the use of a kinematic fit. An ideogram method is used to measure the top-quark mass with the background estimated from data through an event mixing technique. The top-quark mass is measured to be mt 173.5 ± 0.7 (stat.) ± 1.3 (syst.) GeV.