Measurement of the Top Quark Mass From Dileptonic $t\bar{t}$ Decays With 2012 CMS Data

TL;DR

This paper reports a precise measurement of the top quark mass using dileptonic decay channels in CMS data at 8 TeV, employing the Analytical Matrix Weighting Technique and performing the first blind measurement at CMS.

Contribution

It introduces the first blind top quark mass measurement at CMS using the AMWT method on dileptonic decay data at 8 TeV.

Findings

Top quark mass measured as 172.47 GeV

Statistical uncertainty of 0.17 GeV

Systematic uncertainty of 1.40 GeV

Abstract

We present a measurement of the top quark mass using 19.7 $\pm$ 0.5 fb$^{-1}$ of $\sqrt{s} = 8$ TeV CMS data. In particular, we study dileptonic $t\bar{t}$ decays, in which a top-antitop pair decays to a final state containing two electrons or muons. We use the Analytical Matrix Weighting Technique (AMWT), and have performed the first blind top mass measurement at CMS. The mass of the top quark is measured as $m_t = 172.47 \pm 0.17(\text{stat}) \pm 1.40(\text{syst})$ GeV.