PoS - Proceedings of Science
Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T07: Top and Electroweak Physics
Precision measurement of the top quark mass with single top events at CMS
M. Kumar
Full text: pdf
Pre-published on: January 17, 2022
Published on:
Abstract
A measurement of the top quark mass in single top events produced in the $t$-channel at the CMS experiment is presented. The $t$-channel is the dominant process for single top quark production at the LHC. The $t$-channel process provides a unique phase space with different color reconnection conditions than that of $\mathrm{t}\bar{\mathrm{t}}$ events, which are are exploited for the most precise measurements of the top-quark mass. The final state comprises a single top quark along with a light quark giving rise to at least two jets, (one of which arises from the hadronization of a b quark), an isolated high-momentum lepton (electron or muon), and large missing transverse momentum due to an escaping neutrino from the W boson decay. The study is based on proton-proton collision data, equivalent to $35.9$ $\mathrm{fb}^{−1}$ integrated luminosity, recorded at $\sqrt{s}$ = 13 TeV by the CMS experiment during 2016. Dominant standard model backgrounds are studied in different kinematic regions depending on the number of b-tagged quarks and light-flavor jets in the final state. A multivariate technique relying on boosted decision trees is employed to optimally separate the signal from backgrounds. The top quark mass is reconstructed using kinematic information of the final-state objects, namely the charged lepton, missing transverse momentum, and jets. We obtain the top quark mass $m_\mathrm{t}=172.13^{+0.69}_{−0.70}$ GeV, by fitting the reconstructed mass distribution using an appropriate combination of parametric shapes.}
DOI: https://doi.org/10.22323/1.398.0440
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.