Measurements of single top quark cross sections at 13 TeV with the CMS experiment

TL;DR

This paper reports recent measurements of single top quark production cross sections at 13 TeV with the CMS experiment, including inclusive, differential, and associated production with a Z boson, all consistent with the standard model.

Contribution

It provides new measurements of single top quark cross sections in various modes and a search for top-Z associated production at 13 TeV with CMS.

Findings

Inclusive t-channel cross section: 238 ± 32 pb

tW production cross section: 63.1 ± 6.6 pb

Single top + Z boson production observed with 3.7 sigma significance

Abstract

An overview of recent measurements of inclusive and differential single top quark cross sections at 13 TeV with the CMS experiment is given in this note. This includes measurements targeting the $t$-channel and tW production modes resulting in inclusive cross sections of $\sigma_{t\mathrm{\mbox{-}ch.}}=238\pm32~\mathrm{pb}$ and $\sigma_\mathrm{tW}=63.1\pm6.6~\mathrm{pb}$ respectively. In addition, the $t$-channel cross section has been measured differentially as a function of the top quark transverse momentum and rapidity. The results are found in agreement with the standard model expectations. Furthermore, a search for single top quark production in association with a Z boson is detailed which yields an observed (expected) significance of 3.7 (3.1) standard deviations.