Run-1 Single-top measurements at CMS

TL;DR

This paper reviews CMS's measurements of single top quark production modes during Run-1 of the LHC, highlighting precise cross-section measurements, property determinations, and the first observation of the tW process.

Contribution

It presents the first detailed measurements and observations of single top production modes at the LHC, including the tW process and property measurements using Run-1 data.

Findings

Precise measurement of t-channel cross-section.

First observation of tW associated production.

Limits set on s-channel production cross section.

Abstract

The Run-1 of the LHC was very successful for single top physics. The main single top production mode, $t-$channel, is now well established. The $t-$channel cross-section was measured with unprecedented precision and $t-$channel events have been used for the first time to perform measurements of standard model properties, such as: $|V_{tb}|$, top quark polarization, or $W$-helicity fractions. The associated production with a $W$ boson, $tW$, has a large cross section at the LHC and has been observed by CMS for the first time. Finally, the $s-$channel also has been studied and limits set on its production cross section. Single top results produced by the CMS experiment at 7 and 8 TeV are presented in the following.