Early b physics at CMS

TL;DR

This paper reports early B physics results from CMS at the LHC, including measurements of di-muon resonances, inclusive B production, and comparisons with theoretical predictions, based on initial low-luminosity data.

Contribution

First measurements of B physics observables at CMS with early LHC data, including di-muon resonances and inclusive B production using novel muon and b-tagging techniques.

Findings

Measured di-muon resonance cross-sections from J/psi and Y decays.

Reported two independent inclusive B production measurements.

Compared experimental results with LO and NLO theoretical predictions.

Abstract

The CMS experiment at the Large Hadron Collider collected in the first months of operation a luminosity of about 300/nb. The first results in the context of the B physics obtained with these data are presented. The di-muon resonances from J/psi and Y decays are presented and their total and differential cross-sections measured. The inclusive B production have also being investigated and two independent measurements are reported. Muons in jets are used as a way to identify events with B content, the kinematic properties (ptRel) of the muons are used to separate the B production from other processes producing muons in jets. The second measurement of inclusive B production is done using b-tagging techniques and higher energy jets. The two measurements cover different phase spaces, comparison with LO and NLO prediction are also presented.