Measurements of the jet and vector boson in association with jets production, extraction ofαsand PDF constraints at CMS

Giulia D’Imperio

doi:10.1051/epjconf/20159504015

Abstract

We present CMS results about measurements of cross sections for jet production, which allow basic tests of perturbative QCD predictions. Results include recent jet, dijet, and multijet differential cross sections, and hadronic event shape measurements in pp collisions at a centre-of-mass energy of 7 and 8 TeV, using data collected in the CMS experiment. Total and differential cross section measurements of vector bosons production in association with jets and heavy flavour quarks are also presented. The experimental results are compared to leading and next-to-leading order calculations, both at parton level and in event generators where matrix element calculations are interfaced with parton showers. Recent CMS results related to the extraction of the strong coupling constant and extraction of αS and PDF are discussed.

Highlights

CMS has performed a wide range of studies of Standard Model physics using data collected at a center of mass energy of 7 and 8 TeV from 2010 to 2012
The production of Z and W bosons, which may be identified through their leptonic decays, is theoretically well described within the framework of the Standard Model
The measured jet cross section is corrected for detector effects and compared to predictions of perturbative QCD at next-to-leading order using various sets of parton distribution functions

Summary

Introduction

CMS has performed a wide range of studies of Standard Model physics using data collected at a center of mass energy of 7 and 8 TeV from 2010 to 2012 .Jets production is the most common process in a hadron collider and cross section measurements, both inclusive and differential, can provide stringent tests of perturbative QCD (pQCD). The presented analysis [1] data from proton-proton collisions at s = 8 TeV, corresponding to an integrated luminosity of 10.71 fb−1 are analyzed, and the cross section measurement is performed double-differentially as a function of the jet transverse momentum pT and the absolute jet rapidity |y| .

Results

Conclusion