Study of Z boson production in pp, pPb and PbPb collisions in CMS

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Zsigmond, Anna Julia^1

Wigner Research Center for Physics, Budapest, Hungary^1

关键词: Differential cross section;    Nuclear effects;    Nuclear modification factors;    Nucleon-nucleon collisions;    Parton distribution functions;    Pb-Pb collisions;    Pp collisions;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012011/pdf
DOI  :  10.1088/1742-6596/612/1/012011

来源: IOP

【 摘 要 】

The Z boson production is studied in PbPb and pp collisions at √sNN= 2:76 TeVand in pPb collisions at √sNN= 5:02 TeV using data collected by the CMS experiment at the LHC. The Z boson production is observed to be proportional to the number of elementary nucleon-nucleon collisions in both PbPb and pPb collisions. The measured differential cross sections as a function of transverse momentum and rapidity are in agreement with NLO pQCD calculations using different parton distribution functions with and without nuclear effects. Using the PbPb and pp data, the nuclear modification factor is presented as well as the forwardbackward ratio measured in pPb collisions.