Jet measurements in proton-proton collisions with the ALICE experiment at LHC

Workshop for Young Scientists on the Physics of Ultrarelativistic Nucleus–Nucleus Collisions 2012

Vajzer, Michal^1,2

Nuclear Physics Institute, Prague, Czech Republic^1

Faculty of Nuclear Sciences and Physical Engineering, CTU, Prague, Czech Republic^2

关键词: Charged particle multiplicities;    Detector effects;    High energy heavy-ion collision;    Jet measurements;    Perturbative quantum chromodynamics;    Proton proton collisions;    Unfolding method;    Vacuum measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/446/1/012004/pdf
DOI  :  10.1088/1742-6596/446/1/012004

来源: IOP

【 摘 要 】

The study of jets, collimated sprays of particles associated with hard partons, is an important tool in testing perturbative quantum chromodynamics (pQCD) and probing hot and dense nuclear matter created in high energy heavy-ion collisions. Jets enable the study of hard scatterings, fragmentation and hadronisation and their modi-cation in the presence of a nuclear medium with respect to baseline vacuum measurements, which is acquired from jet measurements in proton-proton collisions. We have analysed data from proton-proton collisions at √ s= 7 TeV measured by the ALICE experiment at the LHC and reconstructed the inclusive spectra of charged particle jets at midrapidity using anti-kT clustering algorithm. We present the jet spectra corrected for detector effects using several unfolding methods. Furthermore, we examine various properties of jets, such as their charged particle multiplicity and jet shapes.