Open-charm production as a function of charged particle multiplicity in pp collisions at = 7 TeV with ALICE

14th International Conference on Strangeness in Quark Matter

Bala, Renu^1

Department of Physics, University of Jammu, India^1

关键词: Charged particle multiplicities;    Heavy ion collision;    Open charm production;    Particle multiplicity;    Parton scattering;    Production cross section;    Quark-gluon plasma;    Scattering process;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012081/pdf
DOI  :  10.1088/1742-6596/509/1/012081

来源: IOP

【 摘 要 】

Heavy quarks (charm and beauty) are an effective tool to investigate the properties of the Quark-Gluon Plasma created in heavy-ion collisions as they are produced in initial hard scattering processes and as they experience all the stages of the medium evolution. The measurement of heavy-avour production cross sections in pp collisions at the LHC, besides providing a reference for heavy-ion studies, allows one to test perturbative QCD calculations. A brief review of ALICE results on the production of heavy-avoured hadrons measured from fully reconstructed hadronic decay topologies in pp collisions at S = 7 TeV is presented. Furthermore, heavy-avour production was also studied as a function of the particle multiplicity in pp collisions. This could provide insight into multi-parton scatterings. A measurement of the inclusive Jψ yield as a function of the charged-particle pseudorapidity density was performed by the ALICE Collaboration at the LHC in pp collisions at S = 7 TeV. An increase of the Jψ yield with increasing multiplicity was observed. In this context, the study of the yield of D mesons as a function of the charged-particle multiplicity could provide a deeper insight into charm-quark production in pp collisions. We will present the first results obtained for prompt D0, D+, and D+ mesons using hadronic decay channels at midrapidity in pp collisions at ps=7 TeV as a function of the charged-particle multiplicity. The prompt D-meson yields as a function of multiplicity are measured in different pT intervals. These yields will be compared to the results obtained for inclusive and non-prompt Jψ.