Charm production in high multiplicity pp events

32nd Winter Workshop on Nuclear Dynamics

Werner, K.^1 ; Guiot, B.^1,2 ; Karpenko, Iu.^3,4,5 ; Pierog, T.^6 ; Sophys, G.^1

SUBATECH, University of Nantes, IN2P3/CNRS, EMN, Nantes, France^1

Universidad Tcnica Federico Santa Mara, Valparaiso, Chile^2

FIAS, Johann Wolfgang Goethe Universitaet, Frankfurt am Main, Germany^3

Bogolyubov Institute for Theoretical Physics, Kiev 143

03680, Ukraine^4

INFN, Sezione di Firenze, Via G. Sansone1, Sesto Fiorentino (Firenze)

I-50019, Italy^5

Karlsruhe Inst. of Technology, KIT, Campus North, Inst. F. Kernphysik, Germany^6

关键词: Charged particle multiplicities;    D-mesons;    High multiplicity;    Hydrodynamic expansion;    Multiplicity fluctuations;    Proton proton collisions;    Proton scattering;    Reaction mechanism;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/736/1/012009/pdf
DOI  :  10.1088/1742-6596/736/1/012009

来源: IOP

【 摘 要 】

Studying proton-proton scattering at 7 TeV, the ALICE collaboration found the unexpected result that the D meson multiplicity increases more than linear as a function of the charged particle multiplicity. We try to understand this behavior using the EPOS3 approach. Two issues play an important role in this context: multiple scattering, in particular its impact on multiplicity fluctuations, and the collective hydrodynamic expansion. These data contain therefore valuable information about very basic features of the reaction mechanism in proton- proton collisions.