Measurement of D-meson production versus multiplicity in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

Submission Date: 
23/02/2016
Article Information
Submission Form
System: 
p-Pb
Energy: 
5.02 TeV
Abstract Plain Text: 

The measurement of prompt D-meson production as a function of multiplicity in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV with the ALICE detector at the LHC is reported. D$^0$, D$^+$ and D*$^+$ mesons are reconstructed via their hadronic decay channels in the centre-of-mass rapidity range $-0.96< y_{\mathrm{cms}}<0.04$ and transverse momentum interval $1<p_{\rm T}<24$ GeV/$c$. The multiplicity dependence of D-meson production is examined by either comparing yields in p-Pb collisions in different event classes, selected based on the multiplicity of produced particles or zero-degree energy, with those in pp collisions, scaled by the number of binary nucleon--nucleon collisions (nuclear modification factor); as well as by evaluating the per-event yields in p-Pb collisions in different multiplicity intervals normalised to the multiplicity-integrated ones (relative yields). The nuclear modification factors for  D$^0$, D$^+$ and D*$^+$ are consistent with one another. The D-meson nuclear modification factors as a function zero-degree energy are compatible with unity in the measured $p_{\rm T}$ regions and event classes within uncertainties. The relative D-meson yields, calculated in various $p_{\rm T}$ intervals, increase as a function of the charged-particle multiplicity. The results are compared with the equivalent pp measurements at $\sqrt{s}=7$ TeV as well as with EPOS 3 calculations.

PF talk: https://indico.cern.ch/event/306368/session/1/contribution/1/attachments/583284/802877/PF_D2H_pPb_260914.pdf
PB talk: https://indico.cern.ch/event/329639/#preview:882070