Measurement of heavy-flavour production as a function of multiplicity in pp and p-Pb collisions with ALICE

Abstract

In these proceedings results are presented from the measurement of open heavy-flavour production as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}$ = 7 TeV and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=5.02 TeV recorded with the ALICE detector in 2010 and 2013, respectively. ${\mathrm{D}}^0$, ${\mathrm{D}}^{+}$ and ${\mathrm{D}}^{\ast +}$ mesons are reconstructed from their hadronic decay channels in the central rapidity region, and their production yields are measured in various multiplicity and $p_{\mathrm{T}}$ intervals. The per-event yields of $\mathrm{D}$ mesons in the various multiplicity intervals, normalized to their multiplicity-integrated value, and their evolution with $p_{\mathrm{T}}$ are measured for pp and p-Pb collisions to study the contribution of Multi-Parton Interactions (MPIs) to open charm production in the two systems. The nuclear modification factor of $\mathrm{D}$ mesons in p-Pb collisions, defined as the ratio of the $\mathrm{D}$-meson yields in p-Pb and pp collisions scaled by the average number of binary collisions $<N_{\mathrm{coll}}>$, is discussed in terms of its dependence on the event activity. Several experimental estimators of the event activity are used in order to assess the role of kinematic biases.

References in corpus (8)

• Centrality determination of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV with ALICE
• Measurement of charm production at central rapidity in proton-proton collisions at $\sqrt{s}=2.76$ TeV
• Observation of double charm production involving open charm in pp collisions at $\sqrt{s}$=7 TeV
• J/psi Production as a Function of Charged Particle Multiplicity in pp Collisions at sqrt{s} = 7 TeV
• Multiplicity dependence of two-particle azimuthal correlations in pp collisions at the LHC
• Jet and underlying event properties as a function of particle multiplicity in proton-proton collisions at sqrt(s) = 7 TeV
• Measurements of the heavy-flavour nuclear modification factor in p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV with ALICE at the LHC
• Centrality Dependence of Particle Production in p--A collisions measured by ALICE

Cited by in corpus (2)

• Overview of ALICE Results at Quark Matter 2014
• Correlation between heavy flavour production and multiplicity in pp and p-Pb collisions at high energy in the multi-pomeron exchange model