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

Russo, R. and Abelev, B. and Adam, J. and Adamová, D. and Aggarwal, M. M. and Aglieri, Rinella G. and Agnello, M. and Agostinelli, A. and Agrawal, N. and Ahammed, Z. and Ahmad, N. and Ahmed, I. and Ahn, S. U. and Ahn, S. A. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Alam, S. N. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Alves, Garcia Prado C. and Andrei, C. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Varga-Kőfaragó, Mónika and Lévai, Péter and Oláh, László and Pochybova, Sona (2014) Measurement of heavy-flavour production as a function of multiplicity in pp and p–Pb collisions with ALICE. NUCLEAR PHYSICS A, 931. pp. 552-557. ISSN 0375-9474

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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 √s = 7 TeV and p–Pb collisions at √sNN=5.02 TeV recorded with the ALICE detector in 2010 and 2013, respectively. D0, D+ and D∗+ mesons are reconstructed from their hadronic decay channels in the central rapidity region, and their production yields are measured in various multiplicity and pT intervals. The per-event yields of D mesons in the various multiplicity intervals, normalized to their multiplicity-integrated value, and their evolution with pT 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 D mesons in p–Pb collisions, defined as the ratio of the D-meson yields in p–Pb and pp collisions scaled by the average number of binary collisions 〈Ncoll〉, 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.

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