Speaker
Gian Michele Innocenti
(Universita e INFN (IT))
Description
In hadron collisions at the LHC, charm quarks are produced almost exclusively in initial hard parton scattering processes because of their large mass. Therefore, charm hadrons are excellent probes to study the dynamics of the hot and dense Quark-Gluon Plasma (QGP) produced in such collisions. For the quantitative interpretation of measurements in heavy-ion collisions it is mandatory to establish a baseline in proton-proton (pp) collisions where the elementary charm production mechanism can be investigated.
In a recent measurement with ALICE, the J/Psi yield in pp collisions at c.m. energy of 7 TeV was observed to increase with increasing
charged particle multiplicity, which might indicate that multiparton interactions are also relevant for heavy-flavour production.
To further substantiate this finding it is crucial to investigate the multiplicity dependence of the total charm yield in pp collisions,
e.g. via the measurement of D mesons.
We present the current results on the charged particle multiplicity dependence of D0, D+, and D*+ meson yields in pp collisions at
7 TeV c.m. energy. The D mesons were reconstructed exclusively with ALICE in their hadronic decay channels at mid-rapidity in various
transverse momentum intervals. The results will be discussed in the context of the previous measurements of J/Psi yields.
Authors
Mr
Aamer Wali Rauf
(COMSATS Institute of Information Technology (CIIT), Islamabad, Pakistan)
Gian Michele Innocenti
(Universita e INFN (IT))