Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at root s=7 TeV
Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and
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Abstract
Prompt D meson and non-prompt J/psi yields are studied as a function of
the multiplicity of charged particles produced in inelastic
proton-proton collisions at a centre-of-mass energy of root s = 7 TeV.
The results are reported as a ratio between yields in a given
multiplicity interval normalised to the multiplicity-integrated ones
(relative yields). They are shown as a function of the multiplicity of
charged particles normalised to the average value for inelastic
collisions (relative charged-paarticle multiplicity). D-0, D+ and D{*}+
mesons are measured in five p(T) intervals from 1 GeV/c to 20 GeV/c and
for |y| < 0.5 via their hadronic decays. The D-meson relative yield is
found to increase with increasing charged-particle multiplicity. For
events with multiplicity six times higher than the average multiplicity
of inelastic collisions, a yield enhancement of a factor about 15
relative to the multiplicity-integrated yield in inelastic collisions is
observed. The yield enhancement is independent of transverse momentum
within the uncertainties of the measurement. The D-0-meson relative
yield is also measured as a function of the relative multiplicity at
forward pseudo-rapidity. The non-prompt J/psi, i.e. the B hadron,
contribution to the inclusive J/psi production is measured in the
di-electron decay channel at central rapidity. It is evaluated for p(T)
> 1.3 GeV/c and |y| < 0.9, and extrapolated to p(T) > 0. The fraction of
non-prompt J/psi the inclusive J/psi yields shows no dependence on the
charged-particle multiplicity at central rapidity. Charm and beauty
hadron relative yields exhibit a similar increase with increasing
charged-particle multiplicity. The measurements are compared to PYTHIA
8, EPOS 3 and percolation calculations.... Show more Show less