Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV - INSPIRE

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Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $\sqrt{s}=7$ TeV

ALICE

Collaboration

May 4, 2015

39 pages

Published in:

JHEP 09 (2015) 148

Published: Sep 22, 2015

e-Print:

1505.00664 [nucl-ex]

DOI:

10.1007/JHEP09(2015)148

Report number:

CERN-PH-EP-2015-091

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

Prompt D meson and non-prompt J/ψ 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

\sqrt{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-particle 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/ψ, i.e. the B hadron, contribution to the inclusive J/ψ 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/ψ in the inclusive J/ψ 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.

Note:

39 pages, 11 captioned figures, 2 (+6) tables, authors from page 34, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1599

Hadron-Hadron Scattering
charm
bottom
production
rapidity
charged particle: multiplicity
yield: enhancement
p p: scattering
ratio
hadron

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