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Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at √s = 7 TeV

The ALICE collaboration, Null
•
Adam, J.
•
Adamová, D.
altro
Zyzak, M.
2015
  • journal article

Periodico
JOURNAL OF HIGH ENERGY PHYSICS
Abstract
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 √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). D0, D+ and D∗+ mesons are measured in five pT 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 D0-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 pT > 1.3 GeV/c and |y| < 0.9, and extrapolated to pT > 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.
DOI
10.1007/JHEP09(2015)148
WOS
WOS:000362024600001
Archivio
http://hdl.handle.net/11368/2866026
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84942886883
http://link.springer.com/journal/13130
Diritti
open access
license:digital rights management non definito
FVG url
https://arts.units.it/bitstream/11368/2866026/2/Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at â s = 7 TeV.pdf
Soggetti
  • Hadron-Hadron Scatter...

  • Nuclear and High Ener...

Scopus© citazioni
39
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
75
Data di acquisizione
Mar 28, 2024
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