Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at √s = 7 TeV
ALICE Collaboration. (2015). Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at √s = 7 TeV. Journal of High Energy Physics, 2015(9), Article 148. https://doi.org/10.1007/JHEP09(2015)148
Julkaistu sarjassa
Journal of High Energy PhysicsTekijät
Päivämäärä
2015Tekijänoikeudet
© CERN, for the benefit of the ALICE Collaboration.
Article funded by SCOAP3. JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0
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 centreof-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.
...
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Springer Berlin HeidelbergISSN Hae Julkaisufoorumista
1126-6708Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/25232336
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Ellei muuten mainita, aineiston lisenssi on © CERN, for the benefit of the ALICE Collaboration.
Article funded by SCOAP3. JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0
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