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

Adam, J.

doi:10.1007/JHEP09(2015)148

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

Journal Article · Tue Sep 22 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP09(2015)148· OSTI ID:1339375

Adam, J. ^[1]

Czech Technical University in Prague (Czech Republic). Faculty of Nuclear Sciences and Physical Engineering. et al.

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). D⁰, 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 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 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. Finally, the measurements are compared to PYTHIA 8, EPOS 3 and percolation calculations.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: The ALICE collaboration

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1339375

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 9; ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

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Heavy flavour measurements with the ALICE experiment at the LHC Vertesi, Robert arXiv https://doi.org/10.48550/arxiv.1904.06180	text	January 2019

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"Table 2" of "Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.69529.v1/t2 The current record is supplemented by this dataset	dataset	January 2016
"Table 1" of "Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.69529.v1/t1 The current record is supplemented by this dataset	dataset	January 2016
"Table 7" of "Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.69529.v1/t7 The current record is supplemented by this dataset	dataset	January 2016
"Table 4" of "Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.69529.v1/t4 The current record is supplemented by this dataset	dataset	January 2016
"Table 3" of "Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.69529.v1/t3 The current record is supplemented by this dataset	dataset	January 2016
"Table 6" of "Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.69529.v1/t6 The current record is supplemented by this dataset	dataset	January 2016
"Table 5" of "Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.69529.v1/t5 The current record is supplemented by this dataset	dataset	January 2016