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

• Verfasst von: Adam, Jaroslav [VerfasserIn]
• Verfasst von: Angelov, Venelin [VerfasserIn]
• Verfasst von: Busch, Oliver [VerfasserIn]
• Verfasst von: Fleck, Martin [VerfasserIn]
• Verfasst von: Glässel, Peter [VerfasserIn]
• Verfasst von: Klein, Jochen [VerfasserIn]
• Verfasst von: Knichel, Michael Linus [VerfasserIn]
• Verfasst von: Leardini, Lucia [VerfasserIn]
• Verfasst von: Lu, Xianguo [VerfasserIn]
• Verfasst von: Oyama, Ken [VerfasserIn]
• Verfasst von: Pachmayer, Yvonne C. [VerfasserIn]
• Verfasst von: Reygers, Klaus [VerfasserIn]
• Verfasst von: Schicker, Rainer [VerfasserIn]
• Verfasst von: Stachel, Johanna [VerfasserIn]
• Verfasst von: Stiller, Johannes Hendrik [VerfasserIn]
• Verfasst von: Völkl, Martin [VerfasserIn]
• Verfasst von: Windelband, Bernd [VerfasserIn]
• Verfasst von: Winn, Michael [VerfasserIn]
• Verfasst von: Zimmermann, Alice [VerfasserIn]
• Titel: Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at √s = 7 TeV
• Körperschaft: ALICE [VerfasserIn]
• Verf.angabe: The ALICE collaboration*
• E-Jahr: 2015
• Jahr: 22 September 2015
• Umfang: 46 S.
• Teil: year:2015
• Teil: number:9
• Teil: elocationid:148
• Teil: pages:1-46
• Teil: extent:46
• Fussnoten: *The ALICE collaboration: J. Adam, V. Anguelov, O. Busch, M. Fleck, P. Glaessel, J. Klein, M.L. Knichel, L. Leardini, X.-G. Lu, K. Oyama, Y. Pachmayer, K. Reygers, R. Schicker, J. Stachel, J. Stiller, M.A. Voelkl, B. Windelband, M. Winn, A. Zimmermann [und 955 weitere Personen] ; Gesehen am 21.07.2021 ; Im Titel steht der Buchstabe s unter dem Wurzelsymbol
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2015
• Band/Heft Quelle: (2015), 9, Artikel-ID 148, Seite 1-46
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP09(2015)148
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1764052269

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.