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Title: Evidence for Modification of $$b$$ Quark Hadronization in High-Multiplicity $pp$ Collisions at $$\sqrt{s}$$ = 13 TeV

Journal Article · · Physical Review Letters
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  1. Nikhef Theory Group, Amsterdam (Netherlands); LHCb Collaboration. et al.

The production rate of $$B^{0}_{s}$$ mesons relative to $B^0$ mesons is measured by the LHCb experiment in $pp$ collisions at a center-of-mass energy $$\sqrt{s}$$ = 13 TeV over the forward rapidity interval 2 < $$y$$ < 4.5 as a function of the charged particle multiplicity measured in the event. Evidence at the 3.4$$σ$$ level is found for an increase of the ratio of $$B^{0}_{s}$$ to $B^0$ cross sections with multiplicity at transverse momenta below 6 GeV /$$c$$, with no significant multiplicity dependence at higher transverse momentum. Comparison with data from $e^+$ $e^–$ collisions implies that the density of the hadronic medium may affect the production rates of $$B$$ mesons. This is qualitatively consistent with the emergence of quark coalescence as an additional hadronization mechanism in high-multiplicity collisions.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
LHCb Collaboration
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2283361
Report Number(s):
LA-UR--22-24581
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 131; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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