Multiplicity dependence of σψ(2S)/σJ/ψ in pp collisions at $$ \sqrt{s} $$ = 13 TeV



Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C, Aidala, CA
et al (show 1097 more authors) (2024) Multiplicity dependence of σψ(2S)/σJ/ψ in pp collisions at $$ \sqrt{s} $$ = 13 TeV. Journal of High Energy Physics, 2024 (5). 243-. ISSN 1126-6708, 1029-8479

Access the full-text of this item by clicking on the Open Access link.

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The ratio of production cross-sections of <jats:italic>ψ</jats:italic>(2<jats:italic>S</jats:italic>) over <jats:italic>J/ψ</jats:italic> mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> </jats:alternatives> </jats:inline-formula> = 13 TeV is measured with a data sample collected by the LHCb detector, corresponding to an integrated luminosity of 658 pb<jats:sup> <jats:italic>−</jats:italic>1</jats:sup>. The ratio is measured for both prompt and non-prompt <jats:italic>ψ</jats:italic>(2<jats:italic>S</jats:italic>) and <jats:italic>J/ψ</jats:italic> mesons. When there is an overlap between the rapidity ranges over which multiplicity and charmonia production are measured, a multiplicity-dependent modification of the ratio is observed for prompt mesons. No significant multiplicity dependence is found when the ranges do not overlap. For non-prompt production, the <jats:italic>ψ</jats:italic>(2<jats:italic>S</jats:italic>)-to-<jats:italic>J/ψ</jats:italic> production ratio is roughly independent of multiplicity, irrespective of the rapidity range over which the multiplicity is measured. The results are compared to predictions of the co-mover model and agree well except in the low multiplicity region. The ratio of production cross-sections of <jats:italic>ψ</jats:italic>(2<jats:italic>S</jats:italic>) over <jats:italic>J/ψ</jats:italic> mesons are cross-checked with other measurements in di-lepton channels and found to be compatible.</jats:p>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2024 08:10
Last Modified: 15 Mar 2025 02:48
DOI: 10.1007/jhep05(2024)243
Open Access URL: https://link.springer.com/article/10.1007/JHEP05(2...
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3184178