Forward rapidity J/psi production as a function of charged-particle multiplicity in pp collisions at root s=5.02 and 13 TeV



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU
et al (show 1006 more authors) (2022) Forward rapidity J/psi production as a function of charged-particle multiplicity in pp collisions at root s=5.02 and 13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2022 (6).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The production of J/<jats:italic>ψ</jats:italic> is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies <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> = 5.02 and 13 TeV. The J/<jats:italic>ψ</jats:italic> mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 <jats:italic>&lt; y &lt;</jats:italic> 4.0), whereas the charged-particle multiplicity density (d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub><jats:italic>/</jats:italic>d<jats:italic>η</jats:italic>) is measured at midrapidity (<jats:italic>|η| &lt;</jats:italic> 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>/〈d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>〉), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (〈<jats:italic>p</jats:italic><jats:sub>T</jats:sub>〉) of J/<jats:italic>ψ</jats:italic> in pp collisions exhibits an increasing trend as a function of d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>/〈d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>〉 showing a saturation towards high charged-particle multiplicities.</jats:p>

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron Scattering
Depositing User: Symplectic Admin
Date Deposited: 11 Oct 2022 13:09
Last Modified: 18 Jan 2023 20:37
DOI: 10.1007/JHEP06(2022)015
Open Access URL: https://link.springer.com/article/10.1007/JHEP06(2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3165356