Accessing subnuclear fluctuations and saturation with multiplicity dependent $J/\psi$ production in p+p and p+Pb collisions
| Autor: | Farid Salazar, Björn Schenke, Alba Soto-Ontoso |
|---|---|
| Přispěvatelé: | Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
p p: scattering Nuclear Theory [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] charm: pair production p: fluctuation Computer Science::Digital Libraries fragmentation function heavy quark: production coupling constant: energy dependence Nuclear Experiment p nucleus: scattering quantum chromodynamics: nonrelativistic color: evaporation multiplicity: fluctuation hadron: multiplicity High Energy Physics::Phenomenology gluon multiplicity: dependence Balitsky-Kovchegov equation High Energy Physics - Phenomenology CERN LHC Coll rapidity correlation [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] color glass condensate High Energy Physics::Experiment J/psi(3100): production scale: saturation dipole hadronization |
| Zdroj: | Physics Letters Phys.Lett.B Phys.Lett.B, 2022, 827, pp.136952. ⟨10.1016/j.physletb.2022.136952⟩ |
| DOI: | 10.1016/j.physletb.2022.136952⟩ |
| Popis: | We study the production of $J/\psi$ vector mesons as a function of charged hadron multiplicity in p+p and p+Pb collisions at LHC energies. We employ the color glass condensate framework, using running coupling Balitsky-Kovchegov evolved dipole amplitudes, to compute gluon and $c\bar{c}$-pair production. We use fragmentation functions to obtain charged hadrons, and explore two different hadronization schemes for the $J/\psi$: non-relativistic quantum chromodynamics and the improved color evaporation model. In our framework, event-by-event multiplicity fluctuations of both hadrons and $J/\psi$ are driven by geometric and saturation scale normalization fluctuations. Studying the correlation between $J/\psi$ and hadron multiplicity, we show that the characteristic difference between forward and backward rapidity in p+Pb collisions is a result of different degrees of saturation probed at different rapidities. We demonstrate that experimental data on heavy-flavor production as a function of event activity provide stringent constraints on the fluctuating proton structure. Comment: 11 pages, 8 figures |
| Databáze: | OpenAIRE |
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