Fluctuations of the multiplicity of produced particles in onium-nucleus collisions

Abstract

We address the general features of event-by-event fluctuations of the multiplicity of gluons produced in the scattering of a dilute hadron off a large nucleus at high energy in the fragmentation region of the dilute hadron. We relate these fluctuations to the stochasticity of the number of quanta contained in the hadron at the time of the interaction. For simplicity, we address the ideal case in which the hadron is an onium, and investigate different kinematical regimes in rapidity and onium size. We show that at large rapidity, the multiplicity distribution exhibits an exponential tail in the large-multiplicity region, which is qualitatively consistent with the proton-nucleus data. But interestingly enough, the exponential shape is determined by confinement.

arXiv comment21 pages, 4 figures

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Cited by in corpus (8)

• Review of proton and nuclear shape fluctuations at high energy
• Relating centrality to impact parameter in nucleus-nucleus collisions
• Reconstructing the impact parameter of proton-nucleus and nucleus-nucleus collisions
• Exploring the Collective Phenomenon at the Electron-Ion Collider
• Fluctuations of the gluon distribution from the small-x effective action
• Gluon density fluctuations in dilute hadrons
• Rare fluctuations of the $S$-matrix at NLO in QCD
• Multiplicity fluctuations and correlations in 5.02 TeV p+Pb collisions at zero impact parameter