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Hot spots and gluon field fluctuations as causes of eccentricity in small systems

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arxiv 2101.03791 v1 pith:V3XEXE43 submitted 2021-01-11 hep-ph nucl-th

classification hep-phnucl-th
keywords fluctuationsspotschargecoloreccentricitieseccentricityenergyfield
verification ladder T0 review T1 audit T2 compute T3 formal

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We calculate eccentricities in high energy proton-nucleus collisions, by calculating correlation functions of the energy density field of the Glasma immediately after the collision event at proper time tau = 0. We separately consider the effects of color charge and geometrical hot spot fluctuations, analytically performing the averages over both in a dilute-dense limit. We show that geometric fluctuations of hot spots inside the proton are the dominant source of eccentricity whereas color charge fluctuations only give a negligible correction. The size and number of hot spots are the most important parameters characterizing the eccentricities.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Saturation effects in exclusive vector meson production in DIS

    hep-ph 2025-11 conditional novelty 6.0 of 10

    A dense-limit CGC hotspot calculation shows saturation mildly suppresses exclusive vector meson cross sections in ep, with suppression growing at higher color-charge density.

  2. Exclusive $\mathrm{J}/\psi$ production off a dilute proton within a refined hotspot description

    hep-ph 2025-09 conditional novelty 6.0 of 10

    A hot-spot model with saturation-scale and hotspot-number fluctuations plus a relativistic wave-function correction reproduces HERA exclusive J/psi data, with saturation-scale fluctuations dominating.

  3. Collective dynamics in heavy and light-ion collisions -- I) Kinetic Theory vs. Hydrodynamics

    hep-ph 2024-11 conditional novelty 6.0 of 10

    Event-by-event simulations show elliptic flow in heavy and light ion collisions follows a universal opacity-dependent response curve; hydrodynamics is accurate only above opacity around 3, and oxygen collisions expose...

  4. Effective theories for nuclei at high energies

    hep-ph 2025-02 unverdicted novelty 1.0 of 10

    This paper reviews the Color Glass Condensate effective theory, covering its foundations, its role in deep inelastic scattering, and its use in setting initial conditions for heavy-ion collisions.

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