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

Jan 11, 2021
23 pages
Published in:
  • Phys.Rev.D 103 (2021) 9, 094025
  • Published: May 22, 2021
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Abstract: (APS)
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 τ=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.
Note:
  • 21 pages, 9 figures
  • Strong Interactions
  • charge: color
  • fluctuation: geometrical
  • charge: fluctuation
  • energy: correlation function
  • energy: density
  • effect: color
  • energy: high
  • p nucleus: scattering
  • glasma