6533b7cffe1ef96bd1258f3b

RESEARCH PRODUCT

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

Tuomas LappiTuomas LappiSami Petteri DemirciSami Petteri DemirciSören Schlichting

subject

Nuclear TheoryField (physics)ProtonAZIMUTHAL ANISOTROPIESFLOWmedia_common.quotation_subjectFOS: Physical sciencesHot spot (veterinary medicine)hiukkasfysiikka114 Physical sciences01 natural sciencesNuclear Theory (nucl-th)High Energy Physics - Phenomenology (hep-ph)0103 physical sciencesProper timeEccentricity (behavior)LONG-RANGEHARMONICSNuclear Experiment010306 general physicsPLUS PB COLLISIONSGluon fieldmedia_commonPROTON-LEAD COLLISIONSPhysics010308 nuclear & particles physicskvarkki-gluoniplasmaANGULAR-CORRELATIONSComputational physicsHigh Energy Physics - PhenomenologyNEAR-SIDEAstrophysics::Earth and Planetary AstrophysicsHIGH TRANSVERSE-MOMENTUMPPBEvent (particle physics)Color charge

description

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.

yearjournalcountryeditionlanguage
2021-05-21Physical Review D
https://doi.org/10.1103/physrevd.103.094025