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Investigating the broadening phenomenon in two-particle correlations induced by gluon saturation

Journal Article · · Physical Review. D.
DOI:https://doi.org/10.1103/7jxl-8pzn· OSTI ID:3003362
 [1];  [2];  [3];  [3]
  1. Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
  2. Shandong Univ., Qingdao, Shandong (China)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States)
+ Show Author Affiliations
It has been found that the gluon density inside the proton grows rapidly at small momentum fractions. Quantum chromodynamics (QCD) predicts that this growth can be regulated by nonlinear effects, ultimately leading to gluon saturation. Within the color glass condensate framework, nonlinear QCD effects are predicted to suppress and broaden back-to-back angular correlations in collisions involving heavy nuclei. While suppression has been observed in various experiments in 𝑑/𝑝 + A collisions compared to 𝑝 + 𝑝 collisions, the predicted broadening remains unobserved. This study investigates the contributions of intrinsic transverse momentum (π‘˜π‘‡), which is associated with saturation physics, as well as parton showers and transverse motion from fragmentation (𝑝$$^{frag}_{𝑇}$$), which are not saturation dependent, to the width of the correlation function. Our findings show that the non-saturation dependent effects, especially the initial-state parton shower and 𝑝$$^{frag}_{𝑇}$$, which occur independently of the collision system, smear the back-to-back correlation more than gluon saturation does, making the broadening phenomenon difficult to observe.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)
Grant/Contract Number:
SC0012704
OSTI ID:
3003362
Report Number(s):
BNL--229154-2025-JAAM
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 112; ISSN 2470-0010; ISSN 2470-0029
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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