Year: 2025
Type: letter
Abstract: The color glass condensate (CGC) effective theory and the collinear factorization at high twist (HT) are two well-known frameworks describing perturbative QCD multiple scatterings in nuclear media. It has long been recognized that these two formalisms have their own domain of validity in different kinematic regions. Taking direct photon production in proton-nucleus collisions as an example, we clarify for the first time the relation between CGC and HT at the level of a physical observable. We show that the CGC formalism beyond shock-wave approximation, and with the Landau-Pomeranchuk-Migdal interference effect is consistent with the HT formalism in the transition region where they overlap. Such a unified picture paves the way for mapping out the phase diagram of parton density in nuclear medium from dilute to dense region.
Source: Physical Review Letters
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
Awards: G1286236842, G1863003419, G222768804, G2543024069, G3083819904, CSSI: Frameworks: X-Ion Collisions with a Statistically and Computationally Advanced Program Envelope (X-SCAPE), G3759592126, G4145298365, G42916606, G4599464876, 强相互作用物质的硬探针信号研究, NUCLEAR PHYSICS AT EXTREME ENERGY DENSITY, NUCLEAR PHYSICS AT HIGH ENERGY DENSITY, G704498496, CAREER: Hadron's Transverse Structure and Associated QCD Dynamics, G7916857574, G7940197049, G8895878381, G969889393
OpenAlex ID: W4412484905