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Correspondence between Color Glass Condensate and High-Twist Formalism

Journal Article · · Physical Review Letters
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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.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
US Department of Energy; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2587929
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 135
Country of Publication:
United States
Language:
English

Figures / Tables (3)

FIG. 1(p. 3)figure FIG. 1
FIG. 3(p. 5)figure FIG. 3
FIG. 2(p. 4)figure FIG. 2

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Related Subjects

Parton distribution functions
Perturbative QCD
QCD phenomenology
Relativistic heavy-ion collisions