Year: 2024
Type: article
Abstract: The recently revised small- x helicity evolution [], resumming the double-logarithmic factor, α s ln 2 ( 1 / x ) , allows for the study of helicity distributions of quarks and gluons at small Bjorken x , corresponding to high center-of-mass energy. In this work, we calculate the moderate- x initial conditions in the regime, α s ln 2 ( 1 / x ) ∼ 1 , for the small- x helicity evolution using a light-front valence quark model of the proton, which provides additional physical information about the target. The perturbative emission and absorption of a gluon by the valence quarks are also included. The results, given in Eqs. (35), provide a new set of initial conditions with a significantly reduced number of free parameters than conventional models []. Consequently, the predictive power of small- x helicity evolution is expected to improve once the initial conditions from this work are incorporated. Published by the American Physical Society 2024
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1073255417, G14744916, G1607047924, G1819392837, G3111662533, G3142173218, G3362070546, The strong interaction at the frontier of knowledge: fundamental research and applications, G434337789, G435705506, NEW; HIGH-ENERGY QCD IN HEAVY-ION COLLISIONS; PI - JAMAL JALILIAN-MARIAN, G7451223319, G7567520714, QCD Matter in Extreme Conditions
OpenAlex ID: W4402678441