The VII-th International Conference on the Initial Stages of High-Energy Nuclear Collisions : Initial Stages 2023

Single-Inclusive Particle Production from pA Collision at Next-to-Leading Order

Not scheduled

2h

Københavns Universitetsbibliotek Nord

Poster Physics at low-x and gluon saturation Reception and poster session

Speaker

Yossathorn Tawabutr (University of Jyväskylä)

Description

We study the single-inclusive particle production from proton-nucleus collisions in the dilute-dense framework of the color glass condensate (CGC) at next-to-leading order (NLO) accuracy. In this regime, the cross section factorizes into hard impact factors and dipole-target scattering amplitude describing the eikonal interaction of the partons in the target color field. We combine, for the first time, the NLO impact factors with the dipole amplitude evolved consistently using the next-to-leading order Balitsky-Kovchegov (BK) equation.  Preliminary results in the $\pi^0$ cross section with all parton channels included show that it is crucial to consistently include all the ingredients at NLO accuracy in order to obtain a nuclear modification factor that is more qualitatively compatible with the LHCb data. In particular, the NLO evolution coupled to the leading order impact factor is shown to produce a large Cronin peak that is not visible in the LHC data. The Cronin peak becomes significantly suppressed once the NLO corrections are included for the impact factor. The importance of a proper choice of running coupling prescription will also be discussed.