Abstract
Prompt photon production in hadronic collisions at the RHIC and the LHC energies is investigated within the QCD color dipole approach. Predictions for the nuclear modification factor in $pA$ collisions are evaluated based on parton saturation framework and the results are compared to the experimental measurements as a function of the photon transverse momentum at different rapidity bins. The reliability of the models is performed with the data from PHENIX, ATLAS, and ALICE Collaborations. Moreover, we show that the observed $x_T$-scaling of prompt photon production in $pp$ and $pA$ collisions can positively be addressed in the QCD color dipole formalism.
Highlights
In high-energy collisions involving a nuclei, the presence of effects associated with the nuclear environment modify the behavior of the partonic distributions
A detailed understanding of the initial- and final-state effects associated with the stages of the collision is crucial to describe the data from heavy-ion collisions (HICs) at the BNL Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC)
Proton-nucleus collisions can be used as a probe of the nuclear effects, since the formation of a quark-gluon deconfined medium known as Quark-Gluon Plasma (QGP) is not expected in this case
Summary
In high-energy collisions involving a nuclei, the presence of effects associated with the nuclear environment modify the behavior of the partonic distributions. At RHIC energy [2,3,4], a suppression was observed for pion production in dAu collisions, and such a particular result is an important source to constrain the nuclear parton distribution function (nPDF). The cross sections for photon-target processes are a function of a single dimensionless scaling variable [16], instead of two independent variables, such as x and Q2 (photon virtuality). Such a property can be extended to single-particle production in hadron-hadron or p(d )A collisions. Direct photon production at large- and low-pT in a wide rapidity range is considered These results are an extension of the previous investigations presented in Ref.
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