Abstract
Achieving a precise description of the internal structure of hadrons is crucial for deciphering the hidden properties and symmetries of fundamental particles. It is a hard task since there are several bottlenecks in obtaining theoretical predictions starting from first principles. In order to complement highly accurate experiments, it is necessary to use ingenious strategies to impose constraints from the theory side. In this article, we describe how photons can be used to unveil the internal structure of hadrons. We explore how to describe NLO QCD plus LO QED corrections to hadron plus photon production at colliders and discuss the impact of these effects on the experimental measurements.
Highlights
Introduction and MotivationUnderstanding the internal structure of non-fundamental particles implies dealing with complex models, for which the solutions cannot be obtained, even if they take advantage of the fascinating simplifications introduced by gauge symmetries
We always used the corresponding sets with next-to-leading order (NLO) QCD corrections
When we switch to MSTW2008 parton distribution functions (PDF), we find that the cross γ section is higher than for the default configuration and that the trend increases with p T : the relative difference is O(7%)
Summary
Understanding the internal structure of non-fundamental particles implies dealing with complex models, for which the solutions cannot be obtained, even if they take advantage of the fascinating simplifications introduced by gauge symmetries. A widely applied strategy to describe the internal structure of hadrons relies on the parton model, which is based on the study of the distribution of partons (i.e., fundamental particles such as quarks and gluon) inside the hadrons These distributions are extracted from the experiments, by using advanced fitting and modelling methods [1] and by including spin information within the polarized parton distribution functions (PDF). In order to shed light onto possible solutions to the spin crisis and to obtain more information about the internal dynamics of hadrons, we need to access parton level kinematics in the most clean and unperturbed manner It is a well-known fact that high-energy collisions of hadrons produce a hot and dense medium mainly composed of strongly interacting particles.
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