Speaker
Michal Krelina
(Czech Technical University in Prague)
Description
The Low theorem, proven only for diffractive photon radiation, cannot be extended to inelastic hadronic collisions with multi-particle production. Comparison with incorrect calculations led to the so-called soft-photon puzzle. We describe soft photon production within the color-dipole approach. The required quark distribution in the colliding hadrons at a soft scale is calculated employing the popular quark-gluon string model (QGSM). The dipole cross section is parametrized and fitted to HERA DIS data at low $Q^2$. Our results are in good accord with data on low-$k_T$ photon yield in pp inelastic collisions.
Author
Michal Krelina
(Czech Technical University in Prague)
Co-authors
Boris Kopeliovich
(UTFSM)
Klaus Reygers
(Ruprecht Karls Universitaet Heidelberg (DE))
