Collinear Singularities and Running Coupling Corrections to Gluon Production in CGC - High Energy Physics - PhenomenologyReportar como inadecuado




Collinear Singularities and Running Coupling Corrections to Gluon Production in CGC - High Energy Physics - Phenomenology - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We analyze the structure of running coupling corrections to the gluonproduction cross section in the projectile-nucleus collisions calculated in theColor Glass Condensate CGC framework. We argue that for the gluon productioncross section and for gluon transverse momentum spectra and multiplicity theinclusion of running coupling corrections brings in collinear singularities dueto final state splittings completely unaffected by CGC resummations. Hence,despite the saturation-CGC dynamics, the gluon production cross section is notinfrared-safe. As usual, regularizing the singularities requires an infraredcutoff Lambda coll that defines a resolution scale for gluons. We specificallyshow that the cutoff enters the gluon production cross section in the argumentof the strong coupling constant alpha sLambda coll^2. We argue that forhadron production calculations one should be able to absorb the collineardivergence into a fragmentation function. The singular collinear terms in thegluon production cross section are shown not to contribute to the energydensity of the produced matter, which is indeed an infrared-finite quantity.



Autor: Yuri V. Kovchegov, Heribert Weigert

Fuente: https://arxiv.org/







Documentos relacionados