Breakdown of kT-factorization and J/Psi production in dA collisions

Thumbnail Image
Date
2011-01-01
Authors
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Person
Tuchin, Kirill
Professor
Research Projects
Organizational Units
Organizational Unit
Physics and Astronomy
Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
Journal Issue
Is Version Of
Versions
Series
Abstract

In spite of the sweeping coherence effects in high energy hadron and nuclei collisions, kT-factorization can be recovered for the inclusive gluon production in pA collisions at the leading logarithmic order. In open charm production at RHIC kT-factorization holds numerically with about 10-20% accuracy. This allows to extrapolate the cold nuclear matter effect observed in light and charm meson production in dA collisions to that in AA ones. Unlike the open charm, the breakdown of factorization in J/Psi production is severe. Indeed, already at the lowest order in gluon density the main contribution to the inclusive cross section is proportional to the square of gluon density in the nucleus. As a consequence, one cannot infer the cold nuclear matter effect on J/Psi production in AA collisions from that in dA. We present the calculation of J/Ψ multiplicity in the framework of the CGC (color glass condensate)/saturation and show that it agrees with the experimental data.

Comments

NOTICE: This is the author's version of a work that was accepted for publication in Nuclear Physics A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nuclear Physics A, v.854 (2011): doi: 10.1016/j.nuclphysa.2010.08.005.

Description
Keywords
Citation
DOI
Copyright
Fri Jan 01 00:00:00 UTC 2010
Collections