Transverse Gluon Structure of the Proton and the Black-Disk Limit in High-Energy Scattering.

Frankfurt, L. ; Strikman, M. ; Weiss, C.

Technical Information Center Oak Ridge Tennessee

关键词: Gluons;    Protons;    Scattering;    Dipoles;    Color;   

RP-ID  :  DE2006862418

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The transverse spatial distribution of partons in the nucleon (generalized parton distributions) is a crucial ingredient in the description of high-energy ep and pp scattering with hard QCD processes. Experimental information about the transverse spatial distribution of gluons comes from measurements of the t-dependence of J/psi production at HERA and other processes. We discuss the physical mechanisms leading to a growth of the nucleon's transverse size at small x. Based on this information, we study the interaction of small-size color dipoles with the proton in the leading log Q(sup 2) approximation. We find that at small x and central impact parameters the dipole-nucleon interaction approaches the unitarity, or black-disk (BDL) limit. We argue that this new regime of strong interactions can be probed in central pp collisions at LHC.