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High Energy Physics - Phenomenology

arXiv:hep-ph/0507310 (hep-ph)
[Submitted on 27 Jul 2005 (v1), last revised 21 Dec 2006 (this version, v2)]

Title:Leading twist nuclear shadowing and suppression of hard coherent diffraction in proton-nucleus scattering

Authors:V.Guzey (Ruhr U., Bochum), M.Strikman (Penn State U.)
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Abstract: We use the Glauber-Gribov multiple scattering formalism and the theory of leading twist nuclear shadowing to develop a method for the calculation of leading twist hard coherent diffraction in hadron-nucleus processes. We demonstrate that soft multiple rescatterings lead to the factorization breaking of hard diffraction in proton-nucleus scattering, which is larger than in hadron-nucleon scattering. At the LHC and RHIC kinematics, we compare the hard diffractive to e.m.~mechanisms of hard coherent production of two jets in proton-nucleus scattering. We study the x_{\Pomeron}, \beta and A-dependence of the ratio of the dijet production cross sections due to the two effects, R. We demonstrate that in proton-heavy nucleus hard coherent diffraction at the LHC, R is small, which offers a clean method to study hard photon-proton scattering at the energies exceeding the HERA energies by the factor of ten. On the other hand, the use of lighter nuclei, such as Ca-40, will allow to study the screened nuclear diffractive parton distribution. Moreover, a comparison of the dijet diffractive production to the heavy-quark-jet diffractive production will estimate the screened nuclear diffractive gluon PDF, which will be measured in nucleus-nucleus ultraperipheral collisions at the LHC.
Comments: 25 pages, 11 figures, LaTeX. It is a significantly revised and extended version of our original preprint. The calculation of leading twist nuclear shadowing is based on the most recent H1 diffractive fits
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: RUB-TPII-7/2005
Cite as: arXiv:hep-ph/0507310
  (or arXiv:hep-ph/0507310v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0507310
Journal reference: Phys.Rev.C75:045208,2007
Related DOI: https://doi.org/10.1103/PhysRevC.75.045208

Submission history

From: Vadim Guzey [view email]
[v1] Wed, 27 Jul 2005 09:44:08 UTC (35 KB)
[v2] Thu, 21 Dec 2006 20:55:05 UTC (54 KB)
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