A new gamma*-p / pbar-p factorization test in diffraction, valid below Q^2 about 6 GeV^2

Details A new gamma*-p / pbar-p factorization test in diffraction, valid below Q^2 about 6 GeV^2 A new gamma*-p / pbar-p factorization test in diffraction, valid below Q^2 about 6 GeV^2

2003-01-31

arxiv.org/abs/hep-ph/0301277v2

Eur.Phys.J. C33 (2004) 325-332

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 7 Encapsulated Postscript figures, LaTex, submitted to European Phisical Journal C

Scientific paper

10.1140/epjc/s2004-01609-8

One of the key experimental issues in high energy hadron physics is the extent to which data from the diffractive interaction mechanism may be described by a factorized formula which is the product of a universal term describing the probability of finding a Pomeron in a proton (loosely referred to as the "Pomeron flux-factor") and a term decribing the Pomeron's interaction with the other incident proton. In the present paper, after demonstrating that existing data on diffractive gamma*-p and pbar-p interactions show that the Pomeron flux-factor is not universal, we present the results of a new test of factorization in these interactions which does not rely on universality of the flux-factor. The test is satisfied to within ~20% for 1 < Q^2 ~ 6 GeV^2 and beta < 0.2 in the gamma*-p interactions, suggesting that the resons for non-universality of the flux-factor have a limited effect on the factorization itself. However, a clear breakdown of this test is observed at larger Q^2. Kharzeev and Levin suggest that this can be attributed to the onset of QCD evolution effects in the Pomeron's structure. The breakdown occurs in a Q^2 region which agrees with their estimates of a small Pomeron size.

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