QCD analysis of the diffractive structure function F-2(D)(3) - art. no. 074004

Citation
C. Royon et al., QCD analysis of the diffractive structure function F-2(D)(3) - art. no. 074004, PHYS REV D, 6307(7), 2001, pp. 4004
Citations number
44
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6307
Issue
7
Year of publication
2001
Database
ISI
SICI code
0556-2821(20010401)6307:7<4004:QAOTDS>2.0.ZU;2-R
Abstract
The proton diffractive structure function F-2(D(3)) measured in the H1 and ZEUS experiments at DESY HERA is analyzed in terms of both Regge phenomenol ogy and perturbative QCD evolution. A new method determines the values of t he Regge intercepts in "hard" diffraction, confirming a higher value of the Pomeron intercept than for soft physics. The data are well described by a QCD analysis in which pointlike parton distributions, evolving according to the DGLAP equations, are assigned to the leading and subleading Regge exch anges. The gluon distributions are found to be quite different for H1 and Z EUS. A global fit analysis, where a higher twist component is taken from mo dels, allows us to use data in the whole available range in diffractive mas s and gives a stable answer for the leading twist contribution. We give set s of quark and gluon parton distributions for the Pomeron, and predictions for the charm and the longitudinal proton diffractive structure function fr om the QCD fit. An extrapolation to the Fermilab Tevatron range is compared with CDF data on single diffraction. Conclusions on factorization breaking depend critically on whether H1 (strong violation) or ZEUS (compatibility at low beta) fits are taken into account.