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Diffractive charm photoproduction at HERA ep-collider.pdf

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Diffractive charm photoproduction at HERA ep-collider

a r X i v : h e p - p h / 0 1 0 9 1 6 4 v 1 1 9 S e p 2 0 0 1 Diffractive charm photoproduction at HERA ep-collider A.V.Berezhnoy1, V.V.Kiselev2 I.A.Korzhavina1, A.K.Likhoded2 The cross section of the D?-meson diffractive photoproduction at the HERA collider has been calculated in the framework of perturbatively motivated model for the different kine- matic regions. The camparison between the different Pomeron models has been performed. 1 Skobeltsyn Institute for Nuclear Research Of Moscow State University, Moscow, Russia. 2Institute for High Energy Physics, Protvino, Russia. 1 From the experimental data, collected at HERA ep-collider [1], one can conclude that the charm production model proposed in article [3] (below denoted as BKL), allows to describe inclusive photopro- duction and deep inelastic production of D?±(2010)-mesons (below denoted as D?-mesons), as well as inclusive photoproduction Ds-mesons, with a good accuracy. Recently new data on D?-meson diffractive photoproduction have been presented by the ZEUS col- laboration [4]. In this connection we try to describe these new data in the framework of the BKL model. Let us remind the general features of this model. In the BKL approach one needs to produce pertur- batively c- and d?-quarks which softly form D?-meson. These perturbatively produced c- and d?-quark are valence ones for the meson. The soft hadronization process of the cd?-pair color singlet state is described by the average value of the operator: 〈O(1)〉 = 1 12MD? ( ?gμν + pμD?p ν D? M2D? ) 〈D?(pD?)|(c?γμd)(d?γνc)|D ?(pD?)〉, (1) where pD? is D ?-meson momentum, and MD? is the meson mass. In the framework of the nonrelativistic potential model the average value of the operator correspond with the squared wave function in the origin: 〈O(1)〉|NR = |Ψ(0)| 2. The hadronization of the color octet state is described by the average value of the analogous operator: 〈O(8)〉 = 1 8MD? ( ?gμν + pμD?p ν D? M2D? ) 〈D?(pD?)|(c?γμλ ad)(d?γνλ bc)|D?(pD?)〉 δab 8 .