par Adloff, Catherine;Marage, Pierre 
;Favart, Laurent ;Clerbaux, Barbara ; [et al.]
Référence Physics letters. Section B, 392, page (234-242)
Publication Publié, 1997
;Favart, Laurent ;Clerbaux, Barbara ; [et al.]Référence Physics letters. Section B, 392, page (234-242)
Publication Publié, 1997
Article révisé par les pairs
| Résumé : | The scale dependence of the evolution of photoproduction cross sections with the photon-proton centre of mass energy W is studied using low Q2 < 0.01 GeV2 e+p interactions collected by the H1 experiment at HERA. The value of the largest transverse momentum of a charged particle in the photon fragmentation region is used to define the hard scale. The slope of the W dependence of the cross section is observed to increase steeply with increasing transverse momentum. The result is compared to measurements of the Q2 evolution of the W dependence of the virtual photon-proton cross section. Interpretations in terms of QCD and in terms of Regge phenomenology are discussed. |
