Study of Multiple Interactions In photoproduction at HERA

Reference Preliminary ICHEP08, July 2008
Document Conference paper or talk
Figures  (1)  (2)  (2a)  (2b)  (3)  (3-1)  (3-2)  (3-3)  (3-4)  (4)  (4-1)  (4-2)  (4-3)  (4-4)  (5)  (5-1)  (5-2)  (5-3)  (5-4)  (6)  (6-1)  (6-2)  (6-3)  (6-4)  (7)  (8)  (9)  (10)
Contact Lluis Marti, Hannes Jung Analysis webpage
Abstract Photoproduction data of HERA-I are analyzed by requiring dijets with transverse momenta of at least 5 GeV. The two jets define in azimuth a towards region (leading jet) and an away region (2nd jet) and transverse regions between them. The charged particle multiplicity is measured in these regions as a function of the variables x_gamma, P_t(leading jet) and W_gammap. Models which include contributions of multiparton interactions are able to describe the measurement, whereas predictions without them lie below the measurements, especially at low x_gamma, the region of enhanced contributions from the resolved photon.
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