Inclusive transverse momentum distributions of charged particles in diffractive and non--diffractive photoproduction at HERA

Abstract

Inclusive transverse momentum spectra of charged particles in photoproduction events in the laboratory pseudorapidity range $-1.2<\eta <1.4$ have been measured up to $p_{T}=8\GeV $ using the ZEUS detector. Diffractive and non--diffractive reactions have been selected with an average $\gamma p$ centre of mass (c.m.) energy of $\langle W \rangle = 180\GeV$. For diffractive reactions, the $p_T$ spectra of the photon dissociation events have been measured in two intervals of the dissociated photon mass with mean values $⟨M_X⟩=5$ GeV and $10$ GeV. The inclusive transverse momentum spectra fall exponentially in the low $p_T$ region. The non--diffractive data show a pronounced high $p_T$ tail departing from the exponential shape. The $p_T$ distributions are compared to lower energy photoproduction data and to hadron--hadron collisions at a similar c.m. energy. The data are also compared to the results of a next--to--leading order QCD calculation.

23 pages, latex, 4 figures appended as uuencoded file

References in corpus (1)

• Inclusive particle production at HERA: Higher-order QCD corrections to the resolved quasi-real photon contribution

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