Hadron production in diffractive deep inelastic scattering

Characteristics of hadron production in diffractive deep-inelastic positron-proton scattering are studied using data collected in 1994 by the H1 experiment at HERA. The following distributions are measured in the centre-of-mass frame of the photon dissociation system: the hadronic energy flow, the Feynman-x (x_F) variable for charged particles, the squared transverse momentum of charged particles (p_T^{*2}), and the mean p_T^{*2} as a function of x_F. These distributions are compared with results in the gamma^* p centre-of-mass frame from inclusive deep-inelastic scattering in the fixed-target experiment EMC, and also with the predictions of several Monte Carlo calculations. The data are consistent with a picture in which the partonic structure of the diffractive exchange is dominated at low Q^2 by hard gluons.

Note:

16 pages, 6 figures, submitted to Phys. Lett. B Report-no: DESY 98-029

positron p: colliding beams
positron p: deep inelastic scattering
diffraction
photon: dissociation
energy flow: hadronic
charged particle: transverse momentum
spectrum: x-dependence
flux: pomeron
structure function: pomeron
gluon

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