Inclusive charged particle distributions in deep inelastic scattering events at HERA - INSPIRE

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Inclusive charged particle distributions in deep inelastic scattering events at HERA

ZEUS

Collaboration

Nov, 1995

34 pages

Published in:

Z.Phys.C 70 (1996) 1-16

e-Print:

hep-ex/9511010 [hep-ex]

DOI:

10.1007/s002880050075

Report number:

DESY-95-221

Experiments:

DESY-HERA-ZEUS

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Abstract:

A measurement of inclusive charged particle distributions in deep inelastic

ep

scattering for

\gamma~* p

centre-of-mass energies

75< W < 175

GeV and momentum transfer squared

10< Q~2 < 160

GeV

~2

from the ZEUS detector at HERA is presented. The differential charged particle rates in the

\gamma~* p

centre-of-mass system as a function of the scaled longitudinal momentum,

x_F

, and of the transverse momentum,

p_t~*

and

<\!\!p_t~{*\,2}\!\!>\,\,

, as a function of

x_F

,

W

and

Q~2

are given. Separate distributions are shown for events with (LRG) and without (NRG) a rapidity gap with respect to the proton direction. The data are compared with results from experiments at lower beam energies, with the naive quark parton model and with parton models including perturbative QCD corrections. The comparison shows the importance of the higher order QCD processes. Significant differences of the inclusive charged particle rates between NRG and LRG events at the same

W

are observed. The value of

<\!\!p_t~{*\,2}\!\!>\,\,

for LRG events with a hadronic mass

M_X

, which excludes the forward produced baryonic system, is similar to the

<\!\!p_t~{*\,2}\!\!>\,\,

value observed in fixed target experiments at

W \approx M_X

.

Note:

34 pages, latex, 9 figures appended as uuencoded file Report-no: DESY 95-221

electron p: colliding beams
colliding beams: electron p
electron p: deep inelastic scattering
deep inelastic scattering: electron p
electron p: inclusive reaction
charged particle: electroproduction
electroproduction: charged particle
hadron: electroproduction
electroproduction: hadron
rapidity: gap

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