Measurement of the diffractive cross-section in deep inelastic scattering using ZEUS 1994 data

Breitweg, J.; Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Repond, J.; Stanek, R.; Talaga, R.L.; Yoshida, R.

doi:10.1007/PL00021606

Measurement of the diffractive cross-section in deep inelastic scattering using ZEUS 1994 data

ZEUS

Collaboration

Jul, 1998

46 pages

Published in:

Eur.Phys.J.C 6 (1999) 43-66

e-Print:

hep-ex/9807010 [hep-ex]

DOI:

10.1007/PL00021606

Report number:

DESY-98-084,
ANL-HEP-PR-98-98

Experiments:

DESY-HERA-ZEUS

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Abstract:

The DIS diffractive cross section,

d\sigma^{diff}_{\gamma^* p \to XN}/dM_X

, has been measured in the mass range

M_X < 15

GeV for

\gamma^*p

c.m. energies

60 < W < 200

GeV and photon virtualities

Q^2 = 7

to 140 GeV

^2

. For fixed

Q^2

and

M_X

, the diffractive cross section rises rapidly with

W

,

d\sigma^{diff}_{\gamma^*p \to XN}(M_X,W,Q^2)/dM_X \propto W^{a^{diff}}

with

a^{diff} = 0.507 \pm 0.034 (stat)^{+0.155}_{-0.046}(syst)

corresponding to a

t

-averaged pomeron trajectory of \bar{\alphapom} = 1.127 \pm 0.009 (stat)^{+0.039}_{-0.012} (syst) which is larger than \bar{\alphapom} observed in hadron-hadron scattering. The

W

dependence of the diffractive cross section is found to be the same as that of the total cross section for scattering of virtual photons on protons. The data are consistent with the assumption that the diffractive structure function

F^{D(3)}_2

factorizes according to \xpom F^{D(3)}_2 (\xpom,\beta,Q^2) = (x_0/ \xpom)^n F^{D(2)}_2(\beta,Q^2). They are also consistent with QCD based models which incorporate factorization breaking. The rise of \xpom F^{D(3)}_2 with decreasing \xpom and the weak dependence of

F^{D(2)}_2

on

Q^2

suggest a substantial contribution from partonic interactions.

Note:

46 pages including 14 figures Report-no: DESY 98-084

positron p: colliding beams
positron p: deep inelastic scattering
photon: diffraction
exchange: pomeron
p: diffraction
diffraction: structure function
cross section: energy dependence
cross section: mass
momentum transfer dependence
ZEUS

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