Vector meson electroproduction at small Bjorken-x and generalized parton distributions - INSPIRE

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Vector meson electroproduction at small Bjorken-x and generalized parton distributions

S.V. Goloskokov
(
- Dubna, JINR
)
,
P. Kroll
(
- Wuppertal U.
)

Jan, 2005

38 pages

Published in:

Eur.Phys.J.C 42 (2005) 281-301

e-Print:

hep-ph/0501242 [hep-ph]

DOI:

10.1140/epjc/s2005-02298-5

Report number:

WU-B-05-01,
WU B 05-01

View in:

ADS Abstract Service

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Abstract:

We analyze electroproduction of light vector mesons at small Bjorken-x in an approach that includes the gluonic generalized parton distributions and a partonic subprocess, gamma g --> (q q-bar) g, q q-bar --> V. The subprocess is calculated to lowest order of perturbative QCD taking into account the transverse momenta of the quark and antiquark as well as Sudakov suppressions. Our approach allows to investigate the transition amplitudes for all kind of polarized virtual photons and polarized vector mesons. Modelling the generalized parton distributions through double distributions and using simple Gaussian wavefunctions for the vector mesons, we compute the longitudinal and transverse cross sections at large photon virtualities as well as the spin density matrix elements for the vector mesons. Our results are in fair agreement with the findings of recent experiments performed at HERA.

Note:

40 pages, 22 figures (using LATEX), v2: beginning of Sect. 3 is rewritten, a discussion on alternative choices of the slopes included and further small improvements in text

electron p: inelastic scattering
vector meson: electroproduction
small-x
photon p: inelastic scattering
photon: polarization
vector meson: polarization
polarized target
photon gluon: fusion
generalized parton distribution
quantum chromodynamics: perturbation theory

References(66)

Figures(21)

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