DOI 10.1007/s100529901051
Exclusive electroproduction of
and
mesons at HERA
ZEUS Collaboration
J. Breitweg - et al.
Argonne National Laboratory, Argonne, IL, USA
Received: 20 August 1998 / Published online: 14 January 1999
Abstract
Exclusive production of and
mesons
in e+p collisions has been studied with the ZEUS detector
in the kinematic range
0.25 < Q2 < 50
, 20 < W < 167 GeV for the
data
and 2 < Q2 < 40
, 50 < W < 150 GeV for the
data.
Cross sections for exclusive
and
production have been measured as a function of
Q2, W and t. The spin-density matrix elements
r0400, r11-1 and Re
have been determined for exclusive
production
as well as r0400 and r041-1
for exclusive
production.
The results are discussed in the context of theoretical
models invoking soft and hard phenomena.
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