DOI 10.1007/s100529900203
Exclusive photoproduction of 
on proton in the
quark-diquark model
C. Carimalo1 - N. Arteaga-Romero2 - S. Ong3
1 LPNHE, IN2P3-CNRS, Universités Paris VI et VII, 4 Place
Jussieu, 75252 Paris Cedex 05, France
2 Université Paris VI, 4 Place
Jussieu, 75252 Paris Cedex 05, France
3 Institut de Physique Nucléaire, IN2P3-CNRS, Université
Paris-Sud, 91406 Orsay Cedex, France
Received: 5 November 1998 / Revised version: 13 July 1999 / Published online: 3 November 1999
Abstract
We present predictions for exclusive photoproduction of
a
meson on proton at large transfer, where we use a quark-diquark
structure model for the proton. Extrapolation from our results to lower
transfers is comparable in magnitude with available data in that range.
This may support the diquark model in its ability to provide, for that
process, an appropriate link between diffractive physics at low transfer
and the standard semiperturbative approach of hard exclusive processes at
very large transfer, in which the proton recovers its three-quark
structure.
Copyright Springer-Verlag
