https://doi.org/10.1140/epjc/s2006-02545-3
Theoretical Physics
Transversity GPD in photoproduction and electroproduction of two vector mesons
1
CPhT, École Polytechnique, 91128, Palaiseau, France
2
Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
3
Sołtan Institute for Nuclear Studies, Hoża 69, 00-681, Warsaw, Poland
4
Université de Liège, 4000, Liège, Belgium
5
LPT, Université Paris-Sud, 91405, Orsay, France
* e-mail: REnberg@lbl.gov
Received:
18
January
2006
Revised:
11
March
2006
Published online:
20
April
2006
The chiral-odd generalized parton distribution (GPD), or transversity GPD, of the nucleon can be accessed experimentally through the photoproduction or electroproduction of two vector mesons on a polarized nucleon target, γ(*)N→ρ1ρ2N’, where ρ1 is produced at large transverse momentum, ρ2 is transversely polarized, and the mesons are separated by a large rapidity gap. We predict the cross section for this process for both transverse and longitudinal ρ2 production. To this end, we propose a model for the transversity GPD HT(x,ξ,t) and give an estimate of the relative sizes of the transverse and longitudinal ρ2 cross sections. We show that a dedicated experiment at high energy should be able to measure the transversity content of the proton.
© Springer-Verlag, 2006