High Energy Rho Meson Leptoproduction §

Adrien Besse*, 1, Lech Szymanowski2, Samuel Wallon3, 4
1 Irfu-SPhN, CEA, Saclay, France
2 National Centre for Nuclear Research (NCBJ), Warsaw, Poland
3 LPT, Université Paris-Sud, CNRS, 91405, Orsay, France
4 UPMC Univ. Paris 06, Faculté de physique, 4 place Jussieu, 75252 Paris Cedex 05, France

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© Besse et al; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Irfu-SPhN, CEA, Saclay, France; Tel: +33 1 69 08 74 29; Fax: +33 1 69 08 75 84; E-mail:
§ Presented at the Low x workshop, May 30 - June 4 2013, Rehovot and Eilat, Israel.


We investigate the longitudinal and transverse polarized cross-sections of the leptoproduction of the ρ meson in the high energy limit. Our model is based on the computation of the impact factor γ*(λγ)→ ρ (λρ) using the twist expansion in the forward limit which is expressed in the impact parameter space. This treatment involves in the final stage the twist 2 and twist 3 distribution amplitudes (DAs) of the ρ meson and the dipole scattering amplitude. Taking models that exist for the DAs and for the dipole cross-section. We get a phenomenological model for the helicity amplitudes. We compare our predictions with HERA data and get a fairly good description for large enough virtualities of the photon.

PACS number(s): 13.60.Le, 12.39.St, 12.38.Bx.

Keywords: Collinear factorization, leptoproduction of vecteur meson, low x, helicity amplitudes, kT-factorization, polarized cross-sections.