Saturation effects in exclusive rhoT, rhoL meson electroproduction

Abstract

We use recent results for the gamma*L -> rhoL and gamma*T -> rhoT impact factors, computed in the impact parameter representation within the collinear factorization scheme, to get predictions for the polarized cross-sections sigmaT and sigmaL of the diffractive leptoproduction of the rho meson at high energy. In this approach the helicity amplitude is a convolution of the scattering amplitude of a color dipole with a target, together with the virtual gamma wave function and with the first moments of the rho meson wave function (in the transverse momentum space), given by the distribution amplitudes up to twist 3 for the gamma*T -> rhoT impact factor and up to twist 2 for the gamma*L -> rhoL impact factor. Combining these results with recent dipole models fitted to DIS data, which include saturation effects, we show that the predictions are in good agreement with HERA data for photon virtuality (Q**2) larger than typically 5 GeV**2, without free parameters and with a weak dependence on the choice of the factorization scale, i.e. the shape of the DAs, for both longitudinally and transversely polarized rho meson. For lower values of Q**2, the inclusion of saturation effects is not enough to provide a good description of HERA data. We believe that it is a signal of a need for higher twist contributions in the rho meson DAs. We also analyze the radial distributions of dipoles between the initial gamma* and the final rho meson states.

49 pages, 20 figures

References in corpus (19)

• A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector
• Quark contribution to the small-$x$ evolution of color dipole
• Analysis of combined HERA data in the Impact-Parameter dependent Saturation model
• Non-linear QCD meets data: A global analysis of lepton-proton scattering with running coupling BK evolution
• Solving The High Energy Evolution Equation Including Running Coupling Corrections
• ILC Reference Design Report Volume 1 - Executive Summary
• Twist-4 Distribution Amplitudes of the K${}^{\ast }$ and $\varphi$ Mesons in QCD
• Particle multiplicities in Lead-Lead collisions at the LHC from non-linear evolution with running coupling
• Confronting Mueller-Navelet jets in NLL BFKL with LHC experiments at 7 TeV
• Saturation physics at HERA and RHIC: An unified description
• Electroproduction of two light vector mesons in next-to-leading BFKL: study of systematic effects
• Extracting the rho meson wavefunction from HERA data
• Collinear improvement of the BFKL kernel in the electroproduction of two light vector mesons
• Exclusive vector meson production and small-x evolution
• Diffractive production of two rho^0_L mesons in e^+e^- collisions
• Ratios of Helicity Amplitudes for Exclusive rho-0 Electroproduction
• Mueller-Navelet jets at LHC: the first complete NLL BFKL study
• DVCS and the skewness effect at small x
• A test of the BFKL resummation at ILC

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