$p\bar{p} \to Λ_c \barΛ_c$ within the generalized parton picture - first results

Goritschnig, A. T.; Kroll, P.; Schweiger, W.

$p\bar{p} \to Λ_c \barΛ_c$ within the generalized parton picture - first results

Authors

Goritschnig, A. T.

Kroll, P.

Schweiger, W.

Description

We study proton-antiproton annihilation into $Λ_c \barΛ_c$ pairs within the generalized parton picture. Our starting point is the double handbag diagram which is shown to factorize into soft generalized parton distributions for the $p \to Λ_c$ (and $\bar{p} \to \barΛ_c$) transition and a hard subprocess amplitude for $u \bar{u} \to c \bar{c}$. Thereby the mass of the charm quark is taken as the hard scale so that our results are not restricted to large scattering angles and/or incredibly large energies. Modelling the generalized parton distributions for the $p\to Λ_c$ transition by an overlap of simple quark-diquark light-cone wave functions we make first predictions for $p\to Λ_c$ transition form factors and unpolarized $p\bar{p} \to Λ_c \barΛ_c$ cross sections. Our findings may become interesting in view of forthcoming experiments at FAIR in Darmstadt.
Talk given at Light Cone 2008: Relativistic Nuclear and Particle Physics, Mulhouse, France, 07-1 July 2008