Off-shell generalized parton distributions and form factors of the pion

Abstract

Off-shell effects in generalized parton distributions (GPDs) of the pion, appearing, e.g., in the Sullivan process, are considered. Due to the lack of crossing symmetry, the moments of GPDs involve also odd powers of the skewness (longitudinal momentum transfer) parameter, which results in emergence of new off-shell form factors. With current-algebra techniques, we derive exact relations between the four off-shell gravitational form factors of the pion, in analogy to the electromagnetic case. Our results place stringent constraints on the off-shell GPDs of the pion. We provide an explicit realization in terms of a chiral quark model, where we show that the off-shell effects in GPDs are potentially significant in modeling physical processes and should not be neglected.

arXiv commentdiscussion and references added, 5 pages, 2 figures

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• Effect of nuclear medium on the spatial distribution of pions
• Valence quark distribution of light $\rho$ and heavy $J/\psi$ vector mesons in light-cone quark model
• The kaon off-shell generalized parton distributions and transverse momentum dependent parton distributions
• Determination of the pion generalized parton distributions at zero skewness