Production of a pion in association with a high-Q2 dilepton pair in antiproton-proton annihilation at GSI-FAIR - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review D Année : 2007

Production of a pion in association with a high-Q2 dilepton pair in antiproton-proton annihilation at GSI-FAIR

Résumé

We evaluate the cross section for anti-p p -> l+ l- pi0 in the forward direction and for large lepton pair invariant mass. In this kinematical region, the leading-twist amplitude factorises into a short-distance matrix element, long-distance dominated antiproton Distribution Amplitudes and proton to pion Transition Distribution Amplitudes (TDA). Using a modelling inspired from the chiral limit for these TDAs, we obtain a first estimate of this cross section, thus demonstrating that this process can be measured at GSI-FAIR.

Dates et versions

hal-00177662 , version 1 (08-10-2007)

Identifiants

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J. P. Lansberg, B. Pire, L. Szymanowski. Production of a pion in association with a high-Q2 dilepton pair in antiproton-proton annihilation at GSI-FAIR. Physical Review D, 2007, D76, pp.111502. ⟨hal-00177662⟩
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