Production of a pion in association with a high-Q2dilepton pair in antiproton-proton annihilation at GSI-FAIR

2007/10/05 by Jean-Philippe Lansberg, J. P. Lansberg, B. Pire +1
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevd.76.111502

published as Phys.Rev.D76:111502,2007 · Latex, 5 pages, 3 figures

arxiv created 2007/10/05 · openalex publication_date 2007/12/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We evaluate the cross section for pp\ensuremath→\ensuremathℓ⁺\ensuremathℓ^\ensuremath-\ensuremathπ⁰ in the forward direction and for a large lepton pair invariant mass. In this kinematical region, the leading-twist amplitude factorizes into a short-distance matrix element, long-distance antiproton-distribution amplitudes, and proton to pion transition distribution amplitudes (TDAs). Using a modeling inspired from the chiral limit for these TDAs, we obtain a first estimate of this cross section, which demonstrates that this process can be measured at GSI-FAIR.

Citations

• Testing axial and electromagnetic nucleon form factors in time-like regions in the processesp¯+n→π−+ℓ−+ℓ+andp¯+p→π0+ℓ−+ℓ+,ℓ=e,μ
• Hard exclusive pseudoscalar meson electroproduction and spin structure of the nucleon
• A model for the pion structure function