Helicity amplitudes and crossing relations for antiproton proton reactions

Details Helicity amplitudes and crossing relations for antiproton proton reactions Helicity amplitudes and crossing relations for antiproton proton reactions

2007-02-24

arxiv.org/abs/hep-ph/0702248v4

Eur.Phys.J.A33:21-27,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 5 figures, submitted to EPJA

Scientific paper

10.1140/epja/i2007-10393-6

Antiproton proton annihilation reactions allow unique access to the moduli and phases of nucleon electromagnetic form factors in the time like region. We present the helicity amplitudes for the unequal mass single photon reaction $p \bar{p}\to l^+ l^-$ in the s channel including the lepton mass. The relative signs of these amplitudes are determined using simple invariance properties. Helicity amplitudes for the annihilation reaction $p \bar{p} \to N \bar{N}$ are also given, where $N$ is any spinor particle with structure. Crossing relations between the $e p \to e p$ scattering and the $p \bar{p}\to l^+ l^-$ annihilation channels are discussed and the crossing matrix for the helicity amplitudes is given. This matrix may be used to verify known expressions for the space like helicity amplitudes due to one photon exchange.

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