Polarisation observables in lepton-antilepton-to-proton-antiproton reactions including lepton mass |
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Authors: | N H Buttimore E Jennings |
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Institution: | (1) Trinity College, School of Mathematics, Dublin, Ireland |
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Abstract: | General expressions, including the lepton mass, for the spin-averaged differential cross-section for the annihilation reaction
lepton-antilepton to proton-antiproton are given, as well as general formulae for the single- and double-spin asymmetries
in the centre-of-mass frame. In particular, we discuss the single-spin asymmetry, normal to the scattering plane, which measures
the relative phase difference between nucleon electromagnetic form factors GE and GM. Recent experimental investigations of these form factors in the space- and time-like region are reviewed. It is thought
that measurements of the phase of these form factors will provide fundamental information on the internal nucleon structure.
The phases between GE and GM are accessible through polarisation observables measured in the antiproton-proton-to-lepton-antilepton reaction, or in its
time-reversed process. |
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Keywords: | 13 40 Gp Electromagnetic form factors 13 75 Cs Nucleon-nucleon interactions (including antinucleons deuterons etc ) 13 66 Bc Hadron production in e - e + interactions 14 20 Dh Protons and neutrons |
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