FINAL STATE INTERACTION AND ANISOTROPY OF PAIR PRODUCTION CLOSE TO THRESHOLD IN e+e- ANNIHILATION
2014 ◽
Vol 35
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pp. 1460403
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The final state interaction in the processes [Formula: see text] and [Formula: see text] close to the threshold is discussed. It is shown that, due to the Coulomb interaction, the contribution of the d wave to the cross section does not vanish even at zero relative velocity of produced particles. This results in the nonzero anisotropy in angular distribution at the threshold. We use the Paris nucleon-antinucleon optical potential for explanation of experimental data in the process [Formula: see text] near threshold. It follows from our consideration that the isoscalar form factor is much larger than the isovector one.
2014 ◽
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1976 ◽
Vol 37
(16)
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pp. 1049-1052
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