Role of chiral scalar and pseudoscalar in two-photon production of a superlight gravitino

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Abstract
The interesting possibility of observing a superlight gravitino in photon-photon collisions has been pointed out recently. A complete analysis is done of that problem taking into full account the contributions from superlight chiral scalar and pseudoscalar hidden-sector particles which couple gravitationally. The order of magnitude of the cross section is the same as that in the earlier work.