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Article
Report number	hep-ph/9711516 ; CERN-TH-97-339 ; DFPD-97-TH-52 ; CERN-TH-97-339 ; DFPD-97-TH-52
Title	Signals of a superlight gravitino at $e^+ e^-$ colliders when the other superparticles are heavy
Author(s)	Brignole, Andrea (CERN) ; Feruglio, Ferruccio (CERN) ; Zwirner, Fabio (INFN, Padua)
Affiliation	(CERN) ; (INFN Padua)
Publication	1998
Imprint	1 Dec 1997
Number of pages	17
Note	17 pages, 5 figures, plain Latex. Sign of an interference term corrected, physics unchanged Report-no: CERN-TH/97-339, DFPD-97/TH/52 Journal-ref: Nucl.Phys. B516 (1998) 13
In:	Nucl. Phys. B 516 (1998) pp.13
DOI	10.1016/S0550-3213(97)00825-0 10.1016/S0550-3213(99)00389-2 (Erratum)
Subject category	Particle Physics - Phenomenology
Free keywords	e+ e-
Abstract	If the gravitino G is very light and all the other supersymmetric particles are above threshold, supersymmetry may still be found at colliders, by looking at processes with only gravitinos and ordinary particles in the final state. We compute here the cross-section for the process e^+ e^- ==> G G gamma, whose final state can give rise to a distinctive photon plus missing energy signal at present and future e^+ e^- colliders. We describe how the present LEP data can be used to establish a lower bound on the gravitino mass of order 10^{-5} eV. We conclude with a critical discussion of our results, comparing them with related ones and outlining possible generalizations.
Copyright/License	Copyright @ unknown. Published by Elsevier B.V.

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