Proton decay and cosmology strongly constrain the minimal SU(5) supergravity model

Details Proton decay and cosmology strongly constrain the minimal SU(5) supergravity model Proton decay and cosmology strongly constrain the minimal SU(5) supergravity model

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..272.1395l&link_type=abstract

Proceedings of the XXVI International Conference on High Energy Physics. Vol. II. AIP Conference Proceedings, Volume 272, pp. 1

Physics

High Energy Physics

Decays Of Baryons

Scientific paper

We present the results of an extensive exploration of the five-dimensional parameter space of the minimal SU(5) supergravity model, including the constraints of a long enough proton lifetime and a small enough neutralino cosmological relic density. We find that the combined effect of these two constraints is never quite severe, although still leaving a small region of parameter space with mg~,g~<1 TeV. The allowed values of the proton lifetime should be fully explored by the SuperKamiokande experiment. The proton lifetime cut also entails the following mass correlations and bounds: mh<~100 GeV, mx~=1/2 mx02~=0.15mg, mχ02~= mχ+1 , and mχ<85(115) GeV, mχ02,χ+1<165(225) GeV for α3=0.113(0.120). Finally, the combined proton decay and cosmology constraints predict that if mh>~75(80) GeV then mχ+1<~90(110) GeV for α3=0.113(0.120). Thus, if this model is correct, at least one of these particles will likely be observed at LEPII.

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