Proton decay and cosmology strongly constrain the minimal SU(5) supergravity model
Abstract
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 (τp>1×1032 yr) and a small enough neutralino cosmological relic density (Ωχh20<=1). We find that the combined effect of these two constraints is quite severe, although still leaving a small region of parameter space with mg~,q~<1 TeV. The allowed values of the proton lifetime extend up to τp~=1×1033 yr and should be fully explored by the SuperKamiokande experiment. The proton lifetime cut also entails the following mass correlations and bounds: mh<~110 GeV, mχ~=1/2m0χ2~=0.15mg~, m0χ2~=m+χ1, and mχ<85 (115) GeV, m0χ2,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 m+χ1<~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 the CERN e+e- collider LEP II.
- Publication:
-
Physical Review D
- Pub Date:
- March 1993
- DOI:
- 10.1103/PhysRevD.47.2468
- arXiv:
- arXiv:hep-ph/9209220
- Bibcode:
- 1993PhRvD..47.2468L
- Keywords:
-
- 04.65.+e;
- 11.30.Pb;
- 12.10.Gq;
- 14.80.Ly;
- Supergravity;
- Supersymmetry;
- Supersymmetric partners of known particles;
- High Energy Physics - Phenomenology
- E-Print:
- 11 pages plus 5 figures (not included). CERN-TH.6628/92, CTP-TAMU-61/92. A condensed version of this paper will appear in the Proceedings of the XXVI International Conference on High Energy Physics, Dallas--Texas, August 5--12, 1992