Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-08-13
Phys.Rev.D78:075032,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 9 figures and 1 table, typos corrected
Scientific paper
10.1103/PhysRevD.78.075032
An unstable gravitino with lifetime longer than $10^{26}$ sec or so has been proposed as a possible dark matter candidate in supergravity models with R-parity breaking. We find a natural realization of this idea in the minimal supersymmetric left-right models where left-right symmetry breaking scale in the few TeV range. It is known that in these models, R-parity must break in order to have parity breaking as required by low energy weak interactions. The sub-eV neutrino masses imply that R-parity breaking effects in this model must be highly suppressed. This in turn makes the gravitino LSP long lived enough, so that it becomes the dark matter of the Universe. It also allows detectable displaced vertices at the LHC from NLSP decays. We present a detailed analysis of the model and some aspects of its rich phenomenology.
Ji Xiangdong
Mohapatra Rabindra N.
Nussinov Shmuel
Zhang Yue
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