Note on the pseudo-Nambu-Goldstone Boson of Meta-stable SUSY Violation

Details Note on the pseudo-Nambu-Goldstone Boson of Meta-stable SUSY Violation Note on the pseudo-Nambu-Goldstone Boson of Meta-stable SUSY Violation

2009-08-14

arxiv.org/abs/0908.2004v3

JHEP 0911:097,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 3 figures. Version 2: minor typographical errors fixed. Version 3: a more reliable estimate for the decay rate of K-

Scientific paper

10.1088/1126-6708/2009/11/097

Many models of meta-stable supersymmetry (SUSY) breaking lead to a very light scalar pseudo-Nambu Goldstone boson (PNGB), P, associated with spontaneous breakdown of a baryon number like symmetry in the hidden sector. Current particle physics data provide no useful constraints on the existence of P. For example, the predicted decay rates for both K --> pi + P, b--> s + P and Upsilon --> photon + P are many orders of magnitude below the present experimental bounds. We also consider astrophysical implications of the PNGB and find a significant constraint from its effect on the evolution of red giants. This constraint either rules out models with a hidden sector gauge group larger than SU(4), or requires a new intermediate scale, of order at most 10^{10} GeV, at which the hidden sector baryon number is explicitly broken.

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