Tao Liu, Lin Wang, Jin Min Yang
If supersymmetry is broken independently in multiple sectors with different scales, a number of goldstinos will be generated. One linear combination of these goldstinos is massless and eaten by the gravitino, while the orthogonal combinations acquire a tree level mass and become the physical states named goldstini (G'). Compared to the gravitino, such goldstini could couple more strongly to the visible fields and lead to some exotic phenomenology. In this note we first check the goldstini couplings in some GMSB models and find that the goldstini-photon-neutralino interaction may be very small while the goldstini-Z-neutralino and goldstini-Higgs-neutralino interactions may be sizable. This can induce a new decay mode for the Higgs boson: h->G'+neutralino->Z+2G'. Then we study the observability of this decay channel at the LHC and find that it is not accessible at the finished 8 TeV run (25 fb^{-1}) or 14 TeV run with 100 fb^{-1}, but could be observed at the high luminosity LHC (14 TeV, 1000-3000 fb^{-1}).
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http://arxiv.org/abs/1301.5479
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