Higgs decay to goldstini and its observability at the LHC

Abstract

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'+χ-> Z+2G'. Then in an effective model with conservative fixed parameters 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) or 14 TeV run with 100 /fb, but might be observed at the high luminosity LHC (14 TeV, 1000-3000 /fb) if the systematics of the backgrounds can be well understood.

Discussions added, version in PLB

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Cited by in corpus (12)

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• Pseudo-goldstino and electroweakinos via VBF processes at LHC
• Pseudo-goldstino and electroweak gauginos at the LHC
• Z-peaked excess in goldstini scenarios
• An explicit calculation of pseudo-goldstino mass at the leading three-loop level
• Multiphoton signatures of goldstini at the LHC
• Multilepton and multiphoton signatures of supersymmetry at the LHC
• Enhanced Higgs pair production from higgsino decay at the HL-LHC
• Aspects of astrophysical particle production and beyond the Standard Model phenomenology