A definitive signal of multiple supersymmetry breaking
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Author(s)
Cheung, Clifford
Mardon, Jeremy
Nomura, Yasunori
Thaler, Jesse
Date Issued
July 2010
Journal
Journal of High Energy Physics
Publisher
Springer / SISSA
Citation
Cheung, Clifford et al. “A definitive signal of multiple supersymmetry breaking.” Journal of High Energy Physics 2010.7 (2010) : n. pag.
Copyright © 2010, SISSA
Version
Author's final manuscript
Abstract
If the lightest observable-sector supersymmetric particle (LOSP) is charged and long-lived, then
it may be possible to indirectly measure the Planck mass at the LHC and provide a spectacular
confirmation of supergravity as a symmetry of nature. Unfortunately, this proposal is only feasible if
the gravitino is heavy enough to be measured at colliders, and this condition is in direct conflict with
constraints from big bang nucleosynthesis (BBN). In this work, we show that the BBN bound can
be naturally evaded in the presence of multiple sectors which independently break supersymmetry,
since there is a new decay channel of the LOSP to a goldstino. Certain regions of parameter space
allow for a direct measurement of LOSP decays into both the goldstino and the gravitino at the LHC.
If the goldstino/gravitino mass ratio is measured to be 2, as suggested by theory, then this would
provide dramatic verification of the existence of multiple supersymmetry breaking and sequestering.
A variety of consistent cosmological scenarios are obtained within this framework. In particular, if
an R symmetry is imposed, then the gauge–gaugino–goldstino interaction vertices can be forbidden.
In this case, there is no bound on the reheating temperature from goldstino overproduction, and
thermal leptogenesis can be accommodated consistently with gravitino dark matter.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/jhep07(2010)035
