Broken R-Parity in the Sky and at the LHC

Details Broken R-Parity in the Sky and at the LHC Broken R-Parity in the Sky and at the LHC

2010-07-28

arxiv.org/abs/1007.5007v2

JHEP 1010:061,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 8 figures; v2: published version, reference added

Scientific paper

10.1007/JHEP10(2010)061

Supersymmetric extensions of the Standard Model with small R-parity and lepton number violating couplings are naturally consistent with primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter. We consider supergravity models with universal boundary conditions at the grand unification scale, and scalar tau-lepton or bino-like neutralino as next-to-lightest superparticle (NLSP). Recent Fermi-LAT data on the isotropic diffuse gamma-ray flux yield a lower bound on the gravitino lifetime. Comparing two-body gravitino and neutralino decays we find a lower bound on a neutralino NLSP decay length, $c \tau_{\chi^0_1} \gsim 30 cm$. Together with gravitino and neutralino masses one obtains a microscopic determination of the Planck mass. For a stau-NLSP there exists no model-independent lower bound on the decay length. Here the strongest bound comes from the requirement that the cosmological baryon asymmetry is not washed out, which yields $c \tau_{\tilde\tau_1} \gsim 4 mm$. However, without fine-tuning of parameters, one finds much larger decay lengths. For typical masses, $m_{3/2} \sim 100 GeV$ and $m_{NLSP} \sim 150 GeV$, the discovery of a photon line with an intensity close to the Fermi-LAT limit would imply a decay length $c\tau_{NLSP}$ of several hundred meters, which can be measured at the LHC.

Affiliated with

Also associated with

No associations

Rating

Broken R-Parity in the Sky and at the LHC does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Broken R-Parity in the Sky and at the LHC, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broken R-Parity in the Sky and at the LHC will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-74595