Limits on Split Supersymmetry from Gluino Cosmology
نویسندگان
چکیده
An upper limit on the masses of scalar superpartners in split supersymmetry is found by considering cosmological constraints on long-lived gluinos. Over most of parameter space, the most stringent constraint comes from big bang nucleosynthesis. A TeV mass gluino must have a lifetime of less than 100 seconds to avoid altering the abundances of D and Li. This sets an upper limit on the supersymmetry breaking scale mS of 10 9 GeV. The work of AP is supported by the U.S. Department of Energy under contract number DE-AC0276SF00515. JGW is supported by National Science Foundation Grant PHY-9870115 and by the Stanford Institute for Theoretical Physics.
منابع مشابه
Gluino Decays in Split Supersymmetry
We compute the gluino lifetime and branching ratios in Split Supersymmetry. Using an effective–theory approach, we resum the large logarithmic corrections controlled by the strong gauge coupling and the top Yukawa coupling. We find that the resummation of the radiative corrections has a sizeable numerical impact on the gluino decay width and branching ratios. Finally, we discuss the gluino deca...
متن کاملProbing Split Supersymmetry with Cosmic Rays
A striking aspect of the recently proposed split supersymmetry is the existence of heavy gluinos which are metastable because of the very heavy squarks which mediate their decay. In this paper we correlate the expected flux of these particles with the accompanying neutrino flux produced in inelastic pp collisions in distant astrophysical sources. We show that an event rate at the Pierre Auger O...
متن کاملGluino decays with heavier scalar superpartners
We compute gluino decay widths in supersymmetric theories with arbitrary flavor and CP violation angles. Our emphasis is on theories with scalar superpartner masses heavier than the gluino such that tree-level two-body decays are not allowed, which is relevant, for example, in split supersymmetry. We compute gluino decay branching fractions in several specific examples and show that it is plaus...
متن کاملBaryogenesis with Superheavy Squarks
We consider a setup where R-parity is violated in the framework of split supersymmetry. The out-of-equilibrium decays of heavy squarks successfully lead to the generation of a baryon asymmetry. We restrict the R-parity violating couplings to the baryon number violating subset to keep the neutralino sufficiently stable to provide the dark matter. The observed baryon asymmetry can be generated fo...
متن کاملSplit Supersymmetry in Unified Models
In the context of split supersymmetry, the gaugino mass spectrum seems to be very important to satisfy the dark matter content of the universe and the gauge coupling unification. In this paper, we have considered various sources of gaugino masses in the context of unified models. We show that the gaugino mass spectrum varies in different unification pictures. In the context of SU(5), we have fo...
متن کامل