The dark side of mSUGRA

BC Allanach, CG Lester, AM Weber

OAI: oai:www.repository.cam.ac.uk:1810/223954

We study the mu<0 branch of the minimal supergravity ansatz of the minimal supersymmetric standard model. The extent to which mu<0 is disfavoured compared to mu>0 in global fits is calculated with Markov Chain Monte Carlo methods and bridge sampling. The fits include state-of-the-art two-loop MSSM contributions to the electroweak observables M_W and sin^2 theta_w^l, as well as the anomalous magnetic moment of the muon (g-2)_mu, the relic density of dark matter and other relevant indirect observables. mu<0 is only marginally disfavoured in global fits and should be considered in mSUGRA analyses. We estimate that the ratio of probabilities is P(mu<0) / P(mu>0)=0.07-0.16.

supersymmetric standard model cosmology of theories beyond the SM Supersymmetry Phenomenology supersymmetric effective theories SUPERGRAVITY GRAND UNIFICATION STANDARD MODEL RELIC DENSITY HIGGS SECTOR NEUTRALINO SUPERSYMMETRY MSSM COANNIHILATION program MATTER