A 125 GeV Higgs and its di-photon signal in different SUSY models: a mini review

In this note we briefly review our recent studies on a 125 GeV Higgs and its di-photon signal rate in different low energy supersymmetric models, namely the minimal supersymmetric standard model (MSSM), the next-to-minimal supersymmetric standard model (NMSSM), the nearly minimal supersymmetric standard model (nMSSM) and the constrained MSSM. Our conclusion is: (i) In the allowed parameter space the SM-like Higgs boson can easily be 125 GeV in the MSSM, NMSSM and nMSSM, while it is hard to realize in the constrained MSSM; (ii) The di-photon Higgs signal rate in the nMSSM and constrained MSSM is suppressed relative to the prediction of the SM, while the signal rate can be enhanced in the MSSM and NMSSM; (iii) The NMSSM may allow for a lighter top-squark than the MSSM, which can thus ameliorate the fine-tuning problem.Comment: 16 pages, 8 figures,version in Advances in High Energy Physic

The Impact of Market Timing on Canadian and U.S. Firms' Capital Structure

This paper studies the impact of market timing on Canadian firms' capital structure and makes a comparison with U.S. firms. There is no evidence that market timing affects Canadian firms' capital structure in the same manner as it affects their U.S. counterparts. The effect of past equity issues on Canadian firms' capital structure is transitory. Canadian firms adjust at a faster rate toward the leverage target than U.S. firms. These results challenge the generality of the market-timing theory of capital structure.Financial markets; International topics