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A SM-like Higgs near 125 GeV in low energy SUSY: a comparative study for MSSM and NMSSM

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Abstract

Motivated by the recent LHC hints of a Higgs boson around 125 GeV, we assume a SM-like Higgs with the mass 123-127 GeV and study its implication in low energy SUSY by comparing the MSSM and NMSSM. We consider various experimental constraints at 2σ level (including the muon g − 2 and the dark matter relic density) and perform a comprehensive scan over the parameter space of each model. Then in the parameter space which is allowed by current experimental constraints and also predicts a SM-like Higgs in 123-127 GeV, we examine the properties of the sensitive parameters (like the top squark mass and the trilinear coupling A t ) and calculate the rates of the di-photon signal and the V V * (V = W, Z) signals at the LHC. Our typical findings are: (i) In the MSSM the top squark and A t must be large and thus incur some fine-tuning, which can be much ameliorated in the NMSSM; (ii) In the MSSM a light stau is needed to enhance the di- photon rate of the SM-like Higgs to exceed its SM prediction, while in the NMSSM the di-photon rate can be readily enhanced in several ways; (iii) In the MSSM the signal rates of pp → h → V V * at the LHC are never enhanced compared with their SM predictions, while in the NMSSM they may get enhanced significantly; (iv) A large part of the parameter space so far survived will be soon covered by the expected XENON100(2012) sensitivity (especially for the NMSSM).

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Authors and Affiliations

  1. Department of Physics, Henan Normal University, Xinxiang, 453007, China

    Junjie Cao, Zhaoxia Heng & Yanming Zhang

  2. Center for High Energy Physics, Peking University, Beijing, 100871, China

    Junjie Cao

  3. State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Academia Sinica, Beijing, 100190, China

    Jin Min Yang & Jingya Zhu

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  1. Junjie Cao
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Cao, J., Heng, Z., Yang, J.M. et al. A SM-like Higgs near 125 GeV in low energy SUSY: a comparative study for MSSM and NMSSM. J. High Energ. Phys. 2012, 86 (2012). https://doi.org/10.1007/JHEP03(2012)086

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