Gautam Bhattacharyya, Anirban Kundu, Tirtha Sankar Ray
We study the impact of the measurements of three sets of observables on the parameter space of the constrained minimal supersymmetric Standard Model (cMSSM), and on its slightly general variant, the non-universal scalar model (NUSM): (i) the direct measurement of the Higgs boson mass $m_h \approx 125$ GeV at the CERN Large Hadron Collider (LHC); (ii) Z boson decay width in the $b \bar{b}$ channel normalized to its hadronic width ($R_b$), and the forward-backward asymmetry on the $Z$-peak in the same channel $(A_{FB}^b)$; and (iii) several B-physics observables, along with $(g-2)$ of muon. In addition, there are constraints from non-observation of superparticles from direct searches at the LHC. In view of the recently re-estimated standard model value of $R_b$ with improved higher order corrections, which now opened a 2.4$\sigma$ discrepancy with its experimentally measured value at the Large Electron Positron collider (LEP), we specifically highlight how the tension between the constraints listed under (i) and (ii) is projected on the cMSSM and NUSM parameter space, and how the tension is eased only marginally for the latter.
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http://arxiv.org/abs/1306.0344
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