125 GeV Higgs signal at the LHC in theCP-violating MSSM

Abstract

The ATLAS and CMS collaborations have observed independently at the Large Hadron Collider (LHC) a new Higgs-like particle with a mass M h ∼ 125 GeV and properties similar to that predicted by the Standard Model (SM). Although the measurements indicate that this Higgs-like boson is compatible with the SM hypothesis, however due to large uncertainties in some of the Higgs detection channels, one still has the possibility of testing this object as being a candidate for some Beyond the SM (BSM) physics scenarios, for example, the Minimal Supersymmetric Standard Model (MSSM), in the CP-conserving version (CPC-MSSM). In this paper, we evaluate the modifications of these CPC-MSSM results when CP-violating (CPV) phases are turned on explicitly, leading to the CP-violating MSSM (CPV-MSSM). We investigate the role of the CPV phases in (some of) the soft Supersymmetry (SUSY) terms on both the mass of the lightest Higgs boson h 1 , and the rates for the processesat the LHC, considering the impact of the flavor constraints as well as the constraints coming from the Electric Dipole Moment (EDM) measurements. We find that it is possible to have a Higgs mass of about 125 GeV with relatively small tan β, large A t and a light stop, which is consistent with the current SUSY particle searches at the LHC. We obtain that the imaginary part of the top and bottom Yukawa couplings can take very small but non-zero values even after satisfying the recent updates from both the ATLAS and CMS collaborations within 1-2σ uncertainties which might be an interesting signature to look for at the future run of the LHC. Our study shows that the CPV-MSSM provides an equally potential solution (like its CP-conserving (CPC) counterpart) to the recent LHC Higgs data, in fact offering very little in the way of distinction arXiv:1301.2745v3 [hep-ph] 15 Aug 2014 between these two SUSY models (CPC-MSSM and CPV-MSSM) at the 7 and 8 TeV run of the LHC. Improvement in different Higgs coupling measurements is necessary in order to test the possibility of probing the small dependence on these CPV phases in the Higgs sector of the MSSM.

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

“…As for case (2), taking into account that the charged Higgs mass is limited to be above 200 GeV (see e.g. [99,132] and references therein) the fact that its loop contribution is suppressed by a factor of (M W /M H ± ) 2 and thatĝ hH + H − is of the order of the electroweak coupling (contrary to theĝ hSS coupling for squarks and sleptons which can be large as we discuss below), we have found that the contribution from charged Higgs bosons is generally negligible. In case (3), the chargino contribution can be bigger than that of the charged Higgs, because of the ratio F 1/2 : F 0 ≃ 4 and because the chargino has a lower mass limit of approximately 100 GeV (coming from LEP2 [133]).…”

Robustness of dark matter constraints and interplay with collider searches for New Physics

“…It was shown in [108][109][110] that CP violation does not have important consequences on the dark matter sector after imposing the experimental constraints from the electric dipole moments and the Higgs coupling measurements, so that the results presented in the following will remain valid also for CP violating scenarios. We impose the lightest neutralino to be the lightest supersymmetric particle which constitutes dark matter, using the set-up presented in [111,112].…”

Top Yukawa coupling measurement with indefiniteCPHiggs ine+e−→tt¯Ananthanarayan1, Garg2, Kim3 et al. 2014Phys. Rev. DSelf Cite12080View full textAdd to dashboardCite

“…Inclusion of CP violation in the Higgs sector of such models allows CP-mixed physical scalars. The phenomenology of such a possibility has been considered in the literature [26][27][28][29][30]. In a recent study [31], it has been pointed out that the ILC is an ideal setting to probe the CP nature of the Higgs boson in the process considered here.…”