Speaker
Mr
Biswaranjan Das
(Indian Institute of Technology Guwahati, India)
Description
The ATLAS and CMS collaborations independently discovered a
Higgs-like particle with mass $M_h \sim$ 125 GeV and properties
similar to that predicted by the Standard Model (SM) at the Large
Hadron Collider (LHC) in 2012. Although the measurements so far
indicate that the newly discovered particle is compatible with
the SM predictions, however due to some uncertainties in few of
the Higgs detection channels, there are still possibilities of
testing this object as being a candidate for some Beyond the SM
(BSM) physics scenarios, for example, the CP-conserving Minimal
Supersymmetric Standard Model (CPC-MSSM). Moreover there are
unsettled issues like the hierarchy problem, which add more
objectives to go for the BSM scenarios. In the present work, we
evaluate the modifications of these CPC-MSSM results when
CP-violating (CPV) phases are introduced explicitly, leading to
the CP-violating MSSM (CPV-MSSM). We investigate the role of the
CPV phases of (some of) the soft Supersymmetry (SUSY) terms
(viz., the gluino mass $M_1$ and the trilinear Higgs couplings
with the sfermions $A_f, f=t,b,\tau$) on both the mass of the
lightest Higgs boson $h_1$, and the rates for the processes
$gg \rightarrow h_1 \rightarrow \gamma \gamma$,
$gg \rightarrow h_1 \rightarrow ZZ^*\rightarrow 4l$,
$gg \rightarrow h_1 \rightarrow WW^*\rightarrow l \nu l \nu$,
$pp \rightarrow V h_1 \rightarrow V b\bar b$ and
$pp \rightarrow V h_1 \rightarrow V \tau^+\tau^-$,
($V \equiv W^\pm, Z$)
at the LHC, considering the impact of the flavor constraints as
well as the stringent constraints coming from the Electric Dipole
Moment (EDM) measurements for the electron, neutron, Thallium and
Mercury. We find that it is possible to have
the lightest Higgs boson mass of around 125 GeV with relatively small
$\tan\beta$, large $A_t$ and a light stop, which is consistent
with the SUSY particle searches at the LHC. We show that the
imaginary part of the top and bottom Yukawa couplings can take
small but non-zero values even after satisfying the recent updates
from both the ATLAS and CMS collaborations within 1-2$\sigma$
uncertainties which might be a stong signature of the CP violation
to look for at the future run of the LHC. Our analysis shows that
the CPV-MSSM could be an equally potent solution (like the CPC-MSSM)
to the recent LHC Higgs data, in fact offering very little
in the way of distinction 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 MSSM Higgs sector.
| Oral or Poster Presentation | Oral |
|---|
Authors
Dr
Amit Chakraborty
(Tata Institute of Fundamental Research, India)
Mr
Biswaranjan Das
(Indian Institute of Technology Guwahati, India)
Prof.
Dilip Kumar Ghosh
(Indian Association for the Cultivation of Science, India)
Dr
J. Lorenzo Diaz-Cruz
(Benemerita Universidad Autonoma de Puebla, Puebla, Mexico)
Dr
Poulose Poulose
(Indian Institute of Technology Guwahati, India)
Prof.
Stefano Moretti
(University of Southampton, UK)
