54 research outputs found
Exploring SUSY light Higgs boson scenarios via dark matter experiments
We examine the dark matter phenomenology in supersymmetric light higgs boson
scenarios, adapting nonuniversal Higgs masses at the gauge coupling unification
scale. The correct relic density is obtained mostly through the annihilation
into a pseudoscalar , which gives high values for the self-annihilation
cross-section at present times. Our analysis shows that most part of the
pole region can produce detectable gamma-rays and antiproton signals, and still
be compatible with with recent direct detection data from XENON100 and CDMS-II.Comment: 31 pages, 5 figures. Indirect detection statistical method changed,
direct detection analysis enriched, references added, main conclusions
unchanged but extended. Version to appear on JCA
Exploring Non-Holomorphic Soft Terms in the Framework of Gauge Mediated Supersymmetry Breaking
It is known that in the absence of a gauge singlet field, a specific class of
supersymmetry (SUSY) breaking non-holomorphic (NH) terms can be soft breaking
in nature so that they may be considered along with the Minimal Supersymmetric
Standard Model (MSSM) and beyond. There have been studies related to these
terms in minimal supergravity based models. Consideration of an F-type SUSY
breaking scenario in the hidden sector with two chiral superfields however
showed Planck scale suppression of such terms. In an unbiased point of view for
the sources of SUSY breaking, the NH terms in a phenomenological MSSM (pMSSM)
type of analysis showed a possibility of a large SUSY contribution to muon
, a reasonable amount of corrections to the Higgs boson mass and a drastic
reduction of the electroweak fine-tuning for a higgsino dominated
in some regions of parameter space. We first investigate
here the effects of the NH terms in a low scale SUSY breaking scenario. In our
analysis with minimal gauge mediated supersymmetry breaking (mGMSB) we probe
how far the results can be compared with the previous pMSSM plus NH terms based
study. We particularly analyze the Higgs, stop and the electroweakino sectors
focusing on a higgsino dominated and
, a feature typically different from what appears in
mGMSB. The effect of a limited degree of RG evolutions and vanishing of the
trilinear coupling terms at the messenger scale can be overcome by choosing a
non-minimal GMSB scenario, such as one with a matter-messenger interaction.Comment: 27 pages, 9 figures, some text added, results and conclusion
unchanged, Accepted in JHE
LHC constraints on M_1/2 and m_0 in the semi-constrained NMSSM
Constraints from searches for squarks and gluinos at the LHC at sqrt{s}=8 TeV
are applied to the parameter space of the NMSSM with universal squark/slepton
and gaugino masses at the GUT scale, but allowing for non-universal soft Higgs
mass parameters (the sNMSSM). We confine ourselves to regions of the parameter
space compatible with a 125 GeV Higgs boson with diphoton signal rates at least
as large as the Standard Model ones, and a dark matter candidate compatible
with WMAP and XENON100 constraints. Following the simulation of numerous points
in the m_0-M_{1/2} plane, we compare the constraints on the sNMSSM from 3-5
jets + missing E_T channels as well as from multijet + missing E_T channels
with the corresponding cMSSM constraints. Due to the longer squark decay
cascades, lower bounds on M_{1/2} are alleviated by up to 50 GeV. For heavy
squarks at large m_0, the dominant constraints originate from multijet +
missing E_T channels due to gluino decays via stop pairs.Comment: 18 pages, 2 Tables, 3 Figure
Testing boson rare decays with , , and in the NMSSM
We study the rare decay process of boson into photon, accompanied by a
CP-even or CP-odd scalar. We present the analytical delineation of the
processes through the model-independent parametrizations of the new physics
couplings and, finally, consider the Next-to-Minimal Supersymmetric Standard
Model to mark out the parameter space where the branching fraction can have the
maximum value. As a part of the necessary phenomenological and experimental
cross-checks, we aim to fit the anomalous magnetic moment of the muon and
boson mass anomaly through the supersymmetric contributions. We also find that
the decays can serve as an excellent
complementary test to . In fact, to facilitate
future searches, we unveil a few benchmark points that additionally satisfy the
deviation of from the SM value based on the recent
measurements of ATLAS and CMS. Future proposals such as ILC, CEPC, and FCC-ee
are anticipated to operate for multiple years, focusing on center-of-mass
energy near the pole. Consequently, these projects will be capable of
conducting experiments at the Giga- ( of bosons) and Tera-
( of bosons) phases, which may probe the aforesaid rare decay
processes, thus the model as well. These unconventional yet complementary
searches offer different routes to explore the supersymmetric models with
extended Higgs sectors like NMSSM.Comment: 32 pages, 4 figure
Right Sneutrino Dark Matter and a Monochromatic Photon Line
The inclusion of right-chiral sneutrino superfields is a rather
straightforward addition to a supersymmetric scenario. A neutral scalar with a
substantial right sneutrino component is often a favoured dark matter candidate
in such cases. In this context, we focus on the tentative signal in the form of
a monochromatic photon, which may arise from dark matter annihilation and has
drawn some attention in recent times. We study the prospect of such a right
sneutrino dark matter candidate in the contexts of both MSSM and NMSSM extended
with right sneutrino superfields, with special reference to the Fermi-LAT data
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