7,328 research outputs found
On sgoldstino interpretation of HyperCP events
We discuss possible sgoldstino interpretation of the observation, reported by
HyperCP collaboration, of three decay events with
dimuon invariant mass 214.3 MeV within detector resolution. We find that this
interpretation is consistent in models with (i) parity conservation in
sgoldstino interactions, (ii) pseudoscalar sgoldstino of mass 214 MeV and
heavier scalar sgoldstino, and (iii) low supersymmetry breaking scale, \sqrt{F}
= 2.5-60 TeV. In these models, sgoldstino can be observed in decays
, and at the branching
ratios of at least of order 10^{-12}, 10^{-8} and 10^{-11}, respectively.
The model can be probed also at e^+e^- colliders in the channels
and , where the cross section is likely
to be in the range 1 pb - 5 ab.Comment: 14 pages, 1 figure; v2: replaced with journal version, predictions
for kaons refine
Gravitational waves from phase transition in split NMSSM
We discuss gravitational wave signal from the strongly first order
electroweak phase transition in the split NMSSM. We find that for sets of
parameters predicting successful electroweak baryogenesis the gravitational
wave signal can be within the reach of future experiments LISA, BBO and
Ultimate DECIGO.Comment: 8 pages, 2 figures, published versio
Stoponium Search at Photon Linear Collider
In some supersymmetric extensions of the Standard Model fairly light
superpartner of t-quark is predicted, which may form bound states ({\it
stoponiums}) under certain conditions. We study prospects of search for
stoponium at the future Photon Linear Collider. It is found that this machine
could be the best machine for discovery and study of these resonances at some
scenarios of supersymmetric extension of the Standard Model. In particular, if
the decay channel is dominant stoponium could be observed at the beginning
of PLC run with collision energy tuned at the stoponium mass. If this channel
is kinematically closed stoponium could be discovered in ,
and decay channels but higher statistics are needed. Effects of the
stoponium-Higgs mixing and degeneracy are briefly discussed.Comment: 11 pages, 2 figures added, corrections taken into account result in
increasing of signal significanc
Towards common origin of supersymmetry breaking, compositeness, and gauge mediation
We present a toy model which has the following properties: i) it is strongly
coupled at a certain scale and breaks supersymmetry at this scale; ii) matter
superfields of (one generation of) the Standard Model are effective low energy
degrees of freedom of this strongly coupled theory; iii) direct gauge mediation
of supersymmetry breaking occurs due to messenger superfields that are also
effective low energy degrees of freedom. We discuss the way to generalize this
approach to realistic models with three generations. These models might be
favorable from the point of view of string theory compactifications.Comment: 7 pages, LaTeX, no figures; grant numbers correcte
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