7,080 research outputs found
New Physics and novel Higgs signals
We review some of the results of our recent work dealing with the novel type
of Higgs signals that arise when one considers extensions of the standard
model.
We discuss first possible deviations on the Higgs couplings due to heavy
particles, in the context of the MSSM and with large extra-dimensions. Then, we
present several models where it is possible to induce flavor violating Higgs
couplings, and probe them at future hadron colliders through the LFV Higgs
decay h-> tau mu or with rare top decays.Comment: Talk given at the X Mexican School of Particles and Fields, Playa del
Carmen, Mexico, 200
Top-Quark FCNC Decay t->cgg in Topcolor-assisted Technicolor Model
The topcolor-assisted technicolor (TC2) model predicts several pseudo-scalars
called top-pions and at loop level they can induce the FCNC top quark decay
t->cgg which is extremely suppressed in the Standard Model (SM). We find that
in the allowed parameter space the TC2 model can greatly enhance such a FCNC
decay and push the branching ratio up to 10^{-3}, which is much larger than the
predictions in the SM (10^{-9}) and in the minimal supersymmetric model
(10^{-4}). We also compare the result with the two-body FCNC decay t-> cg and
find that the branching ratio of t-> cgg is slightly larger than t-> cg. Such
enhanced FCNC top quark decays may serve as a good probe of TC2 model at the
future top quark factory.Comment: 11 pages, 4 figure
Search for the Lepton Flavour Violating Higgs decay H --> tau mu at Hadron Colliders
We study the prospects to detect at hadron colliders the Lepton Flavour
Violating Higgs decay H --> tau mu, which can reach substantial branching
fractions in several extensions of the SM. Among them, the generic two higgs
doublet model can be taken as a representative case where B.R.(H --> tau mu)
can reach values of order 10^-1-10^-2. Bounds on the LFV factor kappa_{tau mu}
of order 0.8-1.7 can be derived at 95% c.l. at Tevatron Run-2 with 4 fb^-1 for
m_H = 110-150 GeV.Comment: 3 pages, 1 figure, uses RevTeX4. Contribution to Snowmass 200
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