156 research outputs found
Implications of a Running Dark Photon Coupling
For an "invisible" dark photon that dominantly decays into dark states,
the running of its fine structure constant with momentum transfer could be significant. A similar running in the kinetic mixing
parameter can be induced through its dependence on
. The running of couplings could potentially be detected in "dark
matter beam" experiments, for which theoretical considerations imply .Comment: 4 pages, 4 figures. Contributed to the 11th Patras Workshop on
Axions, WIMPs and WISPs, Zaragoza, Spain, June 22-26, 201
Signals of Warped Top-Condensation in B-Decays
A recently proposed warped top-condensation model generally predicts a light
radion \phi, with a mass of a few GeV or less, whose interactions are
suppressed by a scale of order 100 TeV. In this talk, we present existing
constraints and potential signals from the process b \to s \phi, in the context
of such a model. Astrophysical bounds, applicable to very light radions, are
also briefly discussed.Comment: Talk given at the SUSY 2009 conference, held at Northeastern
University, Boston, MA, USA, June 5-10, 2009. 4 page
Compton Scattering at the NLC and Large Extra Dimensions
We study Compton scattering, gamma e -> gamma e, in the context of the recent
proposal for Weak Scale Quantum Gravity (WSQG) with large extra dimensions. It
is shown that, with an ultraviolet cutoff TeV for the effective
gravity theory, the cross section for this process at the Next Linear Collider
(NLC) deviates from the prediction of the Standard Model significantly. Our
results suggest that, for typical proposed NLC energies and luminosities, WSQG
can be tested in the range 4 TeV\lsim M_S \lsim 16 TeV, making gamma e ->
gamma e an important test channel.Comment: Latex, 15 pages, 7 figures. New results, figures, and references
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