205 research outputs found
Photon Polarization in the b->s gamma processes in the Left-Right Symmetric Model
The circular-polarization of the photon in the radiative B decays is
dominantly left-handed in the Standard Model (SM), but the right-handed
polarization may be enhanced in some new physics models with right-handed
currents, such as the Left-Right Symmetric Model (LRSM). In this article, we
investigate how large this wrong polarization could be within the allowed
parameter space of the LRSM. We show that in LRSM, the right-handed
polarization of the photon in the processes could be largely
enhanced by the mixing contributions because of the helicity flip on
the internal top quark line of the penguin diagrams and the enhancement by the
CKM factor . We discuss the sensitivity of the proposed
methods to determine the photon polarization to the LRSM as well
as their complementary role compared to the direct search of right-handed
charged gauge bosons at LHC.Comment: 30pages, 5 figures, published version; references adde
to P-Wave Charmonia Transitions in Covariant Light-Front Approach
In the covariant light-front quark model, we investigate the form factors. The form factors are evaluated in space-like
kinematic region and are recasted to the physical region by adopting the
exponential parametrization. We also study the semileptonic decays and
find that branching fractions for the decays have the order while branching fractions for
are suppressed by one order. These
predictions will be tested at the forthcoming hadron colliders.Comment: 13 pages, 1 figure, published in Phys. Rev.
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