19 research outputs found
Probing new physics in B -> f_0(980) K decays
We study the hadronic decay modes ,
involving a scalar and a pseudoscalar meson in the final state. These decay
modes are dominated by the loop induced penguins
along with a small tree level transition (for )
and annihilation diagrams. Therefore, the standard model expectation of direct
CP violation is negligibly small and the mixing induced CP violation parameter
in the mode is expected to give the same value of
, as extracted from but with opposite sign.
Using the generalized factorization approach we find the direct CP violation in
the decay mode to be of the order of few percent. We then
study the effect of the R-parity violating supersymmetric model and show that
the direct CP violating asymmetry in could be as large
as and the mixing induced CP asymmetry in (i.e.,
) could deviate significantly from that of .Comment: 18 pages, 5 figures, version to appear in Phys. Rev.
Weak phase information from the color suppressed B_d^0 -> D^{*0} K^{*0} modes
The decay channels are investigated for extracting
weak phase information. These channels are described by color-suppressed
tree diagrams only and are free from penguin contributions. The branching
ratios for these channels are found to be
which can be measured at the currently running factories. The method
presented here may be well-suited to determine the phase .Comment: 11 pages, revised extensively, version to appear in Phys. Rev.
Signature of new physics in B -> phi pi decay
We investigate the effect of an extra fourth quark generation and FCNC
mediated and bosons on the rare decay mode . In
the standard model, this mode receives only penguin contributions and
therefore, highly suppressed with branching ratio . This
in turn makes this mode a very sensitive probe for new physics. We find that
due to the above mentioned new physics contributions there is a significant
enhancement in its branching ratio. Furthermore, the direct CP violation
parameter which is identically zero in the SM is found to be quite significant.
If this mode will be observed in the upcoming LHCb experiment, it will not only
provide a clear signal of new physics but also can be used to constrain the new
physics parameter space.Comment: 13 pages, 3 figures, version to appear in Phys. Lett.
Solid-state synthesis of stable and color tunable cesium lead halide perovskite nanocrystals and the mechanism of high-performance photodetection in a monolayer MoS<sub>2</sub>/CsPbBr<sub>3</sub>vertical heterojunction
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Not AvailableComparison of agarose gel electrophoresis and RNA-PAGE for rapid detection of rotavirus from faecal samples.Not Availabl