6,778 research outputs found
Searching for new physics in the angular distribution of B^0 -> phi K^* decay
Motivated by the possible discrepancy between the observed CP asymmetry and
that of standard model expectation in the decay mode B^0 -> phi K_S, we study
the corresponding vector vector decay mode B^0 -> phi K^*. In order to obtain
decisive information regarding the CP violating effect, we made the angular
distribution analysis of the decay products, where both the outgoing vector
mesons decay into two pseudoscalars. Furthermore, we study the possible effects
of new physics using the angular distribution observables.Comment: LaTex, 16 pages, 1 figur
Explaining B \to K pi anomaly with non-universal Z' boson
We study the effect of non-universal boson in the decay modes . In the standard model these modes receive dominant contributions from QCD penguins. Therefore, in this limit one expects , and . The corrections due to the presence of small non-penguin
contributions is found to yield and . However, the measured value of is
less than and . We show the
model with a non-universal boson can successfully explain these anomalies.Comment: 11 pages, 3 figure
Implications of lepton nonuniversality in the beauty sector
The phenomenon of CP violation in the standard model (SM) framework and the
decay dynamics have been established from the data obtained from the B
factories and so far we have not seen anything new. Nevertheless, there have
been instances of deviations in many measured observables in the flavor sector,
as far as the data and predictions are concerned. Here we will mention some
deviations obtained in measurements related to lepton universality, as seen
from the data, and try to understand their implications. To accommodate the
observed data we will consider a leptoquark model, which seems to be one
interesting model beyond the SM.Comment: 6 pages, 4 figures, talk given at BEACH 2016, George Mason
University, Fairfax, Virginia, USA, June 201
mixing and transitions in isosinglet down quark model
The recent observation of the mass difference in system seems to be not
in complete agreement with the corresponding standard model value. We consider
the model with an extra vector like down quark to explain this discrepancy and
obtain the constraints on the new physics parameters. Thereafter, we show that
with these new constraints this model can successfully explain other observed
deviations associated with transitions, namely, ,
and .Comment: 19 pages, 6 figure
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.
Study of FCNC mediated rare B_s decays in a single universal extra dimension scenario
We study the rare semileptonic and radiative leptonic B_s decays in the
universal extra dimension model. In this scenario, with a single extra
dimension, there exists only one new parameter beyond those of the standard
model, which is the inverse of the compactification radius R. We find that with
the additional contributions due to the KK modes the branching ratios of the
rare B_s decays are enhanced from their corresponding standard model values and
the zero point of the forward backward asymmetries are shifted towards the
left.Comment: 19 pages, 7 figures, version to appear in Phys. Rev.
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