59 research outputs found
Polarized lepton pair forward-backward asymmetries in (B -> K^* l^+ l^-) decay beyond the standard model
We study the polarized lepton pair forward-backward asymmetries in (B -> K^*
l^+ l^-) decay using a general, model independent form of the effective
Hamiltonian. We present the general expression for nine double-polarization
forward-backward asymmetries. It is shown that, the study of the
forward-backward asymmetries of the doubly-polarized lepton pair is a very
useful tool for establishing new physics beyond the standard model.Comment: 29 pages, 18 figures, LaTeX formatte
Double-Lepton Polarization Asymmetries and Polarized Forward Backward Asymmetries in the Rare b \to s \ell^+ \ell^- Decays in a Single Universal Extra Dimension Scenario
We study the double-lepton polarization asymmetries and single and
double-lepton polarization forward backward asymmetries of the rare b \to s
\ell^+ \ell^- mode within the Standard Model and in the
Appelquist-Cheng-Dobrescu model, which is a new physics scenario with a single
universal extra dimension. In particular, we examine the sensitivity of the
observables to the radius R of the compactified extra-dimension, which is the
new parameter in this new physics model.Comment: 20 Pages, 15 Figures and 1 Tabl
General analysis of CP violation in polarized (b -> d l^+ l^-) decay
The CP violating asymmetries in the (b -> d l^+ l^-) decay, when one of the
leptons is polarized, is investigated using the most general form of the
effective Hamiltonian. The sensitivity of the CP violating asymmetries on the
new Wilson coefficients is studied.Comment: 25 pages, 20 figures, LaTeX formatte
Double-lepton polarizations in (B -> l^+ l^- gamma) decay
Double-lepton polarization asymmetries in the (B -> l^+ l^- gamma) decay are
calculated using the most general, model independent form of the effective
Hamiltonian including all possible forms of the interaction. The dependencies
of the asymmetries on new Wilson coefficients are investigated. The
detectability the averaged double-lepton polarization asymmetries at LHC is
also discussed.Comment: 20 pages, 7 PostScript figures, LaTeX formatte
Double-lepton polarization asymmetries in the Exclusive (B -> rho l^+ l^-) decay beyond the Standard Model
The double-lepton polarization asymmetries in (B -> rho l^+ l^-) decay is
analyzed in a model independent framework. The general expressions for nine
double-polarization asymmetries are calculated. It is shown that the study of
the double-lepton polarization asymmetries proves to be very useful tool in
looking for new physics beyond the standard model.Comment: 28 pages, 16 figures, LaTeX formatte
CP-Conserving Unparticle Phase Effects on the Unpolarized and Polarized Direct CP Asymmetry in Transition
We examine the unparticle CP-conserving phase effects on the direct CP
asymmetry for both polarized and unpolarized lepton in the inclusive transition, where the flavor changing neutral currents are
forbidden at tree level but are induced by one-loop penguin diagrams. The
averaged polarized and unpolarized CP asymmetries depict strong dependency on
the unparticle parameters. In particular, a sizable discrepancy corresponding
to the standard model is achieved when the scale dimension value is 1. We see that the unparticle stuff significantly enhances, suppresses or
changes the sign of the CP asymmetry depending on the definite value of the
scaling dimension d_{\UP}. Especially, when d_{\UP}\sim 1.1 the CP
asymmetries vanish.Comment: 10 figures, PRD Published versio
Exclusive (B -> rho l^+ l^-) decay and Polarized lepton pair forward--backward asymmetries
The polarized lepton pair forward-backward asymmetries in (B -> rho l^+ l^-)
decay using a general, model independent form of the effective Hamiltonian is
studied. The general expression for nine double-polarization forward-backward
asymmetries are calculated. The study of the forward-backward asymmetries of
the doubly-polarized lepton pair proves to be very useful tool in looking for
new physics beyond the standard model.Comment: 23 pages, 12 figures, LaTeX formatte
Double-lepton polarization asymmetries in the (B -> K l^+ l^-) decay beyond the Standard Model
General expressions for the double-lepton polarizations in the (B -> K l^+
l^-) decay are obtained, using model independent effective Hamiltonian,
including all possible interactions. Correlations between the averaged
double-lepton polarization asymmetries and the branching ratio, as well as, the
averaged single-lepton polarization asymmetry are studied. It is observed that,
study of the double-lepton polarization asymmetries can serve as a good test
for establishing new physics beyond the Standard Model.Comment: 21 pages, 18 figures, LaTeX formatte
The Effects of Fourth Generation on the double Lepton Polarization in B \rar K \ell^+ \ell^- decay
This study investigates the influence of the fourth generation quarks on the
double lepton polarizations in B \rar K \ell^+ \ell^- decay. Taking
|V_{t's}V_{t'b}|\sim \{0.01-0.03\} with phase about 100^\circ, which is
consistent with the b\to s\ell^+\ell^- rate and the B_s mixing parameter Delta
m_{B_s}$, we obtain that the double lepton(muon and tau) polarizations are
quite sensitive to the existence of fourth generation. It can serve as a good
tool to search for new physics effects, precisely, to indirect search for the
fourth generation quarks(t', b').Comment: 30 pages, 27 figure
Double-Lepton Polarization Asymmetries and Branching Ratio in B \rar K_{0}^{*}(1430) l^+ l^- transition from Universal Extra Dimension Model
We investigate the B \rar K_{0}^{*}(1430) l^+ l^- transition in the
Applequist-Cheng-Dobrescu model in the presence of a universal extra dimension.
In particular, we calculate double lepton polarization asymmetries and
branching ratio related to this channel and compare the obtained results with
the predictions of the standard model. Our analysis of the considered
observables in terms of radius of the compactified extra-dimension as the
new parameter of the model show a considerable discrepancy between the
predictions of two models in low values.Comment: 12 Pages, 15 Figures and 1 Tabl
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