T. Yoshikawa

A Possibility of large electroweak penguin contribution in B ---> K pi modes

I discuss about a possibility of large electroweak penguin contribution in B --> K pi. To satisfy several relations among the branching ratios, we need large electroweak penguin contribution. The magnitude is larger than the theoretical estimation in the SM so that it may be including some new physics effects.

A Systematic analysis of the lepton polarization asymmetries in the rare B decay, B ---> X(s) tau+ tau-

The most general model-independent analysis of the lepton polarization asymmetries in the rare B decay,

Model-independent analysis of the rare B decay B → X s l + l −

\Bstt

Using B(s)0 decays to determine the CP angles alpha and gamma

, is presented. We present the longitudinal, normal and transverse polarization asymmetries for the

Searching for new physics in the b→d FCNC using Bs0(t)→φKS and

\tau^+

What can we learn fromφ1andBd0→π+π−?

and

THE EFFECTS OF NONLOCAL INTERACTIONS IN RARE B DECAYS, B→Xsl+l-

\tau^-

Searching for New Physics in the b->d FCNC using B_s^0(t)->\phi K_s and B_d^0(t)->K^0\bar{K}^0

, and combinations of them, as functions of the Wilson coefficients of twelve independent four-Fermi interactions, ten of them local and two nonlocal. These procedures will tell us which type of operators contributes to the process. And it will be very useful to pin down new physics systematically, once we have the experimental data with high statistics and a deviation from the Standard Model is found.

Searching for new physics in the b ---> d FCNC using B0(s)(t) ---> phi anti-K0 and B0(d)(t) ---> K0 anti-K0

The most general model-independent analysis of the rare B decay

What can we learn from phi1 and B0d-->pi+pi-?

\stackrel{\ensuremath{\rightarrow}}{B}{X}_{s}{l}^{+}{l}^{\ensuremath{-}}