New physics hints in B decays and collider outlook
GEORGE W S HOU
Department of Physics,
Republic of
E-mail: wshou@phys.ntu.edu.tw
Abstract. There
are currently two hints for new physics involving CP
violation in $b\to s$ transitions:
$\Delta {\cal S} \equiv {\cal S}_f
- {\cal S}_{J/\psi
K} \neq 0$, and difference in direct CP asymmetry
$\Delta {\cal A}_{K\pi} \equiv
{\cal A}_{K^+\pi^0} - {\cal
A}_{K^+\pi^-} \neq
0$. We explore the two scenarios with a large and
unique new CP phase in $b\leftrightarrow s$ transitions. Motivated by
$\Delta S \neq 0$, we update on
the right-handed strange-beauty
squark $\widetilde{sb}_{\rm 1R}$ at TeV scale. Motivated
by $\Delta
{\cal A}_{K\pi} \neq 0$, we explore sequential fourth generation $t'$
and $b'$ quarks. Both scenarios can
survive constraints such as SM
level $b\to s\gamma,\ s\ell\ell$
and $B_{\rm s}$ mixing, and predict
sizable CP violation in $B_{\rm s}$ mixing. The fourth generation
picture predicts sizable $K_{\rm L} \to \pi^0\nu\nu$. Direct search
for $\widetilde{sb}_{\rm R}$, $b'$ and $t'$ at hadronic colliders,
such as Tevatron
Run II and LHC, can complement further CP violation
studies at these machines, as well
as at the future Super $B$
factory.
Keywords. $B$ physics; flavor; CP violation;
beyond
Standard Model; rare decays; supersymmetry; fourth generation; collider.
PACS Nos 11.30.Er; 11.30.Hv; 12.60.Cn; 12.60.-i; 12.60.Jv;
13.25.Hw