Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

A Study of Large $\sin2\Phi_{B_s}$ with High Mass Fourth Generation ${t'}$

Jul 16, 2009, 3:50 PM
15m
Large Lecture - Hall A (Kraków, Poland)

Large Lecture - Hall A

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Flavour Physics II. Flavour Physics

Speaker

Dr CHIEN-YI MA (NATIONAL TAIWAN UNIVERSITY)

Description

The Standard Model predicts the CP violation phase $\Phi^{\rm SM}_{B_s}= \arg M_{12} \simeq \arg(V^*_{ts}V_{tb})$ in $B_s$--$\bar B_s$ mixing is very small, of ${\cal}O(\lambda^2\eta) \simeq -0.02$, any finite value of $\Phi_{B_s}$ measured at the Tevatron would mean New Physics. Recent hints for finite $\sin2\Phi_{B_s}$ have appeared from CDF and D$\O$ experiments at the Tevatron Run II. We consider the possibility to account for it with the 4th generation $t'$ quark. Considering recent direct search bounds, we set the mass to be near the unitarity bound of 600 GeV. Combining the measurement values of $\Delta m_{B_s}$ with ${\cal B}(B_d\to X_s\ell^+\ell^-)$, together with typical $f_{B_s}$ values, we find a sizable $\sin2\Phi^{\rm SM4}_{B_s}\sim -0.3$. Using a typical value of $m_{b'}=580$ GeV, we get a narrow range of values, $0.089<|V_{t'b}|<0.100$, from the constraints $\Gamma(Z\to b\bar b)/\Gamma(Z\to{\rm hadrons})$, ${\cal B}(K^+\to\pi^+\nu\bar\nu)$ and $\Delta m_{D^0}$. Finally, we use the ZFITTER code to check the global fit deviation.

Primary author

Dr CHIEN-YI MA (NATIONAL TAIWAN UNIVERSITY)

Co-author

Prof. WEI-SHU HOU (NATIONAL TAIWAN UNIVERSITY)

Presentation materials