arXiv subjects

K. Hosokawa

Publications and source records attributed to K. Hosokawa.

56 records · Page 4Linked to original sources

arXiv2002

$|V_{ub}|$ determination by $B \to D_s π$

We investigate $\ovar{B^0} \to D_s^- π^+$ decay in perturbative QCD approach which has recently been applied to $B$ meson decays. $\ovar{B^0} \to D_s^- π^+$ decay (and its charge conjugated mode) can be one of the hopeful modes to determine $|V_{ub}|$ since it occurs through $b \to u$ transition only. We estimate both factorizable and non-factorizable contribution, and show that the non-factorizable contribution is much less than the factorizable one. Our calculation gives ${BR}(\ovar{B^0} \to D_s^- π^+) = (50 \sim 70) \times f_{Ds}^2|{V_{ub}}{V_{cs}}|^2$.

hep-ph↗

arXiv2001

Updates of $W_R$ effects on CP angles determination in B decays

The recently observed CP violation in B decay and $B$-$\ovar{B}$ mixing data put constraints on the mass of $W_R$ and the parameters of the right-handed current quark mixing matrix $V^R$ in $SU(2)_L \times SU(2)_R\times U(1)$ gauge model. It is shown that the allowed region of parameters are severely restricted for light $W_R$ with mass on the order of 1 TeV. There exist sets of parameters which can accommodate large CP violation as measured by Belle, $\sin2ϕ_1|_{exp}\simeq 1$, for $M_{W_R}=1 \sim 10$ TeV.

hep-ph↗