arXiv subjects

M. Saigo

Publications and source records attributed to M. Saigo.

3 recordsLinked to original sources

arXiv2010

Physics at Super B Factory

This report presents the results of studies that investigate the physics reach at a Super $B$ factory, an asymmetric-energy $e^+e^-$ collider with a design luminosity of $8 \times 10^{35}$ cm$^{-2}$s$^{-1}$, which is around 50 times as large as the peak luminosity achieved by the KEKB collider. The studies focus on flavor physics and CP violation measurements that could be carried out in the LHC era. The physics motivation, key observables, measurement methods and expected precisions are presented.

hep-ex↗

arXiv2004

Study of the Suppressed Decays $B^- \to [K^+π^-]_D K^-$ and $B^- \to [K^+π^-]_D π^-$

We report a study of the suppressed decays $B^- \to [K^+π^-]_D K^-$ and $B^- \to [K^+π^-]_D π^-$, where $[K^+π^-]_D$ indicates that the $K^+π^-$ pair originates from a neutral $D$ meson. These decay modes are sensitive to the Unitarity Triangle angle $ϕ_3$. We use a data sample containing 275 million $B\bar{B}$ pairs recorded at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric $e^+e^-$ storage ring. The signal for $B^- \to [K^+π^-]_D K^-$ is not statistically significant, and we set a limit $r_B < 0.27$ at 90% confidence level, where $r_B$ is the magnitude of the ratio of amplitudes $| A(B^- \to \bar{D}^0K^-) / A(B^- \to D^0K^-) |$. We observe a signal with $6.4σ$ statistical significance in the related mode, $B^- \to [K^+π^-]_D π^-$.

hep-ex↗

arXiv2004

Physics at Super B Factory

This report presents the results of studies that investigate the physics reach at a Super B factory, an asymmetric-energy e^+e^- collider with a design luminosity of 5 x 10^35 cm^-2s^-1, which is around 40 times as large as the peak luminosity achieved by the KEKB collider. The studies focus on flavor physics and CP violation measurements that could be carried out in the LHC era. The physics motivation, key observables, measurement methods and expected precisions are presented. The sensitivity studies are a part of the activities associated with the preparation of a Letter of Intent for SuperKEKB, which has been submitted recently.

hep-ex↗