A. Satpathy | Searcharxiv

arXiv2004

Direct CP Violation - Recent Results from Babar

Measurements of the CKM parameter $\sin(2 β)$ have established $CP$ violation in the $B^0$ meson system arising from the interference between mixing and decay. However, direct CP violation, arising from the interference among different terms in the decay amplitude, had not been observed so far. We report a first observation of direct CP violation in $B^{0} \to K^{+} π^{-}$ decays with the BaBar detector. Other selected results based on the search for direct CP violation in several other B decays are also presented.

hep-ex↗

arXiv2002

Study of $\bar{B^{0}} \to D^{(*)0} π^+ π^-$ Decays

We report on a study of $\bar{B^{0}} \to D^{(*) 0} π^+ π^-$ decays using 29.1 fb$^{-1}$ of $e^{+}e^{-}$ annihilation data recorded at the $Υ(4S)$ resonance with the Belle detector at the KEKB storage ring. Making no assumptions about the intermediate mechanism, the branching fractions for $\bar{B}^0 \to D^0 π^+ π^-$ and $\bar{B}^0 \to D^{* 0} π^+ π^-$ are determined to be $(8.0 \pm 0.6 \pm 1.5) \times 10^{-4} $ and $ (6.2 \pm 1.2 \pm 1.8) \times 10^{-4}$ respectively. An analysis of $\bar{B^{0}} \to D^{0} π^+ π^-$ candidates yields to the first observation of the color-suppressed hadronic decay $\bar{B}^0 \to D^0 ρ^0$ with the branching fraction $(2.9 \pm 1.0 \pm 0.4) \times 10^{-4}$. We measure the ratio of branching fractions ${\mathcal B}(\bar{B^0} \to D^0 ρ^0) / {\mathcal B}(\bar{B^0} \to D^0 ω)$ = 1.6 $\pm$ 0.8.

hep-ex↗