2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

Measurements of charmless B decays at Belle

4 Jul 2014, 12:00
Sala 8+9 ()

Sala 8+9

Oral presentation Flavour Physics Flavour Physics


Dr. Marko Petric (Jozef Stefan Institute)


We report measurements of the branching fraction (BF) and CP asymmetry ($A_{CP}$) for three rare charmless decays $B^0 \to \pi^0 \pi^0$, $B^0 \to \eta^0 K^{*}(892)^{0}$ and $B^+ \to \bar{K}^{*}(892)^{0} K^{*}(892)^{+}$. Previous measurements of the BF($B^0 \to \pi^0 \pi^0$) are significantly larger than theoretical expectations. The measured BF and $A_{CP}$ in this mode are vital for the determination of the $CP$-violation parameter $\phi_2$ based on isospin relations in $B\to \pi \pi$ decays. The mode $B^0 \to \eta^0 K^{*}(892)^{0}$ is sensitive to a potentially large flavor-singlet contribution. Previous studies provided evidence for its existence at the $4\sigma$ level. The decay $B^+ \to \bar{K}^{*}(892)^{0} K^{*}(892)^{+}$ proceeds via the $b \to d$ loop diagram and is sensitive to potential new physics contributions. All three measurements employ the full $\Upsilon(4S)$ data set of $711{\rm fb}^{-1}$ available at Belle and will be our final results for these modes. Further increases in sensitivity will provided by the upcoming Belle II experiment.

Primary author

Prof. Youngjoon Kwon (Yonsei University)

Presentation Materials


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