Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle II Collaborations, :, F. Abudinén, L. Aggarwal
| Summary:
We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle
angle $ phi_{3} $ (also known as~$gamma$) using a model-independent Dalitz
plot analysis of linebreak $B^+to Dleft(K_{S}^{0}h^{+}h^{-}right)h^+$,
where $D$ is either a $D^0$ or $bar{D}{}^0$ meson and $h$ is either a $pi$ or
$K$. This is the first measurement that simultaneously uses Belle and Belle~II
data, combining samples corresponding to integrated luminosities of
SI{711}{fb^{-1}} and SI{128}{fb^{-1}}, respectively. All data were
accumulated from energy-asymmetric $e^+e^-$ collisions at a centre-of-mass
energy corresponding to the mass of the $Upsilon(4S)$ resonance. We measure
$phi_3 = left(78.4 pm 11.4 pm 0.5 pm 1.0 right)^{circ}$, where the first
uncertainty is statistical, the second is the experimental systematic
uncertainty and the third is from the uncertainties on external measurements of
the $D$-decay strong-phase parameters.
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