Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle, , ,
| Summary:
We present a measurement of the time-dependent $CP$ asymmetry in $B^0 to
K_rm S^0 : pi^+ pi^- gamma$ decays using a data set of 365 fb$^-1$
recorded by the Belle II experiment and the final data set of 711 fb$^-1$
recorded by the Belle experiment at the $rm Upsilon(4S)$ resonance. The
direct and mixing-induced time-dependent $CP$ violation parameters $C$ and $S$
are determined along with two additional quantities, $S^+$ and $S^-$,
defined in the two halves of the $m^2(K_rm S^0 pi^+)-m^2(K_rm S^0
pi^-)$ plane. The measured values are $C = -0.17 pm 0.09 pm 0.04$, $S =
-0.29 pm 0.11 pm 0.05$, $S^+ = -0.57 pm 0.23 pm 0.10$ and $S^- = 0.31
pm 0.24 pm 0.05$, where the first uncertainty is statistical and the second
systematic.
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