Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle II Collaborations, :, I. Adachi, J. K. Ahn
| Summary:
Using 983.0 $rm{fb}^{-1}$ and 427.9 $rm{fb}^{-1}$ data samples collected
with the Belle and Belle II detectors at the KEKB and SuperKEKB asymmetric
energy $e^+e^-$ colliders, respectively, we present studies of the
Cabibbo-favored $Xi_c^+$ decays ${Xi_{c}^{+}to Sigma^{+}K_{S}^{0}}$ and
$Xi_{c}^{+}to Xi^{0}pi^{+}$, and the singly Cabibbo-suppressed decay
$Xi_{c}^{+}to Xi^{0}K^{+}$. The ratios of branching fractions of
${Xi_{c}^{+}to Sigma^{+}K_{S}^{0}}$ and $Xi_{c}^{+}to Xi^{0}K^{+}$
relative to that of $Xi_{c}^{+}toXi^{-}pi^{+}pi^{+}$ are measured for the
first time, while the ratio ${cal B}(Xi_{c}^{+}toXi^{0}pi^{+})/{cal
B}(Xi_{c}^{+}toXi^{-}pi^{+}pi^{+}) $ is also determined and improved by an
order of magnitude in precision. The measured branching fraction ratios are
$frac{cal{B}(Xi_{c}^{+} to Sigma^{+}K_{S}^{0})}{cal{B}(Xi_{c}^{+}to
Xi^{-}pi^{+}pi^+)}= 0.067 pm 0.007 pm 0.003$, $frac{cal{B}(Xi_c^{+} to
Xi^{0}pi^{+})}{cal{B}(Xi_{c}^{+}to Xi^{-}pi^{+}pi^+)} = 0.248 pm 0.005
pm 0.009$, $frac{cal{B}(Xi_c^{+} to Xi^{0}K^{+})}{cal{B}(Xi_{c}^{+}to
Xi^{-}pi^{+}pi^+)} = 0.017 pm 0.003 pm 0.001$. Additionally, the ratio
${cal B}(Xi_{c}^{+}toXi^{0}K^{+})/{cal B}(Xi_{c}^{+}toXi^{0}pi^{+})$
is measured to be $ 0.068 pm 0.010 pm 0.004$. Here, the first and second
uncertainties are statistical and systematic, respectively. Multiplying the
ratios by the branching fraction of the normalization mode, ${mathcal
B}(Xi_{c}^{+}toXi^{-}pi^{+}pi^+)= (2.9pm 1.3)%$, we obtain the following
absolute branching fractions ${cal B}(Xi_{c}^{+}toSigma^{+}K^{0}_{S}) =
(0.194 pm 0.021 pm 0.009 pm 0.087 )%$, ${cal
B}(Xi_{c}^{+}toXi^{0}pi^{+}) = (0.719 pm 0.014 pm 0.024 pm 0.322 )%$,
${cal B}(Xi_{c}^{+}toXi^{0}K^{+}) = (0.049 pm 0.007 pm 0.002 pm 0.022
)%$.
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