Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle, , ,
| Summary:
Using data samples of 988.4 fb$^-1$ and 427.9 fb$^-1$ collected with the
Belle and Belle II detectors, we present a study of the singly
Cabibbo-suppressed decays $Xi_c^0 to Lambda eta$, $Lambda eta’$, and
$Lambda pi^0$. We observe the decay $Xi_c^0 to Lambda eta$ and find
evidence for the decay $Xi_c^0 to Lambda eta’$, with corresponding
branching ratios determined to be $mathcalB(Xi_c^0 to Lambda
eta)/mathcalB(Xi_c^0 to Xi^- pi^+)= (4.16 pm 0.91 pm 0.23)%$
and $mathcalB(Xi_c^0 to Lambda eta’)/mathcalB(Xi_c^0 to Xi^-
pi^+)= (2.48 pm 0.82 pm 0.12)%$, respectively. We find no significant
signal in the $Xi_c^0 to Lambda pi^0$ decay mode and set an upper limit at
the 90% credibility level of $mathcalB(Xi_c^0 to Lambda
pi^0)/mathcalB(Xi_c^0 to Xi^- pi^+)< 3.5%$. Multiplying these
ratios by the world-average branching fraction of the normalization channel,
$mathcalB(Xi_c^0 to Xi^- pi^+)=(1.43 pm 0.27)%$, we obtain the
absolute branching fractions of $mathcalB(Xi_c^0 to Lambda eta)= (5.95
pm 1.30 pm 0.32 pm 1.13) times 10^-4$, $mathcalB(Xi_c^0 to Lambda
eta’)= (3.55 pm 1.17 pm 0.17 pm 0.68) times 10^-4$, and an upper limit
at the 90% credibility level on the absolute branching fraction of
$mathcalB(Xi_c^0 to Lambda pi^0)< 5.2 times 10^-4$. The quoted
first and second uncertainties are statistical and systematic, respectively,
while the third uncertainties arise from the branching fraction of the
normalization mode. These results are consistent with most theoretical
predictions and further the understanding of the underlying decay mechanisms.
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