Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, Belle II Collaboration, , ,
| Summary:
We report decay-rate $CP$ asymmetries of the singly-Cabibbo-suppressed decays
$Xi_c^+toSigma^+h^+h^-$ and $Lambda_c^+to ph^+h^-$, with $h=K,pi$,
measured using 428 fb$^-1$ of $e^+e^-$ collisions collected by the Belle II
experiment at the SuperKEKB collider. The results, beginequation
A_CP(Xi_c^+toSigma^+K^+K^-) = (3.7pm6.6pm0.6)%, endequation
beginequation
A_CP(Xi_c^+toSigma^+pi^+pi^-) = (9.5pm6.8pm0.5)%, endequation
beginequation
A_CP(Lambda_c^+to pK^+K^-) = (3.9pm1.7pm0.7)%, endequation
beginequation
A_CP(Lambda_c^+to ppi^+pi^-) = (0.3pm1.0pm0.2)%, endequation
where the first uncertainties are statistical and the second systematic, agree
with $CP$ symmetry. From these results we derive the sums beginequation
A_CP(Xi_c^+toSigma^+pi^+pi^-) , + , A_CP(Lambda_c^+to pK^+K^-) =
(13.4 pm 7.0pm 0.9)%, endequation beginequation
A_CP(Xi_c^+toSigma^+K^+K^-) , + , A_CP(Lambda_c^+to ppi^+pi^-) =
(phantom04.0 pm 6.6pm 0.7)%, endequation which are consistent with the
$U$-spin symmetry prediction of zero. These are the first measurements of $CP$
asymmetries for individual hadronic three-body charmed-baryon decays.
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