Search for Λ+c → φpπ0 and branching fraction measurement of Λ+c → K-π+pπ0

Le résumé fourni par la source

We have searched for the Cabibbo-suppressed decay Λ þ c → ϕpπ 0 in e þ e -collisions using a data sample corresponding to an integrated luminosity of 915 fb -1 .The data were collected by the Belle experiment at the KEKB e þ e -asymmetric-energy collider running at or near the ϒð4SÞ and ϒð5SÞ resonances.No significant signal is observed, and we set an upper limit on the branching fraction of BðΛ þ c → ϕpπ 0 Þ < 15.3 × 10 -5 at 90% confidence level.The contribution of nonresonant Λ þ c → K þ K -pπ 0 decays is found to be consistent with zero, and the corresponding upper limit on its branching fraction is set to be BðΛ þ c → K þ K -pπ 0 Þ NR < 6.3 × 10 -5 at 90% confidence level.We also search for an intermediate hiddenstrangeness pentaquark decay P þ s → ϕp.We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of BðΛ þ c → P þ s π 0 Þ × BðP þ s → ϕpÞ < 8.3 × 10 -5 at

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