We have searched for the Cabibbo-suppressed decay Λ+c→ϕpπ0 in e+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+e− asymmetric-energy collider running at or near the Υ(4S) and Υ(5S)resonances. No significant signal is observed, and we set an upper limit on the branching fraction of B(Λ+c→ϕpπ0)<15.3×10−5 at 90% confidence level. The contribution of nonresonant Λ+c→K+K−pπ0 decays is found to be consistent with zero, and the corresponding upper limit on its branching fraction is set to be B(Λ+c→K+K−pπ0)NR<6.3×10−5 at 90% confidence level. We also search for an intermediate hidden-strangeness pentaquark decay P+s→ϕp. We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of B(Λ+c→P+sπ0)×B(P+s→ϕp)<8.3×10−5 at 90% confidence level. Finally, we measure the branching fraction for the Cabibbo-favored decay Λ+c→K−π+pπ0; the result is B(Λ+c→K−π+pπ0)=(4.42±0.05(stat)±0.12(syst)±0.16(norm))%, which is the most precise measurement to date.
Physical Review D
Digital Object Identifier (DOI)
et al., B. Pal; Joffe, D.; and Kulasiri, Ratnappuli L., "Search for Λ + c → ϕ p π 0 and branching fraction measurement of Λ + c → K − π + p π 0" (2017). Faculty Publications. 4199.