Singly Cabibbo-suppressed hadronic decays of Λc+

We study singly Cabibbo-suppressed two-body hadronic decays of the charmed baryon Lambda(+)(c,)nameley, Lambda(+)(c) -> Lambda K+, p pi(0), p eta, n pi(+), sigma K-0(+),Sigma K-+(0). We use the measured rate of Lambda(+)(c) -> p phi to fix the effective Wilson coefficient a(2) for naive color-suppressed modes and the effective number of color N-c(eff). We rely on the current-algebra approach to evaluate W-exchange and nonfactorizable internal W-emission amplitudes, that is, the commutator terms for the S wave and the pole terms for the P wave. Our prediction for Lambda(c)+ -> p eta is in excellent agreement with the BESIII measurement. The p eta (p eta(0)) mode has large (small) rate because of a large constructive (destructive) interference between the factorizable and nonfactorizable amplitudes for both S and P waves. Some of the SU(3) relations such as M(Lambda(+)(c) -> n pi(+)) = root 2M(Lambda(+)(c) -> p pi(0)) derived under the assumption of sextet dominance are not valid for decays with factorizable terms. Our calculation indicates that the branching fraction of Lambda(+)(c) -> n pi(+) is about 3.5 times larger than that of Lambda(+)(c) -> p pi(0). Decay asymmetries are found to be negative for all singly Cabibbo-suppressed modes and range from -0.56 to -0.96.