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Measurements of the branching fractions of $$Lambda_c^+ to p eta$$ and $$Lambda_c^+ to p pi^0$$ decays at Belle

Li, S. X.*; Tanida, Kiyoshi   ; Belle Collaboration*; 203 of others*

We report measurements of the branching fractions of singly Cabibbo-suppressed decays $$Lambda_c^+ to p eta$$ and $$Lambda_c^+ to p pi^0$$ using the full Belle data sample corresponding to an integrated luminosity of 980.6 $$rm fb^{-1}$$. The data were collected by the Belle detector at the KEKB $$e^{+}$$$$e^{-}$$ asymmetric-energy collider. A clear $$Lambda_c^+$$ signal is seen in the invariant mass distribution of $$p eta$$. The signal yield of the $$Lambda_c^+ to p eta$$ process is $$7734 pm 263$$; from this, we measure the ratio of branching fractions $${cal B}(Lambda_c^+ to p eta)/{cal B}(Lambda_c^+ to p K^- pi^+) = (2.258 pm 0. 077(rm stat.) pm 0.136(rm syst.))times 10^{-2}$$, from which we infer the branching fraction $${cal B}(Lambda_c^+ to p eta) = (1.42 pm 0.05(rm stat.) pm 0.11(rm syst.)) times 10^{-3}$$. In addition, no significant signal for $$Lambda_c^+ to p pi^0$$ is found so an upper limit on the branching fraction of $${cal B}(Lambda_c^+ to p pi^0) < 8.0 times 10^{-5}$$ at 90% credibility level is set, more than three times better than the best current upper limit.

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