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Evidence for the singly-Cabibbo-suppressed decay Λ_(c)⁺ to pη and search for Λ_(c)⁺ to pπ⁰
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arxiv 1702.05279 v3 pith:BXWPXCUP submitted 2017-02-17 hep-ex
Evidence for the singly-Cabibbo-suppressed decay Λ_(c)⁺ to pη and search for Λ_(c)⁺ to pπ⁰
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We study the singly-Cabibbo-suppressed decays $\Lambda_c^{+}\to p\eta$ and $\Lambda_{c}^{+}\to p\pi^{0}$ using $\Lambda_{c}^{+}\Lambda_{c}^{+}$ pairs produced by $e^+e^-$ collisions at a center-of-mass energy of $\sqrt{s} = 4.6\; GeV$. The data sample was collected by the BESIII detector at the BEPCII collider and corresponds to an integrated luminosity of 567 $pb^{-1}$. We find the first evidence for the decay $\Lambda_{c}^{+}\to p \eta$ with a statistical significance of $4.2\sigma$ and measure its branching fraction to be $\mathcal{B}(\Lambda_c^+\to p\eta)= (1.24\pm0.28({\rm{stat.}})\pm0.10({\rm{syst.}}))\times10^{-3}$. No significant $\Lambda_c^+ \to p\pi^0$ signal is observed. We set an upper limit on its branching fraction $\mathcal{B}(\Lambda_c^+ \to p\pi^{0}) < 2.7 \times 10^{-4}$ at the 90% confidence level.
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