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Measurement of branching fractions of $Lambda_{c}^{+} rightarrow etaLambdapi^{+}$ , $eta Sigma^{0} pi^{+}$ , $Lambda(1670) pi^{+}$ , and $eta Sigma(1385)^{+}$

Lee, J. Y.*; 谷田聖; Belle Collaboration*; 他201名*

Physical Review D, 103(5), p.052005_1 - 052005_12, 2021/03

AA2022-0017.pdf:0.63MB

https://doi.org/10.1103/PhysRevD.103.052005

被引用回数：16 パーセンタイル：62.88(Astronomy & Astrophysics)

We report branching fraction measurements of four decay modes of the $Lambda_{c}^{+}$ baryon, each of which includes an meson and a baryon in the final state, and all of which are measured relative to the $Lambda_{c}^{+} rightarrow p K^{-} pi^{+}$ decay mode. The results are based on a $980~mathrm{fb^{-1}}$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Two decays, $eta Sigma^{0} pi^{+}$ and $Lambda(1670) pi^{+}$ , are observed for the first time, while the measurements of the other decay modes, $Lambda_{c}^{+} rightarrow etaLambdapi^{+}$ and $etaSigma(1385)^{+}$ , are more precise than those made previously. We obtain $mathcal{B}(Lambda_{c}^{+} rightarrow eta Lambda pi^{+})$ / $mathcal{B}(Lambda_{c}^{+} rightarrow p K^{-} pi^{+})$ = , $mathcal{B}(Lambda_{c}^{+} rightarrow eta Sigma^{0} pi^{+})$ / $mathcal{B}(Lambda_{c}^{+} rightarrow p K^{-} pi^{+})$ = , $mathcal{B}(Lambda_{c}^{+} rightarrow Lambda(1670) pi^{+}) times mathcal{B}(Lambda(1670) rightarrow etaLambda)$ / $mathcal{B}(Lambda_{c}^{+} rightarrow p K^{-} pi^{+})$ = $(5.54 pm 0.29 pm 0.73) times 10^{-2}$ , and $mathcal{B}(Lambda_{c}^{+} rightarrow eta Sigma(1385)^{+})$ / $mathcal{B}(Lambda_{c}^{+} rightarrow p K^{-}pi^{+})$ = . The mass and width of the are also precisely determined to be $1674.3 pm 0.8 pm 4.9~{rm MeV}/c^{2}$ and , respectively, where the uncertainties are statistical and systematic, respectively.