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  • Measurement of Singly Cabibbo Suppressed Decays Λ_{c}^{+}→pπ^{+}π^{-} and Λ_{c}^{+}→pK^{+}K^{-}
    An, Q; Bennett, J V; Bianchi, F; Briere, R A; Cetin, S A; Chen, J C; Cheng, H P; Denig, A; Du, S X; Fang, S S; Farinelli, R; Felici, G; Gao, X L; Gao, Y; Garzia, I; Gu, Y T; Heng, Y K; Hu, C; Hu, T; Ji, Q; Jiang, L W; Jin, S; Kliemt, R; Kloss, B; Kolcu, O B; Kopf, B; Kühn, W; Li, G; Li, J C; Li, K; Li, P L; Li, Q Y; Li, W D; Li, W G; Li, X L; Li, Y B; Liu, B; Liu, C X; Liu, K Y; Liu, P L; Liu, Y B; Liu, Y Y; Loehner, H; Long, Y F; Lu, Y; Ma, L L; Ma, M M; Ma, X N; Messchendorp, J G; Min, J; Mo, X H; Nefedov, Y; Pan, Y; Patteri, P; Prasad, V; Qi, H R; Qiu, J F; Redmer, C F; Ripka, M; Sarantsev, A; Savrié, M; Schnier, C; Schoenning, K; Shen, P X; Shen, X Y; Spataro, S; Sun, X H; Sun, Y J; Uman, I; Varner, G S; Wang, D; Wang, L S; Wang, M; Wang, Y Q; Weidenkaff, P; Wu, L H; Xia, Y; Xiao, Z J; Xie, Y G; Xu, J J; Xu, X P; Yang, H J; Yang, L; Ye, M H; Zeng, Y; Zhang, B Y; Zhang, J; Zhang, J Y; Zhang, J Z; Zhang, K; Zhang, S Q; Zhang, X Y; Zhang, Y N; Zhao, M G; Zhao, Q; Zhao, Q W; Zhao, Z G; Zhou, X R; Zhu, K J; Zhuang, J

    Physical review letters, 2016-Dec-02, 20161202, Letnik: 117, Številka: 23
    Journal Article

    Using 567  pb^{-1} of data collected with the BESIII detector at a center-of-mass energy of sqrts=4.599  GeV, near the Λ_{c}^{+}Λover ¯_{c}^{-} threshold, we study the singly Cabibbo-suppressed decays Λ_{c}^{+}→pπ^{+}π^{-} and Λ_{c}^{+}→pK^{+}K^{-}. By normalizing with respect to the Cabibbo-favored decay Λ_{c}^{+}→pK^{-}π^{+}, we obtain ratios of branching fractions: B(Λ_{c}^{+}→pπ^{+}π^{-})/B(Λ_{c}^{+}→pK^{-}π^{+})=(6.70±0.48±0.25)%, B(Λ_{c}^{+}→pϕ)/B(Λ_{c}^{+}→pK^{-}π^{+})=(1.81±0.33±0.13)%, and B(Λ_{c}^{+}→pK^{+}K_{non-ϕ}^{-})/B(Λ_{c}^{+}→pK^{-}π^{+})=(9.36±2.22±0.71)×10^{-3}, where the uncertainties are statistical and systematic, respectively. The absolute branching fractions are also presented. Among these measurements, the decay Λ_{c}^{+}→pπ^{+}π^{-} is observed for the first time, and the precision of the branching fraction for Λ_{c}^{+}→pK^{+}K_{non-ϕ}^{-} and Λ_{c}^{+}→pϕ is significantly improved.

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