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  • Measurements of weak decay asymmetries of Λ+c → pK0s, Λπ+, Σ+ π0, and Σ0π+

    • 摘要:

      Using e+e- → Λ+cΛ-c production from a 567 pb-1 data sample collected by BESIII at 4.6 GeV, a full angular analysis is carried out simultaneously on the four decay modes of Λ+c → pK0S, Λπ+, Σ+π0, and Σ0π+. For the first time, the Λ+c transverse polarization is studied in unpolarized e+e- collisions, where a nonzero effect is observed with a statistical significance of 2.1σ. The decay asymmetry parameters of the Λ+c weak hadronic decays into pK0S, Λπ+, Σ+π0 and Σ0π+ are measured to be 0.18 ± 0.43(stat) ± 0.14(syst), -0.80 ± 0.11(stat) ± 0.02(syst), -0.57 ± 0.10(stat) ± 0.07(syst), and -0.73 ± 0.17(stat) ± 0.07(syst), respectively. In comparison with previous results, the measurements for the Λπ+ and Σ+π0 modes are consistent but with improved precision, while the parameters for the pK0S and Σ0π+ modes are measured for the first time.

    • 作者:

      M. Ablikim;M. N. Achasov;P. Adlarson;S. Ahmed;M. Albrecht;M. Alekseev;A. Amoroso;F. F. An;琪 安;Y. Bai;O. Bakina;R. Baldini Ferroli;Y. Ban;K. Begzsuren;J. V. Bennett;N. Berger;M. Bertani;D. Bettoni;F. Bianchi;J. Biernat;J. Bloms;I. Boyko;R. A. Briere;H. Cai;X. Cai;A. Calcaterra;G. F. Cao;燎原 董;双世 房;立波 郭;性涛 黄;钢 李;海波 李;卫东 李;晓磊 李;前 刘;翔 刘;加伦 平;建国 陈;肖雁 沈;洁琬 孙;昌建 唐;贻芳 王;振军 肖;铭汉 叶;长征 苑;宏浩 张;尧 张;政国 赵;阳恒 郑

    • 刊名:

      Physical Review D

    • 在线出版时间:

      2019-10-14