论文标题

搜索$ c \!p $违反和测量分支分数和衰减不对称参数的$λ_c^+\toλh^+$和$λ_c^+\toς^+x {0} h^+$($ h^+$($ h \!= \!= \!

Search for $C\!P$ violation and measurement of branching fractions and decay asymmetry parameters for $Λ_c^+\toΛh^+$ and $Λ_c^+\toΣ^{0} h^+$ ($h\!=\!K,\,π$)

论文作者

Belle Collaboration, Li, L. K., Shan, W., Kinoshita, K., Adachi, I., Aihara, H., Asner, D. M., Atmacan, H., Aushev, T., Babu, V., Bahinipati, S., Banerjee, Sw., Behera, P., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bobrov, A., Bodrov, D., Borah, J., Bračko, M., Branchini, P., Budano, A., Campajola, M., Červenkov, D., Chang, M. -C., Chang, P., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, H. E., Cho, K., Cho, S. -J., Choi, S. -K., Choi, Y., Choudhury, S., Cinabro, D., Dash, N., De Nardo, G., De Pietro, G., Dhamija, R., Di Capua, F., Doležal, Z., Dong, T. V., Epifanov, D., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Garmash, A., Giri, A., Goldenzweig, P., Gong, G., Graziani, E., Gu, T., Guan, Y., Gudkova, K., Hadjivasiliou, C., Hayasaka, K., Hayashii, H., Hedges, M. T., Hou, W. -S., Hsu, C. -L., Inami, K., Ishikawa, A., Itoh, R., Jacobs, W. W., Jang, E. -J., Ji, Q. P., Jia, S., Jin, Y., Joo, K. K., Kiesling, C., Kim, C. H., Kim, D. Y., Kim, K. -H., Kodyš, P., Konno, T., Korobov, A., Korpar, S., Kovalenko, E., Krokovny, P., Kuhr, T., Kumar, R., Kumara, K., Kuzmin, A., Kwon, Y. -J., Lai, Y. -T., Lam, T., Lange, J. S., Lee, S. C., Li, J., Li, S. X., Li, Y., Li, Y. B., Gioi, L. Li, Libby, J., Lieret, K., Masuda, M., Maurya, S. K., Merola, M., Metzner, F., Miyabayashi, K., Mizuk, R., Mussa, R., Nakao, M., Natkaniec, Z., Natochii, A., Nayak, L., Nayak, M., Niiyama, M., Nisar, N. K., Nishida, S., Ogawa, S., Ono, H., Oskin, P., Pakhlova, G., Pardi, S., Park, H., Park, S. -H., Passeri, A., Patra, S., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Podobnik, T., Prencipe, E., Prim, M. T., Rostomyan, A., Rout, N., Russo, G., Sahoo, D., Sakai, Y., Sandilya, S., Sangal, A., Savinov, V., Schnell, G., Schueler, J., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Sevior, M. E., Shapkin, M., Sharma, C., Shen, C. P., Shiu, J. -G., Singh, J. B., Sokolov, A., Solovieva, E., Starič, M., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Usov, Y., Vahsen, S. E., van Tonder, R., Varner, G., Vinokurova, A., Vossen, A., Waheed, E., Wang, E., Wang, X. L., Watanabe, M., Watanuki, S., Werbycka, O., Won, E., Xu, X., Yabsley, B. D., Yan, W., Yang, S. B., Yelton, J., Yin, J. H., Yook, Y., Yuan, C. Z., Zhang, Z. P., Zhilich, V., Zhukova, V.

论文摘要

我们报告了$λ_c^+\toλh^+$和$λ_c^+\toς^{0} h^+$($ h \!= \!= \! $ e^+e^ - $ collider。测量了两种cabbbo抑制的直接$ c \!p $不对称的结果(scs)诱人的bary子的衰变,$ a_ {c \!美元我们还对四种感兴趣模式的衰减不对称参数($α$)进行了最精确的测量,并通过$α$诱导的$ c \!p $ symmetry($ a_ {c \!p}^α$)搜索$ c \!p $违规。我们测量$ a_ {c \! 0.35 \ pm 0.14} $,这是第一个$ a_ {c \!p}^α$结果,用于Charmed Baryons的SCS衰变。我们在$λ_c^+\ to中搜索$λ$ -Hyperon $ c \!p $违规,to(λ,\,σ^0)π^+$,找到$ a_ {c \!这是Hyperon $ c \!P $违规第一次是通过Cabibbo最喜欢的魅力衰减来衡量的。找不到BARYON $ C \!P $违规的证据。我们还获得了两个SCS $λ_C^+$衰减的最精确的分支分数,$ \ MATHCAL {B}(λ_C^+\toλk^+)\!= \!(6.57 \ pm0.17 \ pm0.17 \ pm0.1111 \ pm0.11 \ pm0.35) $ \ MATHCAL {b}(λ_c^+\toς^0k^+)\!= \!(3.58 \ pm0.19 \ pm0.06 \ pm0.19)\ times10^{ - 4} $。第一个不确定性是统计的,是第二系统的,而第三个不确定性来自$λ_C^+\ to(λ,\,σ^0)π^+$的世界平均分支分支的不确定性。

We report a study of $Λ_c^+\toΛh^+$ and $Λ_c^+\toΣ^{0} h^+$ ($h\!=\!K,\,π$) decays based on a data sample of 980~${\rm fb}^{-1}$ collected with the Belle detector at the KEKB energy-asymmetric $e^+e^-$ collider. The first results of direct $C\!P$ asymmetry in two-body singly Cabibbo-suppressed (SCS) decays of charmed baryons are measured, $A_{C\!P}^{\rm{dir}}(Λ_c^+\toΛK^+)\!=\!+0.021\pm0.026\pm0.001$ and $A_{C\!P}^{\rm{dir}}(Λ_c^+\toΣ^0K^+)\!=\!+0.025\pm0.054\pm0.004$. We also make the most precise measurement of the decay asymmetry parameters ($α$) for the four modes of interest and search for $C\!P$ violation via the $α$-induced $C\!P$ asymmetry ($A_{C\!P}^α$). We measure $A_{C\!P}^α(Λ_c^+\toΛK^+)\!=\!{-0.023\pm0.086\pm0.071}$ and $A_{C\!P}^α(Λ_c^+\toΣ^0K^+)\!=\!{+0.08\pm 0.35\pm 0.14}$, which are the first $A_{C\!P}^α$ results for SCS decays of charmed baryons. We search for $Λ$-hyperon $C\!P$ violation in $Λ_c^+\to(Λ,\,Σ^0)π^+$ and find $A_{C\!P}^α(Λ\to pπ^{-})\!=\!{+0.013\pm0.007\pm0.011}$. This is the first time that hyperon $C\!P$ violation has been measured via Cabibbo-favored charm decays. No evidence of baryon $C\!P$ violation is found. We also obtain the most precise branching fractions for two SCS $Λ_c^+$ decays, $\mathcal{B}(Λ_c^+\toΛK^+)\!=\!(6.57\pm0.17\pm0.11\pm0.35)\times10^{-4}$ and $\mathcal{B}(Λ_c^+\toΣ^0K^+)\!=\!(3.58\pm0.19\pm0.06\pm0.19)\times10^{-4}$. The first uncertainties are statistical and the second systematic, while the third uncertainties come from the uncertainties on the world average branching fractions of $Λ_c^+\to(Λ,\,Σ^0)π^+$.

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