Investigation of the ΔI=1/2 Rule and Test of CP Symmetry through the Measurement of Decay Asymmetry Parameters in Ξ^{-} Decays.
M Ablikim, M N Achasov, P Adlarson, X C Ai, R Aliberti, A Amoroso, M R An, Q An, Y Bai, O Bakina, I Balossino, Y Ban, V Batozskaya, K Begzsuren, N Berger, M Berlowski, M Bertani, D Bettoni, F Bianchi, E Bianco, A Bortone, I Boyko, R A Briere, A Brueggemann, H Cai, X Cai, A Calcaterra, G F Cao, N Cao, S A Cetin, J F Chang, T T Chang, W L Chang, G R Che, G Chelkov, C Chen, Chao Chen, G Chen, H S Chen, M L Chen, S J Chen, S L Chen, S M Chen, T Chen, X R Chen, X T Chen, Y B Chen, Y Q Chen, Z J Chen, W S Cheng, S K Choi, X Chu, G Cibinetto, S C Coen, F Cossio, J J Cui, H L Dai, J P Dai, A Dbeyssi, R E de Boer, D Dedovich, Z Y Deng, A Denig, I Denysenko, M Destefanis, F De Mori, B Ding, X X Ding, Y Ding, Y Ding, J Dong, L Y Dong, M Y Dong, X Dong, M C Du, S X Du, Z H Duan, P Egorov, Y H Fan, J Fang, S S Fang, W X Fang, Y Fang, R Farinelli, L Fava, F Feldbauer, G Felici, C Q Feng, J H Feng, K Fischer, M Fritsch, C D Fu, J L Fu, Y W Fu, H Gao, Y N Gao, Yang Gao, S Garbolino, I Garzia, P T Ge, Z W Ge, C Geng, E M Gersabeck, A Gilman, K Goetzen, L Gong, W X Gong, W Gradl, S Gramigna, M Greco, M H Gu, Y T Gu, C Y Guan, Z L Guan, A Q Guo, L B Guo, M J Guo, R P Guo, Y P Guo, A Guskov, T T Han, W Y Han, X Q Hao, F A Harris, K K He, K L He, F H H Heinsius, C H Heinz, Y K Heng, C Herold, T Holtmann, P C Hong, G Y Hou, X T Hou, Y R Hou, Z L Hou, H M Hu, J F Hu, T Hu, Y Hu, G S Huang, K X Huang, L Q Huang, X T Huang, Y P Huang, T Hussain, N Hüsken, N In der Wiesche, M Irshad, J Jackson, S Jaeger, S Janchiv, J H Jeong, Q Ji, Q P Ji, X B Ji, X L Ji, Y Y Ji, X Q Jia, Z K Jia, H J Jiang, P C Jiang, S S Jiang, T J Jiang, X S Jiang, Y Jiang, J B Jiao, Z Jiao, S Jin, Y Jin, M Q Jing, T Johansson, X K, S Kabana, N Kalantar-Nayestanaki, X L Kang, X S Kang, M Kavatsyuk, B C Ke, A Khoukaz, R Kiuchi, R Kliemt, O B Kolcu, B Kopf, M Kuessner, A Kupsc, W Kühn, J J Lane, P Larin, A Lavania, L Lavezzi, T T Lei, Z H Lei, H Leithoff, M Lellmann, T Lenz, C Li, C Li, C H Li, Cheng Li, D M Li, F Li, G Li, H Li, H B Li, H J Li, H N Li, Hui Li, J R Li, J S Li, J W Li, K L Li, Ke Li, L J Li, L K Li, Lei Li, M H Li, P R Li, Q X Li, S X Li, T Li, W D Li, W G Li, X H Li, X L Li, Xiaoyu Li, Y G Li, Z J Li, Z X Li, C Liang, H Liang, H Liang, H Liang, Y F Liang, Y T Liang, G R Liao, L Z Liao, Y P Liao, J Libby, A Limphirat, D X Lin, T Lin, B J Liu, B X Liu, C Liu, C X Liu, F H Liu, Fang Liu, Feng Liu, G M Liu, H Liu, H B Liu, H M Liu, Huanhuan Liu, Huihui Liu, J B Liu, J L Liu, J Y Liu, K Liu, K Y Liu, Ke Liu, L Liu, L C Liu, Lu Liu, M H Liu, P L Liu, Q Liu, S B Liu, T Liu, W K Liu, W M Liu, X Liu, Y Liu, Y Liu, Y B Liu, Z A Liu, Z Q Liu, X C Lou, F X Lu, H J Lu, J G Lu, X L Lu, Y Lu, Y P Lu, Z H Lu, C L Luo, M X Luo, T Luo, X L Luo, X R Lyu, Y F Lyu, F C Ma, H L Ma, J L Ma, L L Ma, M M Ma, Q M Ma, R Q Ma, R T Ma, X Y Ma, Y Ma, Y M Ma, F E Maas, M Maggiora, S Malde, Q A Malik, A Mangoni, Y J Mao, Z P Mao, S Marcello, Z X Meng, J G Messchendorp, G Mezzadri, H Miao, T J Min, R E Mitchell, X H Mo, N Yu Muchnoi, J Muskalla, Y Nefedov, F Nerling, I B Nikolaev, Z Ning, S Nisar, Q L Niu, W D Niu, Y Niu, S L Olsen, Q Ouyang, S Pacetti, X Pan, Y Pan, A Pathak, P Patteri, Y P Pei, M Pelizaeus, H P Peng, Y Y Peng, K Peters, J L Ping, R G Ping, S Plura, V Prasad, F Z Qi, H Qi, H R Qi, M Qi, T Y Qi, S Qian, W B Qian, C F Qiao, J J Qin, L Q Qin, X P Qin, X S Qin, Z H Qin, J F Qiu, S Q Qu, C F Redmer, K J Ren, A Rivetti, M Rolo, G Rong, Ch Rosner, S N Ruan, N Salone, A Sarantsev, Y Schelhaas, K Schoenning, M Scodeggio, K Y Shan, W Shan, X Y Shan, J F Shangguan, L G Shao, M Shao, C P Shen, H F Shen, W H Shen, X Y Shen, B A Shi, H C Shi, J L Shi, J Y Shi, Q Q Shi, R S Shi, X Shi, J J Song, T Z Song, W M Song, Y J Song, Y X Song, S Sosio, S Spataro, F Stieler, Y J Su, G B Sun, G X Sun, H Sun, H K Sun, J F Sun, K Sun, L Sun, S S Sun, T Sun, W Y Sun, Y Sun, Y J Sun, Y Z Sun, Z T Sun, Y X Tan, C J Tang, G Y Tang, J Tang, Y A Tang, L Y Tao, Q T Tao, M Tat, J X Teng, V Thoren, W H Tian, W H Tian, Y Tian, Z F Tian, I Uman, S J Wang, B Wang, B L Wang, Bo Wang, C W Wang, D Y Wang, F Wang, H J Wang, H P Wang, J P Wang, K Wang, L L Wang, M Wang, Meng Wang, S Wang, S Wang, T Wang, T J Wang, W Wang, W Wang, W P Wang, X Wang, X F Wang, X J Wang, X L Wang, Y Wang, Y D Wang, Y F Wang, Y H Wang, Y N Wang, Y Q Wang, Yaqian Wang, Yi Wang, Z Wang, Z L Wang, Z Y Wang, Ziyi Wang, D Wei, D H Wei, F Weidner, S P Wen, C W Wenzel, U Wiedner, G Wilkinson, M Wolke, L Wollenberg, C Wu, J F Wu, L H Wu, L J Wu, X Wu, X H Wu, Y Wu, Y H Wu, Y J Wu, Z Wu, L Xia, X M Xian, T Xiang, D Xiao, G Y Xiao, S Y Xiao, Y L Xiao, Z J Xiao, C Xie, X H Xie, Y Xie, Y G Xie, Y H Xie, Z P Xie, T Y Xing, C F Xu, C J Xu, G F Xu, H Y Xu, Q J Xu, Q N Xu, W Xu, W L Xu, X P Xu, Y C Xu, Z P Xu, Z S Xu, F Yan, L Yan, W B Yan, W C Yan, X Q Yan, H J Yang, H L Yang, H X Yang, Tao Yang, Y Yang, Y F Yang, Y X Yang, Yifan Yang, Z W Yang, Z P Yao, M Ye, M H Ye, J H Yin, Z Y You, B X Yu, C X Yu, G Yu, J S Yu, T Yu, X D Yu, C Z Yuan, L Yuan, S C Yuan, X Q Yuan, Y Yuan, Z Y Yuan, C X Yue, A A Zafar, F R Zeng, X Zeng, Y Zeng, Y J Zeng, X Y Zhai, Y C Zhai, Y H Zhan, A Q Zhang, B L Zhang, B X Zhang, D H Zhang, G Y Zhang, H Zhang, H C Zhang, H H Zhang, H H Zhang, H Q Zhang, H Y Zhang, J Zhang, J J Zhang, J L Zhang, J Q Zhang, J W Zhang, J X Zhang, J Y Zhang, J Z Zhang, Jianyu Zhang, Jiawei Zhang, L M Zhang, L Q Zhang, Lei Zhang, P Zhang, Q Y Zhang, Shuihan Zhang, Shulei Zhang, X D Zhang, X M Zhang, X Y Zhang, Xuyan Zhang, Y Zhang, Y Zhang, Y T Zhang, Y H Zhang, Yan Zhang, Yao Zhang, Z H Zhang, Z L Zhang, Z Y Zhang, Z Y Zhang, G Zhao, J Zhao, J Y Zhao, J Z Zhao, Lei Zhao, Ling Zhao, M G Zhao, S J Zhao, Y B Zhao, Y X Zhao, Z G Zhao, A Zhemchugov, B Zheng, J P Zheng, W J Zheng, Y H Zheng, B Zhong, X Zhong, H Zhou, L P Zhou, X Zhou, X K Zhou, X R Zhou, X Y Zhou, Y Z Zhou, J Zhu, K Zhu, K J Zhu, L Zhu, L X Zhu, S H Zhu, S Q Zhu, T J Zhu, W J Zhu, Y C Zhu, Z A Zhu, J H Zou, J ZuUsing (10087±44)×10^{6} J/ψ events collected with the BESIII detector, numerous Ξ^{-} and Λ decay asymmetry parameters are simultaneously determined from the process J/ψ→Ξ^{-}Ξ[over ¯]^{+}→Λ(pπ^{-})π^{-}Λ[over ¯](n[over ¯]π^{0})π^{+} and its charge-conjugate channel. The precisions of α_{Λ0} for Λ→nπ^{0} and α[over ¯]_{Λ0} for Λ[over ¯]→n[over ¯]π^{0} compared to world averages are improved by factors of 4 and 1.7, respectively. The ratio of decay asymmetry parameters of Λ→nπ^{0} to that of Λ→pπ^{-}, ⟨α_{Λ0}⟩/⟨α_{Λ-}⟩, is determined to be 0.873±0.012_{-0.010}^{+0.011}, where the first and the second uncertainties are statistical and systematic, respectively. The ratio is smaller than unity more than 5σ, which signifies the existence of the ΔI=3/2 transition in Λ for the first time. Besides, we test for CP symmetry in Ξ^{-}→Λπ^{-} and in Λ→nπ^{0} with the best precision to date.
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices 
