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Phys Rev Lett. 2017 Mar 17;118(11):112001. doi: 10.1103/PhysRevLett.118.112001. Epub 2017 Mar 14.

Observation of Λ_{c}^{+}→nK_{S}^{0}π^{+}.

Physical review letters

M Ablikim, M N Achasov, S Ahmed, X C Ai, O Albayrak, M Albrecht, D J Ambrose, A Amoroso, F F An, Q An, J Z Bai, O Bakina, R Baldini Ferroli, Y Ban, D W Bennett, J V Bennett, N Berger, M Bertani, D Bettoni, J M Bian, F Bianchi, E Boger, I Boyko, R A Briere, H Cai, X Cai, O Cakir, A Calcaterra, G F Cao, S A Cetin, J F Chang, G Chelkov, G Chen, H S Chen, J C Chen, M L Chen, S Chen, S J Chen, X Chen, X R Chen, Y B Chen, X K Chu, G Cibinetto, H L Dai, J P Dai, A Dbeyssi, D Dedovich, Z Y Deng, A Denig, I Denysenko, M Destefanis, F De Mori, Y Ding, C Dong, J Dong, L Y Dong, M Y Dong, Z L Dou, S X Du, P F Duan, J Z Fan, J Fang, S S Fang, X Fang, Y Fang, R Farinelli, L Fava, F Feldbauer, G Felici, C Q Feng, E Fioravanti, M Fritsch, C D Fu, Q Gao, X L Gao, Y Gao, Z Gao, I Garzia, K Goetzen, L Gong, W X Gong, W Gradl, M Greco, M H Gu, Y T Gu, Y H Guan, A Q Guo, L B Guo, R P Guo, Y Guo, Y P Guo, Z Haddadi, A Hafner, S Han, X Q Hao, F A Harris, K L He, F H Heinsius, T Held, Y K Heng, T Holtmann, Z L Hou, C Hu, H M Hu, J F Hu, T Hu, Y Hu, G S Huang, J S Huang, X T Huang, X Z Huang, Z L Huang, T Hussain, W Ikegami Andersson, Q Ji, Q P Ji, X B Ji, X L Ji, L W Jiang, X S Jiang, X Y Jiang, J B Jiao, Z Jiao, D P Jin, S Jin, T Johansson, A Julin, N Kalantar-Nayestanaki, X L Kang, X S Kang, M Kavatsyuk, B C Ke, P Kiese, R Kliemt, B Kloss, O B Kolcu, B Kopf, M Kornicer, A Kupsc, W Kühn, J S Lange, M Lara, P Larin, L Lavezzi, H Leithoff, C Leng, C Li, Cheng Li, D M Li, F Li, F Y Li, G Li, H B Li, H J Li, J C Li, Jin Li, K Li, K Li, Lei Li, P R Li, Q Y Li, T Li, W D Li, W G Li, X L Li, X N Li, X Q Li, Y B Li, Z B Li, H Liang, Y F Liang, Y T Liang, G R Liao, D X Lin, B Liu, B J Liu, C X Liu, D Liu, F H Liu, Fang Liu, Feng Liu, H B Liu, H H Liu, H H Liu, H M Liu, J Liu, J B Liu, J P Liu, J Y Liu, K Liu, K Y Liu, L D Liu, P L Liu, Q Liu, Q J Liu, S B Liu, X Liu, Y B Liu, Y Y Liu, Z A Liu, Z Q Liu, H Loehner, X C Lou, H J Lu, J G Lu, Y Lu, Y P Lu, C L Luo, M X Luo, T Luo, X L Luo, X R Lyu, F C Ma, H L Ma, L L Ma, M M Ma, Q M Ma, T Ma, X N Ma, X Y Ma, Y M Ma, F E Maas, M Maggiora, Q A Malik, Y J Mao, Z P Mao, S Marcello, J G Messchendorp, G Mezzadri, J Min, T J Min, R E Mitchell, X H Mo, Y J Mo, C Morales Morales, N Yu Muchnoi, H Muramatsu, P Musiol, Y Nefedov, F Nerling, I B Nikolaev, Z Ning, S Nisar, S L Niu, X Y Niu, S L Olsen, Q Ouyang, S Pacetti, Y Pan, P Patteri, M Pelizaeus, H P Peng, K Peters, J Pettersson, J L Ping, R G Ping, R Poling, V Prasad, H R Qi, M Qi, S Qian, C F Qiao, L Q Qin, N Qin, X S Qin, Z H Qin, J F Qiu, K H Rashid, C F Redmer, M Ripka, G Rong, Ch Rosner, X D Ruan, A Sarantsev, M Savrié, C Schnier, K Schoenning, W Shan, M Shao, C P Shen, P X Shen, X Y Shen, H Y Sheng, W M Song, X Y Song, S Sosio, S Spataro, G X Sun, J F Sun, S S Sun, X H Sun, Y J Sun, Y Z Sun, Z J Sun, Z T Sun, C J Tang, X Tang, I Tapan, E H Thorndike, M Tiemens, I Uman, G S Varner, B Wang, B L Wang, D Wang, D Y Wang, K Wang, L L Wang, L S Wang, M Wang, P Wang, P L Wang, W Wang, W P Wang, X F Wang, Y Wang, Y D Wang, Y F Wang, Y Q Wang, Z Wang, Z G Wang, Z H Wang, Z Y Wang, T Weber, D H Wei, P Weidenkaff, S P Wen, U Wiedner, M Wolke, L H Wu, L J Wu, Z Wu, L Xia, L G Xia, Y Xia, D Xiao, H Xiao, Z J Xiao, Y G Xie, Yuehong Xie, Q L Xiu, G F Xu, J J Xu, L Xu, Q J Xu, Q N Xu, X P Xu, L Yan, W B Yan, W C Yan, Y H Yan, H J Yang, H X Yang, L Yang, Y X Yang, M Ye, M H Ye, J H Yin, Z Y You, B X Yu, C X Yu, J S Yu, C Z Yuan, Y Yuan, A Yuncu, A A Zafar, Y Zeng, Z Zeng, B X Zhang, B Y Zhang, C C Zhang, D H Zhang, H H Zhang, H Y Zhang, J Zhang, J J Zhang, J L Zhang, J Q Zhang, J W Zhang, J Y Zhang, J Z Zhang, K Zhang, L Zhang, S Q Zhang, X Y Zhang, Y Zhang, Y H Zhang, Y N Zhang, Y T Zhang, Yu Zhang, Z H Zhang, Z P Zhang, Z Y Zhang, G Zhao, J W Zhao, J Y Zhao, J Z Zhao, Lei Zhao, Ling Zhao, M G Zhao, Q Zhao, Q W Zhao, S J Zhao, T C Zhao, Y B Zhao, Z G Zhao, A Zhemchugov, B Zheng, J P Zheng, W J Zheng, Y H Zheng, B Zhong, L Zhou, X Zhou, X K Zhou, X R Zhou, X Y Zhou, K Zhu, K J Zhu, S Zhu, S H Zhu, X L Zhu, Y C Zhu, Y S Zhu, Z A Zhu, J Zhuang, L Zotti, B S Zou, J H Zou,

Affiliations

  1. Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  2. G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
  3. Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  4. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  5. Bochum Ruhr-University, D-44780 Bochum, Germany.
  6. University of Rochester, Rochester, New York 14627, USA.
  7. University of Turin, I-10125 Turin, Italy.
  8. INFN, I-10125 Turin, Italy.
  9. University of Science and Technology of China, Hefei 230026, People's Republic of China.
  10. Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  11. INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
  12. Peking University, Beijing 100871, People's Republic of China.
  13. Indiana University, Bloomington, Indiana 47405, USA.
  14. Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  15. INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
  16. University of Minnesota, Minneapolis, Minnesota 55455, USA.
  17. Wuhan University, Wuhan 430072, People's Republic of China.
  18. Ankara University, 06100 Tandogan, Ankara, Turkey.
  19. Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey.
  20. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
  21. Nanjing University, Nanjing 210093, People's Republic of China.
  22. Lanzhou University, Lanzhou 730000, People's Republic of China.
  23. Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
  24. Liaoning University, Shenyang 110036, People's Republic of China.
  25. Nankai University, Tianjin 300071, People's Republic of China.
  26. Zhengzhou University, Zhengzhou 450001, People's Republic of China.
  27. Tsinghua University, Beijing 100084, People's Republic of China.
  28. University of Ferrara, I-44122 Ferrara, Italy.
  29. University of Eastern Piedmont, I-15121, Alessandria, Italy.
  30. GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
  31. Guangxi University, Nanning 530004, People's Republic of China.
  32. Nanjing Normal University, Nanjing 210023, People's Republic of China.
  33. KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands.
  34. Henan Normal University, Xinxiang 453007, People's Republic of China.
  35. University of Hawaii, Honolulu, Hawaii 96822, USA.
  36. Shandong University, Jinan 250100, People's Republic of China.
  37. University of the Punjab, Lahore-54590, Pakistan.
  38. Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
  39. Huangshan College, Huangshan 245000, People's Republic of China.
  40. Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.
  41. Seoul National University, Seoul, 151-747 Korea.
  42. Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
  43. Beijing Institute of Petrochemical Technology, Beijing 102617, People's Republic of China.
  44. China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
  45. Beihang University, Beijing 100191, People's Republic of China.
  46. Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
  47. Sichuan University, Chengdu 610064, People's Republic of China.
  48. Guangxi Normal University, Guilin 541004, People's Republic of China.
  49. Shanxi University, Taiyuan 030006, People's Republic of China.
  50. Central China Normal University, Wuhan 430079, People's Republic of China.
  51. Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
  52. Zhejiang University, Hangzhou 310027, People's Republic of China.
  53. COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
  54. INFN and University of Perugia, I-06100 Perugia, Italy.
  55. Uludag University, 16059 Bursa, Turkey.
  56. Near East University, Nicosia, North Cyprus, Mersin 10, Turkey.
  57. Soochow University, Suzhou 215006, People's Republic of China.
  58. Hunan University, Changsha 410082, People's Republic of China.
  59. University of South China, Hengyang 421001, People's Republic of China.
  60. University of Science and Technology Liaoning, Anshan 114051, People's Republic of China.

PMID: 28368651 DOI: 10.1103/PhysRevLett.118.112001

Abstract

We report the first direct measurement of decays of the Λ_{c}^{+} baryon involving the neutron. The analysis is performed using 567  pb^{-1} of e^{+}e^{-} collision data collected at sqrt[s]=4.599  GeV with the BESIII detector at the BEPCII collider. We observe the decay Λ_{c}^{+}→nK_{S}^{0}π^{+} and measure the absolute branching fraction to be B(Λ_{c}^{+}→nK_{S}^{0}π^{+})=[1.82±0.23(stat)±0.11(syst)]%. A comparison to B[Λ_{c}^{+}→p(K[over ¯]π)^{0}] provides an important test of isospin symmetry and final state interactions.

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