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Ablikim M, Achasov MN, Ai XC, et al. Observation of η'→π+ π π+ π- and η'→π+π- π0 π0. Phys Rev Lett. 2014;112(25):251801doi: 10.1103/PhysRevLett.112.251801.
Ablikim, M., Achasov, M. N., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J., An, F. F., An, Q., Bai, J. Z., Baldini Ferroli, R., Ban, Y., Bennett, J. V., Bertani, M., Bian, J. M., Boger, E., Bondarenko, O., Boyko, I., Braun, S., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, S. J., Chen, X., Chen, X. R., Chen, Y. B., Cheng, H. P., Chu, X. K., Chu, Y. P., Cronin-Hennessy, D., Dai, H. L., Dai, J. P., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., Ding, W. M., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Du, S. X., Fan, J. Z., Fang, J., Fang, S. S., Fang, Y., Fava, L., Feng, C. Q., Fu, C. D., Fuks, O., Gao, Q., Gao, Y., Geng, C., Goetzen, K., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, Y. T., Guan, Y. H., Guo, A. Q., Guo, L. B., Guo, T., Guo, Y. P., Han, Y. L., Harris, F. A., He, K. L., He, M., He, Z. Y., Held, T., Heng, Y. K., Hou, Z. L., Hu, C., Hu, H. M., Hu, J. F., Hu, T., Huang, G. M., Huang, G. S., Huang, H. P., Huang, J. S., Huang, L., Huang, X. T., Huang, Y., Hussain, T., Ji, C. S., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, L. L., Jiang, L. W., Jiang, X. S., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Johansson, T., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Kloss, B., Kopf, B., Kornicer, M., Kuehn, W., Kupsc, A., Lai, W., Lange, J. S., Lara, M., Larin, P., Leyhe, M., Li, C. H., Li, C., Li, C., Li, D., Li, D. M., Li, F., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, K., Li, K., Li, L., Li, P. R., Li, Q. J., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Lin, D. X., Liu, B. J., Liu, C. L., Liu, C. X., Liu, F. H., Liu, F., Liu, F., Liu, H. B., Liu, H. H., Liu, H. M., Liu, J., Liu, J. P., Liu, K., Liu, K. Y., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Z. A., Liu, Z., Liu, Z., Loehner, H., Lou, X. C., Lu, G. R., Lu, H. J., Lu, H. L., Lu, J. G., Lu, X. R., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, T., Luo, X. L., Lv, M., Ma, F. C., Ma, H. L., Ma, Q. M., Ma, S., Ma, T., Ma, X. Y., Maas, F. E., Maggiora, M., Malik, Q. A., Mao, Y. J., Mao, Z. P., Messchendorp, J. G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Moeini, H., Morales Morales, C., Moriya, K., Muchnoi, N. Y., Muramatsu, H., Nefedov, Y., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pelizaeus, M., Peng, H. P., Peters, K., Ping, J. L., Ping, R. G., Poling, R., Q, N., Qi, M., Qian, S., Qiao, C. F., Qin, L. Q., Qin, X. S., Qin, Y., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Ripka, M., Rong, G., Ruan, X. D., Sarantsev, A., Schoenning, K., Schumann, S., Shan, W., Shao, M., Shen, C. P., Shen, X. Y., Sheng, H. Y., Shepherd, M. R., Song, W. M., Song, X. Y., Spataro, S., Spruck, B., Sun, G. X., Sun, J. F., Sun, S. S., Sun, Y. J., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, X., Tapan, I., Thorndike, E. H., Toth, D., Ullrich, M., Uman, I., Varner, G. S., Wang, B., Wang, D., Wang, D. Y., Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, Q. J., Wang, S. G., Wang, W., Wang, X. F., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Wei, D. H., Wei, J. B., Weidenkaff, P., Wen, S. P., Werner, M., Wiedner, U., Wolke, M., Wu, L. H., Wu, N., Wu, Z., Xia, L. G., Xia, Y., Xiao, D., Xiao, Z. J., Xie, Y. G., Xiu, Q. L., Xu, G. F., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Xue, Z., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. X., Yang, L., Yang, Y., Yang, Y. X., Ye, H., Ye, M., Ye, M. H., Yu, B. X., Yu, C. X., Yu, H. W., Yu, J. S., Yu, S. P., Yuan, C. Z., Yuan, W. L., Yuan, Y., Zafar, A. A., Zallo, A., Zang, S. L., Zeng, Y., Zhang, B. X., Zhang, B. Y., Zhang, C., Zhang, C. B., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J. J., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, S. H., Zhang, X. J., Zhang, X. Y., Zhang, Y., Zhang, Y. H., Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, L., Zhao, L., Zhao, M. G., Zhao, Q., Zhao, Q. W., Zhao, S. J., Zhao, T. C., Zhao, X. H., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhu, K., Zhu, K. J., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zou, B. S., & Zou, J. H. (2014). Observation of η'→π+ π π+ π- and η'→π+π- π0 π0. Physical review letters, 112(25), 251801. https://doi.org/10.1103/PhysRevLett.112.251801
Ablikim, M, et al. "Observation of η'→π+ π π+ π- and η'→π+π- π0 π0." Physical review letters vol. 112,25 (2014): 251801. doi: https://doi.org/10.1103/PhysRevLett.112.251801
Ablikim M, Achasov MN, Ai XC, Albayrak O, Albrecht M, Ambrose DJ, An FF, An Q, Bai JZ, Baldini Ferroli R, Ban Y, Bennett JV, Bertani M, Bian JM, Boger E, Bondarenko O, Boyko I, Braun S, Briere RA, Cai H, Cai X, Cakir O, Calcaterra A, Cao GF, Cetin SA, Chang JF, Chelkov G, Chen G, Chen HS, Chen JC, Chen ML, Chen SJ, Chen X, Chen XR, Chen YB, Cheng HP, Chu XK, Chu YP, Cronin-Hennessy D, Dai HL, Dai JP, Dedovich D, Deng ZY, Denig A, Denysenko I, Destefanis M, Ding WM, Ding Y, Dong C, Dong J, Dong LY, Dong MY, Du SX, Fan JZ, Fang J, Fang SS, Fang Y, Fava L, Feng CQ, Fu CD, Fuks O, Gao Q, Gao Y, Geng C, Goetzen K, Gong WX, Gradl W, Greco M, Gu MH, Gu YT, Guan YH, Guo AQ, Guo LB, Guo T, Guo YP, Han YL, Harris FA, He KL, He M, He ZY, Held T, Heng YK, Hou ZL, Hu C, Hu HM, Hu JF, Hu T, Huang GM, Huang GS, Huang HP, Huang JS, Huang L, Huang XT, Huang Y, Hussain T, Ji CS, Ji Q, Ji QP, Ji XB, Ji XL, Jiang LL, Jiang LW, Jiang XS, Jiao JB, Jiao Z, Jin DP, Jin S, Johansson T, Kalantar-Nayestanaki N, Kang XL, Kang XS, Kavatsyuk M, Kloss B, Kopf B, Kornicer M, Kuehn W, Kupsc A, Lai W, Lange JS, Lara M, Larin P, Leyhe M, Li CH, Li C, Li C, Li D, Li DM, Li F, Li G, Li HB, Li HJ, Li JC, Li K, Li K, Li L, Li PR, Li QJ, Li T, Li WD, Li WG, Li XL, Li XN, Li XQ, Li ZB, Liang H, Liang YF, Liang YT, Lin DX, Liu BJ, Liu CL, Liu CX, Liu FH, Liu F, Liu F, Liu HB, Liu HH, Liu HM, Liu J, Liu JP, Liu K, Liu KY, Liu PL, Liu Q, Liu SB, Liu X, Liu YB, Liu ZA, Liu Z, Liu Z, Loehner H, Lou XC, Lu GR, Lu HJ, Lu HL, Lu JG, Lu XR, Lu Y, Lu YP, Luo CL, Luo MX, Luo T, Luo XL, Lv M, Ma FC, Ma HL, Ma QM, Ma S, Ma T, Ma XY, Maas FE, Maggiora M, Malik QA, Mao YJ, Mao ZP, Messchendorp JG, Min J, Min TJ, Mitchell RE, Mo XH, Mo YJ, Moeini H, Morales Morales C, Moriya K, Muchnoi NY, Muramatsu H, Nefedov Y, Nikolaev IB, Ning Z, Nisar S, Niu XY, Olsen SL, Ouyang Q, Pacetti S, Pelizaeus M, Peng HP, Peters K, Ping JL, Ping RG, Poling R, Q N, Qi M, Qian S, Qiao CF, Qin LQ, Qin XS, Qin Y, Qin ZH, Qiu JF, Rashid KH, Redmer CF, Ripka M, Rong G, Ruan XD, Sarantsev A, Schoenning K, Schumann S, Shan W, Shao M, Shen CP, Shen XY, Sheng HY, Shepherd MR, Song WM, Song XY, Spataro S, Spruck B, Sun GX, Sun JF, Sun SS, Sun YJ, Sun YZ, Sun ZJ, Sun ZT, Tang CJ, Tang X, Tapan I, Thorndike EH, Toth D, Ullrich M, Uman I, Varner GS, Wang B, Wang D, Wang DY, Wang K, Wang LL, Wang LS, Wang M, Wang P, Wang PL, Wang QJ, Wang SG, Wang W, Wang XF, Wang YD, Wang YF, Wang YQ, Wang Z, Wang ZG, Wang ZH, Wang ZY, Wei DH, Wei JB, Weidenkaff P, Wen SP, Werner M, Wiedner U, Wolke M, Wu LH, Wu N, Wu Z, Xia LG, Xia Y, Xiao D, Xiao ZJ, Xie YG, Xiu QL, Xu GF, Xu L, Xu QJ, Xu QN, Xu XP, Xue Z, Yan L, Yan WB, Yan WC, Yan YH, Yang HX, Yang L, Yang Y, Yang YX, Ye H, Ye M, Ye MH, Yu BX, Yu CX, Yu HW, Yu JS, Yu SP, Yuan CZ, Yuan WL, Yuan Y, Zafar AA, Zallo A, Zang SL, Zeng Y, Zhang BX, Zhang BY, Zhang C, Zhang CB, Zhang CC, Zhang DH, Zhang HH, Zhang HY, Zhang JJ, Zhang JQ, Zhang JW, Zhang JY, Zhang JZ, Zhang SH, Zhang XJ, Zhang XY, Zhang Y, Zhang YH, Zhang ZH, Zhang ZP, Zhang ZY, Zhao G, Zhao JW, Zhao L, Zhao L, Zhao MG, Zhao Q, Zhao QW, Zhao SJ, Zhao TC, Zhao XH, Zhao YB, Zhao ZG, Zhemchugov A, Zheng B, Zheng JP, Zheng YH, Zhong B, Zhou L, Zhou L, Zhou X, Zhou XK, Zhou XR, Zhou XY, Zhu K, Zhu KJ, Zhu XL, Zhu YC, Zhu YS, Zhu ZA, Zhuang J, Zou BS, Zou JH. Observation of η'→π+ π π+ π- and η'→π+π- π0 π0. Phys Rev Lett. 2014 Jun 27;112(25):251801. doi: 10.1103/PhysRevLett.112.251801. Epub 2014 Jun 25. PMID: 25014804.
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Phys Rev Lett. 2014 Jun 27;112(25):251801. doi: 10.1103/PhysRevLett.112.251801. Epub 2014 Jun 25.

Observation of η'→π+ π π+ π- and η'→π+π- π0 π0.

Physical review letters

M Ablikim, M N Achasov, X C Ai, O Albayrak, M Albrecht, D J Ambrose, F F An, Q An, J Z Bai, R Baldini Ferroli, Y Ban, J V Bennett, M Bertani, J M Bian, E Boger, O Bondarenko, I Boyko, S Braun, 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 J Chen, X Chen, X R Chen, Y B Chen, H P Cheng, X K Chu, Y P Chu, D Cronin-Hennessy, H L Dai, J P Dai, D Dedovich, Z Y Deng, A Denig, I Denysenko, M Destefanis, W M Ding, Y Ding, C Dong, J Dong, L Y Dong, M Y Dong, S X Du, J Z Fan, J Fang, S S Fang, Y Fang, L Fava, C Q Feng, C D Fu, O Fuks, Q Gao, Y Gao, C Geng, K Goetzen, W X Gong, W Gradl, M Greco, M H Gu, Y T Gu, Y H Guan, A Q Guo, L B Guo, T Guo, Y P Guo, Y L Han, F A Harris, K L He, M He, Z Y He, T Held, Y K Heng, Z L Hou, C Hu, H M Hu, J F Hu, T Hu, G M Huang, G S Huang, H P Huang, J S Huang, L Huang, X T Huang, Y Huang, T Hussain, C S Ji, Q Ji, Q P Ji, X B Ji, X L Ji, L L Jiang, L W Jiang, X S Jiang, J B Jiao, Z Jiao, D P Jin, S Jin, T Johansson, N Kalantar-Nayestanaki, X L Kang, X S Kang, M Kavatsyuk, B Kloss, B Kopf, M Kornicer, W Kuehn, A Kupsc, W Lai, J S Lange, M Lara, P Larin, M Leyhe, C H Li, Cheng Li, Cui Li, D Li, D M Li, F Li, G Li, H B Li, H J Li, J C Li, K Li, K Li, Lei Li, P R Li, Q J Li, T Li, W D Li, W G Li, X L Li, X N Li, X Q Li, Z B Li, H Liang, Y F Liang, Y T Liang, D X Lin, B J Liu, C L Liu, C X Liu, F H Liu, Fang Liu, Feng Liu, H B Liu, H H Liu, H M Liu, J Liu, J P Liu, K Liu, K Y Liu, P L Liu, Q Liu, S B Liu, X Liu, Y B Liu, Z A Liu, Zhiqiang Liu, Zhiqing Liu, H Loehner, X C Lou, G R Lu, H J Lu, H L Lu, J G Lu, X R Lu, Y Lu, Y P Lu, C L Luo, M X Luo, T Luo, X L Luo, M Lv, F C Ma, H L Ma, Q M Ma, S Ma, T Ma, X Y Ma, F E Maas, M Maggiora, Q A Malik, Y J Mao, Z P Mao, J G Messchendorp, J Min, T J Min, R E Mitchell, X H Mo, Y J Mo, H Moeini, C Morales Morales, K Moriya, N Yu Muchnoi, H Muramatsu, Y Nefedov, I B Nikolaev, Z Ning, S Nisar, X Y Niu, S L Olsen, Q Ouyang, S Pacetti, M Pelizaeus, H P Peng, K Peters, J L Ping, R G Ping, R Poling, N Q, M Qi, S Qian, C F Qiao, L Q Qin, X S Qin, Y Qin, Z H Qin, J F Qiu, K H Rashid, C F Redmer, M Ripka, G Rong, X D Ruan, A Sarantsev, K Schoenning, S Schumann, W Shan, M Shao, C P Shen, X Y Shen, H Y Sheng, M R Shepherd, W M Song, X Y Song, S Spataro, B Spruck, G X Sun, J F Sun, S S Sun, Y J Sun, Y Z Sun, Z J Sun, Z T Sun, C J Tang, X Tang, I Tapan, E H Thorndike, D Toth, M Ullrich, I Uman, G S Varner, B Wang, D Wang, D Y Wang, K Wang, L L Wang, L S Wang, M Wang, P Wang, P L Wang, Q J Wang, S G Wang, W Wang, X F Wang, Y D Wang, Y F Wang, Y Q Wang, Z Wang, Z G Wang, Z H Wang, Z Y Wang, D H Wei, J B Wei, P Weidenkaff, S P Wen, M Werner, U Wiedner, M Wolke, L H Wu, N Wu, Z Wu, L G Xia, Y Xia, D Xiao, Z J Xiao, Y G Xie, Q L Xiu, G F Xu, L Xu, Q J Xu, Q N Xu, X P Xu, Z Xue, L Yan, W B Yan, W C Yan, Y H Yan, H X Yang, L Yang, Y Yang, Y X Yang, H Ye, M Ye, M H Ye, B X Yu, C X Yu, H W Yu, J S Yu, S P Yu, C Z Yuan, W L Yuan, Y Yuan, A A Zafar, A Zallo, S L Zang, Y Zeng, B X Zhang, B Y Zhang, C Zhang, C B Zhang, C C Zhang, D H Zhang, H H Zhang, H Y Zhang, J J Zhang, J Q Zhang, J W Zhang, J Y Zhang, J Z Zhang, S H Zhang, X J Zhang, X Y Zhang, Y Zhang, Y H Zhang, Z H Zhang, Z P Zhang, Z Y Zhang, G Zhao, J W Zhao, Lei Zhao, Ling Zhao, M G Zhao, Q Zhao, Q W Zhao, S J Zhao, T C Zhao, X H Zhao, Y B Zhao, Z G Zhao, A Zhemchugov, B Zheng, J P Zheng, Y H Zheng, B Zhong, L Zhou, Li Zhou, X Zhou, X K Zhou, X R Zhou, X Y Zhou, K Zhu, K J Zhu, X L Zhu, Y C Zhu, Y S Zhu, Z A Zhu, J Zhuang, 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. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  4. Bochum Ruhr-University, D-44780 Bochum, Germany.
  5. University of Rochester, Rochester, New York 14627, USA.
  6. University of Science and Technology of China, Hefei 230026, People's Republic of China.
  7. INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
  8. Peking University, Beijing 100871, People's Republic of China.
  9. Indiana University, Bloomington, Indiana 47405, USA.
  10. University of Minnesota, Minneapolis, Minnesota 55455, USA.
  11. Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  12. KVI, University of Groningen, NL-9747 AA Groningen, Netherlands.
  13. Universitaet Giessen, D-35392 Giessen, Germany.
  14. Wuhan University, Wuhan 430072, People's Republic of China.
  15. Ankara University, Dogol Caddesi, 06100 Tandogan, Ankara, Turkey.
  16. Dogus University, 34722 Istanbul, Turkey.
  17. Nanjing University, Nanjing 210093, People's Republic of China.
  18. Lanzhou University, Lanzhou 730000, People's Republic of China.
  19. Huangshan College, Huangshan 245000, People's Republic of China.
  20. Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  21. University of Turin, I-10125 Turin, Italy and INFN, I-10125 Turin, Italy.
  22. Shandong University, Jinan 250100, People's Republic of China.
  23. Liaoning University, Shenyang 110036, People's Republic of China.
  24. Nankai University, Tianjin 300071, People's Republic of China.
  25. Zhengzhou University, Zhengzhou 450001, People's Republic of China.
  26. Tsinghua University, Beijing 100084, People's Republic of China.
  27. University of Eastern Piedmont, I-15121 Alessandria, Italy and INFN, I-10125 Turin, Italy.
  28. GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
  29. GuangXi University, Nanning 530004, People's Republic of China.
  30. Nanjing Normal University, Nanjing 210023, People's Republic of China.
  31. University of Hawaii, Honolulu, Hawaii 96822, USA.
  32. Central China Normal University, Wuhan 430079, People's Republic of China.
  33. Henan Normal University, Xinxiang 453007, People's Republic of China.
  34. University of the Punjab, Lahore 54590, Pakistan.
  35. Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
  36. Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  37. Hunan University, Changsha 410082, People's Republic of China.
  38. Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
  39. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
  40. Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
  41. Sichuan University, Chengdu 610064, People's Republic of China.
  42. Shanxi University, Taiyuan 030006, People's Republic of China.
  43. Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
  44. Zhejiang University, Hangzhou 310027, People's Republic of China.
  45. COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan.
  46. Seoul National University, Seoul 151-747, Korea.
  47. INFN and University of Perugia, I-06100 Perugia, Italy.
  48. Beihang University, Beijing 100191, People's Republic of China.
  49. Uludag University, 16059 Bursa, Turkey.
  50. Guangxi Normal University, Guilin 541004, People's Republic of China.
  51. Soochow University, Suzhou 215006, People's Republic of China.
  52. China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
  53. University of South China, Hengyang 421001, People's Republic of China.

PMID: 25014804 DOI: 10.1103/PhysRevLett.112.251801

Abstract

Using a sample of 1.3 × 10(9)  J/ψ events collected with the BESIII detector, we report the first observation of η(')→π(+)π(-)π(+)π(-) and η(')→π(+)π(-)π(0)π(0). The measured branching fractions are B(η(')→π(+)π(-)π(+)π(-)) = [8.53 ± 0.69(stat.) ± 0.64(syst.)]×10(-5) and B(η(')→π(+)π(-)π(0) π(0)) = [1.82 ± 0.35(stat.) ± 0.18(syst.)] × 10(-4), which are consistent with theoretical predictions based on a combination of chiral perturbation theory and vector-meson dominance.

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