Measurement of the mass and full width of the eta(c) meson - art. no. 072001

Authors
Bai, JZ Ban, Y Bian, JG Blum, I Chen, AD Chen, GP Chen, HF Chen, HS Chen, J Chen, JC Chen, XD Chen, Y Chen, YB Cheng, BS Choi, JB Cui, XZ Ding, HL Dong, LY Du, ZZ Dunwoodie, W Gao, CS Gao, ML Gao, SQ Gratton, P Gu, JH Gu, SD Gu, WX Guo, YN Guo, ZJ Han, SW Han, Y Harris, FA He, J He, JT He, KL He, M Heng, YK Hitlin, DG Hu, GY Hu, HM Hu, JL Hu, QH Hu, T Huang, GS Huang, XP Huang, YZ Izen, JM Jiang, CH Jin, Y Jones, BD Ju, X Kang, JS Ke, ZJ Kelsey, MH Kim, BK Kim, HJ Kim, SK Kim, TY Kong, D Lai, YF Lang, PF Lankford, A Li, CG Li, D Li, HB Li, J Li, JC Li, PQ Li, W Li, WG Li, XH Li, XN Li, XQ Li, ZC Liu, B Liu, F Liu, F Liu, HM Liu, J Liu, JP Liu, RG Liu, Y Liu, ZX Lou, XC Lowery, B Lu, GR Lu, F Lu, JG Luo, XL Ma, EC Ma, JM Malchow, R Mao, HS Mao, ZP Meng, XC Mo, XH Nie, J Olsen, SL Oyang, J Paluselli, D Pan, LJ Panetta, J Park, H Porter, F Qi, ND Qi, XR Qian, CD Qiu, JF Qu, YH Que, YK Rong, G Schernau, M Shao, YY Shen, BW Shen, DL Shen, H Shen, HY Shen, XY Shi, F Shi, HZ Song, XF Standifird, J Suh, JY Sun, HS Sun, LF Sun, YZ Tang, SQ Toki, W Tong, GL Varner, GS Wang, F Wang, L Wang, LS Wang, LZ Wang, P Wang, PL Wang, SM Wang, YY Wang, ZY Weaver, M Wei, CL Wu, N Wu, YG Xi, DM Xia, XM Xie, Y Xie, YH Xu, GF Xue, ST Yan, J Yan, WG Yang, CM Yang, CY Yang, HX Yang, W Yang, XF Ye, MH Ye, SW Ye, YX Yu, CS Yu, CX Yu, GW Yu, YH Yu, ZQ Yuan, CZ Yuan, Y Zhang, BY Zhang, C Zhang, CC Zhang, DH Zhang, DH Zhang, HL Zhang, J Zhang, JW Zhang, L Zhang, L Zhang, LS Zhang, P Zhang, QJ Zhang, SQ Zhang, XY Zhang, YY Zhao, DX Zhao, HW Zhao, JW Zhao, JW Zhao, M Zhao, WR Zhao, ZG Zheng, JP Zheng, LS Zheng, YH Zheng, ZP Zhou, BQ Zhou, L Zhu, KJ Zhu, QM Zhu, YC Zhu, YS Zhu, ZA Zhuang, BA
Citation
Jz. Bai et al., Measurement of the mass and full width of the eta(c) meson - art. no. 072001, PHYS REV D, 6207(7), 2000, pp. 2001
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6207
Issue
7
Year of publication
2000
Database
ISI
SICI code
0556-2821(20001001)6207:7<2001:MOTMAF>2.0.ZU;2-O
Abstract
In a sample of 7.8 million J/psi decays collected in the Beijing Spectromet er, the process J/psi --> gamma eta(c) is observed for live different eta(c ) decay channels: K+ K- pi(+)pi(-), pi(+)pi(-)pi(+)pi(-), K+/- K(s)(o)pi(-/ +) (with K-s(o) --> pi(+)pi(-)), phi phi (with phi-->K+K-) and K(+)K(-)pi(o ). From these signals, we determine the mass of eta(c) to be 2976.6+/-2.9 /- 1.3 MeV. Combining this result with a previously reported result from a similar study using psi(2S)-->gamma eta(c) detected in the same spectromete r gives m(eta c) = 2976.3 +/- 2.3 +/- 1.2 MeV. For the combined samples, we obtain Gamma(eta c) = 11.0 +/- 8.1 +/- 4.1 MeV.