We present measurements of the charmonium state h(c) (P-1(1)) made with 106 x 10(6) psi' events collected by BESIII at BEPCII. Clear signals are observed for psi' -> pi(0)h(c) with and without the subsequent radiative decay h(c) -> gamma eta(c). First measurements of the absolute branching ratios B(psi' -> pi(0)h(c)) = (8.4 +/- 1.3 +/- 1.0 x 10(-4) and B(h(c) -> gamma eta(c)) = (54.3 +/- 6.7 +/- 5.2)% are presented. A statistics-limited determination of the previously unmeasured h(c) width leads to an upper limit Gamma(h(c)) < 1.44 MeV (90% confidence). Measurements of M(h(c)) = 3525.40 +/- 0.13 +/- 0.18 MeV/c(2) and B(psi' -> pi(0)h(c)) x B(h(c) -> gamma eta(c)) = (4.58 +/- 0.40 +/- 0.50) x 10(-4) are consistent with previous results.

Measurements of hc(1P1) in ψ′ Decays

DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2010-01-01

Abstract

We present measurements of the charmonium state h(c) (P-1(1)) made with 106 x 10(6) psi' events collected by BESIII at BEPCII. Clear signals are observed for psi' -> pi(0)h(c) with and without the subsequent radiative decay h(c) -> gamma eta(c). First measurements of the absolute branching ratios B(psi' -> pi(0)h(c)) = (8.4 +/- 1.3 +/- 1.0 x 10(-4) and B(h(c) -> gamma eta(c)) = (54.3 +/- 6.7 +/- 5.2)% are presented. A statistics-limited determination of the previously unmeasured h(c) width leads to an upper limit Gamma(h(c)) < 1.44 MeV (90% confidence). Measurements of M(h(c)) = 3525.40 +/- 0.13 +/- 0.18 MeV/c(2) and B(psi' -> pi(0)h(c)) x B(h(c) -> gamma eta(c)) = (4.58 +/- 0.40 +/- 0.50) x 10(-4) are consistent with previous results.
2010
104
132002-1
132002-6
http:// http://link.aps.org/doi/10.1103/PhysRevLett.104.132002
14.40.Pq; 12.38.Qk; 13.25.Gv
Ablikim M; Achasov MN; An L; An Q; An ZH; Bai JZ; Ban Y; Berger N; Bian JM; Boyko I; Briere RA; Bytev V; Cai X; Cao GF; Cao XX; Chang JF; Chelkov G; Chen G; Chen HS; Chen JC; Chen LP; Chen ML; Chen P; Chen SJ; Chen YB; Chu YP; Cronin-Hennessy D; Dai HL; Dai JP; Dedovich D; Deng ZY; Denysenko I; Destefanis M; Ding Y; Dong LY; Dong MY; Du SX; Duan MY; Fang J; Feng CQ; Fu CD; Fu JL; Gao Y; Geng C; Goetzen K; Gong WX; Greco M; Grishin S; Gu YT; Guo AQ; Guo LB; Guo YP; Han SQ; Harris FA; He KL; He M; He ZY; Heng YK; Hou ZL; Hu HM; Hu JF; Hu T; Hu XW; Huang B; Huang GM; Huang JS; Huang XT; Huang YP; Ji CS; Ji Q; Ji XB; Ji XL; Jia LK; Jiang LL; Jiang XS; Jiao JB; Jin DP; Jin S; Komamiya S; Kuehn W; Lange S; Leung JKC; Li C; Li C; Li DM; Li F; Li G; Li HB; Li J; Li JC; Li L; Li L; Li QJ; Li WD; Li WG; Li XL; Li XN; Li XQ; Li XR; Li YX; Li ZB; Liang H; Liang TR; Liang YT; Liang YF; Liao GR; Liao XT; Liu BJ; Liu CL; Liu CX; Liu CY; Liu FH; Liu F; Liu F; Liu GC; Liu H; Liu HB; Liu HM; Liu HW; Liu J; Liu JP; Liu K; Liu KY; Liu Q; Liu SB; Liu XH; Liu YB; Liu YF; Liu YW; Liu Y; Liu ZA; Lu GR; Lu JG; Lu QW; Lu XR; Lu YP; Luo CL; Luo MX; Luo T; Luo XL; Ma CL; Ma FC; Ma HL; Ma QM; Ma X; Ma XY; Maggiora M; Mao YJ; Mao ZP; Min J; Mo XH; Muchnoi NY; Nefedov Y; Ning FP; Olsen SL; Ouyang Q; Pelizaeus M; Peters K; Ping JL; Ping RG; Poling R; Pun CSJ; Qi M; Qian S; Qiao CF; Qiu JF; Rong G; Ruan XD; Sarantsev A; Shao M; Shen CP; Shen XY; Sheng HY; Sonoda S; Spataro S; Spruck B; Sun DH; Sun GX; Sun JF; Sun SS; Sun XD; Sun YJ; Sun YZ; Sun ZJ; Sun ZT; Tang CJ; Tang X; Tang XF; Tian HL; Toth D; Varner GS; Wan X; Wang BQ; Wang JK; Wang K; Wang LL; Wang LS; Wang P; Wang PL; Wang Q; Wang SG; Wang XD; Wang XL; Wang YD; Wang YF; Wang YQ; Wang Z; Wang ZG; Wang ZY; Wei DH; Wen SP; Wiedner U; Wu LH; Wu N; Wu W; Wu YM; Wu Z; Xiao ZJ; Xie YG; Xu GF; Xu GM; Xu H; Xu M; Xu M; Xu XP; Xu Y; Xu ZZ; Xue Z; Yan L; Yan WB; Yan YH; Yang HX; Yang M; Yang P; Yang SM; Yang YX; Ye M; Ye MH; Yu BX; Yu CX; Yu L; Yuan CZ; Yuan Y; Zeng Y; Zhang BX; Zhang BY; Zhang CC; Zhang DH; Zhang HH; Zhang HY; Zhang JW; Zhang JY; Zhang JZ; Zhang L; Zhang SH; Zhang XY; Zhang Y; Zhang YH; Zhang ZP; Zhao C; Zhao HS; Zhao JW; Zhao JW; Zhao L; Zhao L; Zhao MG; Zhao Q; Zhao SJ; Zhao TC; Zhao XH; Zhao YB; Zhao ZG; Zhemchugov A; Zheng B; Zheng JP; Zheng YH; Zheng ZP; Zhong B; Zhong J; Zhou L; Zhou ZL; Zhu C; Zhu K; Zhu KJ; Zhu QM; Zhu XW; Zhu YS; Zhu ZA; Zhuang J; Zou BS; Zou JH; Zuo JX; Zweber P
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