Measurements of hc(1P1) in ψ′ Decays

Ablikim, M; Achasov, Mn; L, An; Q, An; Zh, An; 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, Marco Giovanni; Ding, Y; Dong, Ly; Dong, My; Sx, Du; Duan, My; Fang, J; Feng, Cq; Cd, Fu; Jl, Fu; Gao, Y; Geng, C; Goetzen, K; Gong, Wx; Greco, Michela; Grishin, S; Yt, Gu; Guo, Aq; Guo, Lb; Guo, Yp; Han, Sq; Harris, Fa; Kl, He; M, He; Zy, He; Heng, Yk; Hou, Zl; Hm, Hu; Jf, Hu; T, Hu; Xw, Hu; Huang, B; Huang, Gm; Huang, Js; Huang, Xt; Huang, Yp; Cs, Ji; Q, Ji; Xb, Ji; Xl, Ji; Jia, Lk; Jiang, Ll; Jiang, Xs; Jiao, Jb; Jin, Dp; Jin, S; Komamiya, S; Kuehn, W; Lange, S; Jkc, Leung; 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, Li; 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; Gr, Lu; Jg, Lu; Qw, Lu; Xr, Lu; Yp, Lu; Luo, Cl; Luo, Mx; Luo, T; Luo, Xl; Cl, Ma; Fc, Ma; Hl, Ma; Qm, Ma; X, Ma; Xy, Ma; Maggiora, Marco; Mao, Yj; Mao, Zp; Min, J; Xh, Mo; Muchnoi, Ny; Nefedov, Y; Ning, Fp; Olsen, Sl; Ouyang, Q; Pelizaeus, M; Peters, K; Ping, Jl; Ping, Rg; Poling, R; Csj, Pun; M, Qi; Qian, S; Qiao, Cf; Qiu, Jf; Rong, G; Ruan, Xd; Sarantsev, A; Shao, M; Shen, Cp; Shen, Xy; Sheng, Hy; Sonoda, S; Spataro, Stefano Giovanni; 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; Lh, Wu; N, Wu; W, Wu; Ym, Wu; Z, Wu; Xiao, Zj; Xie, Yg; Gf, Xu; Gm, Xu; H, Xu; M, Xu; M, Xu; Xp, Xu; Y, Xu; Zz, Xu; Xue, Z; Yan, L; Yan, Wb; Yan, Yh; Yang, Hx; Yang, M; Yang, P; Yang, Sm; Yang, Yx; M, Ye; Mh, Ye; Bx, Yu; Cx, Yu; L, Yu; 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.

doi:10.1103/PhysRevLett.104.132002

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.