Study of the h(c)(1(1)P(1)) meson via psi(2S) -> pi(0)h(c) decays at BESIII

Ablikim, M; Achasov, Mn; Adlarson, P; Ahmed, S; Albrecht, M; Amoroso, A; An, Q; Bai, Xh; Bai, Y; Bakina, O; Ferroli, Rb; Balossino, I; Ban, Y; Batozskaya, V; Becker, D; Begzsuren, K; Berger, N; Bertani, M; Bettoni, D; Bianchi, F; Biernat, J; Bloms, J; Bortone, A; Boyko, I; Briere, Ra; Cai, H; Cai, X; Calcaterra, A; Cao, Gf; Cao, N; Cetin, Sa; Chang, Jf; Chang, Wl; Chelkov, G; Chen, Dy; Chen, G; Chen, Hs; Chen, Ml; Chen, Sj; Chen, Xr; Chen, Yb; Cheng, W; Cibinetto, G; Cossio, F; Cui, Xf; Dai, Hl; Dai, Jp; Dai, Xc; Dbeyssi, A; de Boer, Rb; Dedovich, D; Deng, Zy; Denig, A; Denysenko, I; Destefanis, M; De Mori, F; Ding, Y; Dong, C; Dong, J; Dong, Ly; Dong, My; Sx, Du; Fang, J; Fang, Ss; Fang, Y; Farinelli, R; Fava, L; Feldbauer, F; Felici, G; Feng, Cq; Fritsch, M; Cd, Fu; Fu, Y; Gao, Xl; Gao, Y; Gao, Y; Gao, Yg; Garzia, I; Gersabeck, Em; Gilman, A; Goetzen, K; Gong, L; Gong, Wx; Gradl, W; Greco, M; Lm, Gu; Mh, Gu; Gu, S; Yt, Gu; Guan, Cy; Guo, Aq; Guo, Lb; Guo, Rp; Guo, Yp; Guskov, A; Han, S; Han, Tt; Han, Tz; Hao, Xq; Harris, Fa; Kl, He; Heinsius, Fh; Held, T; Heng, Yk; Herold, C; Himmelreich, M; Holtmann, T; Hou, Yr; Hou, Zl; Hm, Hu; Hu, Jifeng; Hu, T; Hu, Y; Huang, Gs; Huang, Lq; Huang, Xt; Huesken, N; Hussain, T; Andersson, Wi; Imoehl, W; Irshad, M; Jaeger, S; Ji, Q; Qp, Ji; Xb, Ji; Xl, Ji; Jiang, Hb; Jiang, Xs; Jiang, Xy; Jiao, Jb; Jiao, Z; Jin, S; Jin, Y; Johansson, T; Kalantar-Nayestanaki, N; Kang, Xs; Kappert, R; Kavatsyuk, M; Bc, Ke; Keshk, Ik; Khoukaz, A; Kiese, P; Kiuchi, R; Kliemt, R; Koch, L; Kolcu, Ob; Kopf, B; Kuemmel, M; Kuessner, M; Kupsc, A; Kurth, Mg; Kuhn, W; Lane, Jj; Lange, Js; Larin, P; Lavezzi, L; Leithoff, H; Lellmann, M; Lenz, T; Li, C; Ch, Li; Li, C; Dm, Li; Li, F; Li, G; Hb, Li; Hj, Li; Hn, Li; Jl, Li; Jq, Li; Li, K; Lk, Li; Li, L; Pl, Li; Pr, Li; Wd, Li; Wg, Li; Xh, Li; Xl, Li; Zb, Li; Zy, Li; Liang, H; Liang, H; Liang, Yf; Liang, Yt; Liao, Lz; Libby, J; Limphirat, A; Lin, Cx; Liu, B; Liu, Bj; Liu, Cx; Liu, D; Liu, Dy; Liu, Fh; Liu, F; Liu, F; Liu, Gm; Liu, Hm; Liu, Hh; Liu, Hh; Liu, Jb; Liu, Jy; Liu, K; Liu, Ky; Liu, K; Liu, L; Liu, Ly; Liu, Q; Liu, Sb; Liu, T; Liu, X; Liu, Yb; Liu, Za; Liu, Zq; Long, Yf; Lou, Xc; Hj, Lu; Jd, Lu; Jg, Lu; Xl, Lu; Lu, Y; Yp, Lu; Luo, Cl; Luo, Mx; Luo, Pw; Luo, T; Luo, Xl; Lusso, S; Lyu, Xr; Fc, Ma; Hl, Ma; Ll, Ma; Mm, Ma; Qm, Ma; Rq, Ma; Rt, Ma; Xn, Ma; Xx, Ma; Xy, Ma; Ym, Ma; Maas, Fe; Maggiora, M; Maldaner, S; Malde, S; Malik, Qa; Mangoni, A; Mao, Yj; Mao, Zp; Marcello, S; Meng, Zx; Messchendorp, Jg; Mezzadri, G; Min, Tj; Mitchell, Re; Xh, Mo; Yj, Mo; Muchnoi, Ny; Muramatsu, H; Nakhoul, S; Nefedov, Y; Nerling, F; Nikolaev, Ib; Ning, Z; Nisar, S; Olsen, Sl; Ouyang, Q; Pacetti, S; Pan, Y; Pan, Y; Papenbrock, M; Pathak, A; Patteri, P; Pelizaeus, M; Peng, Hp; Peters, K; Pettersson, J; Ping, Jl; Ping, Rg; Pitka, A; Poling, R; Prasad, V; Qi, H; Qi, M; Ty, Qi; Qian, S; Qiao, Cf; Qin, Lq; Qin, Xp; Qin, Xs; Qin, Zh; Qiu, Jf; Sq, Qu; Rashid, Kh; Ravindran, K; Redmer, Cf; Rivetti, A; Rodin, V; Rolo, M; Rong, G; Rosner, C; Rump, M; Sarantsev, A; Savrigcu, M; Schelhaas, Y; Schnier, C; Schoenning, K; Shan, W; Shan, Xy; Shao, M; Shen, Cp; Shen, Px; Shen, Xy; Shi, Hc; Shi, Rs; Shi, X; Shi, Xd; Song, Jj; Song, Wm; Song, Yx; Sosio, S; Spataro, S; Sui, Ff; Sun, Gx; Sun, Jf; Sun, L; Sun, Ss; Sun, T; Sun, Wy; Sun, Yj; Sun, Yk; Sun, Yz; Sun, Zt; Tan, Yx; Tang, Cj; Tang, Gy; Thoren, V; Tsednee, B; Uman, I; Wang, B; Wang, Bl; Wang, Cw; Wang, Dy; Wang, Hp; Wang, K; Wang, Ll; Wang, M; Wang, Mz; Wang, M; Wang, Wp; Wang, X; Wang, Xf; Wang, Xl; Wang, Y; Wang, Y; Wang, Yd; Wang, Yf; Wang, Yq; Wang, Z; Wang, Zy; Wang, Zy; Wang, Zy; Weber, T; Wei, Dh; Weidenkaff, P; Weidner, F; Wen, Hw; Wen, Sp; White, Dj; Wiedner, U; Wilkinson, G; Wolke, M; Wollenberg, L; Jf, Wu; Lh, Wu; Lj, Wu; Wu, Z; Xia, L; Xiao, Sy; Xiao, Yj; Xiao, Zj; Xie, Yg; Xie, Yh; Xing, Ty; Xiong, Xa; Gf, Xu; Jj, Xu; Qj, Xu; Xu, W; Xp, Xu; Yan, L; Yan, Wb; Yan, Wc; Yang, Hj; Yang, Hx; Yang, L; Yang, Rx; Yang, Sl; Yang, Yh; Yang, Yx; Yang, Yf; Yang, Z; Ye, M; Mh, Ye; Yin, Jh; You, Zy; Bx, Yu; Cx, Yu; Yu, G; Js, Yu; Yu, T; Yuan, Cz; Yuan, W; Yuan, Xq; Yuan, Y; Yue, Cx; Zafar, Aa; Zeng, X; Zeng, Y; Zhang, Yh; Zhang, Aq; Zhang, Bl; Zhang, Bx; Zhang, Gy; Zhang, H; Zhang, Hh; Zhang, Hy; Zhang, Jl; Zhang, Jq; Zhang, Jw; Zhang, Jy; Zhang, Jz; Zhang, Jy; Zhang, Jw; Zhang, Lm; Zhang, L; Zhang, S; Zhang, Sl; Zhang, Xd; Zhang, Xm; Zhang, Xy; Zhang, Xy; Zhang, Y; Zhang, Yt; Zhang, Y; Zhang, Y; Zhang, Y; Zhang, Zh; Zhang, Zy; Zhao, G; Zhao, J; Zhao, Jy; Zhao, Jz; Zhao, L; Zhao, L; Zhao, Mg; Zhao, Q; Zhao, Sj; Zhao, Yb; Zhao, Zg; Zhemchugov, A; Zheng, B; Zheng, Jp; Zheng, Y; Zheng, Yh; Zhong, B; Zhong, C; Zhou, Lp; Zhou, Q; Zhou, X; Zhou, Xk; Zhou, Xr; Zhu, An; Zhu, J; Zhu, K; Zhu, Kj; Zhu, Sh; Zhu, Wj; Zhu, Xl; Zhu, Yc; Zhu, Za; Zou, Bs; Zou, Jh

doi:10.1103/PhysRevD.106.072007

Using 448 million psi(2S) events, the spin-singlet P-wave charmonium state h(c)(1(1)P(1)) is studied via the psi(2S) -> pi(0)h(c) decay followed by the h(c) -> gamma eta(c) transition. The branching fractions are measured to be B-Inc(psi(2S) -> pi(0)h(c)) x B-Tag (h(c) -> gamma eta(c)) = (4.22(-0.26)(+0.27) +/- 0.19) x 10(-4), B-Inc (psi(2S) -> pi(0)h(c)) = (7.32 +/- 0.34 +/- 0.41) x 10(-4) , and B-Tag (h(c) -> gamma eta(c)) = (57.66(-3.50)(+3.62) +/- 0.58)%, where the uncertainties are statistical and systematic, respectively. The h(c)(1(1)P(1)) mass and width are determined to be M = (3525.32 +/- 0.06 +/- 0.15) MeV/c(2) and Gamma = (0.78(-0.24)(+0.27)+/- 0.12) MeV. Using the center of gravity mass of the three chi(cJ) (1(3)P(J)) mesons [M(c.o.g.)], the 1P hyperfine mass splitting is estimated to be Delta(hyp) = M(h(c)) - M(c.o.g.) = (0.03 +/- 0.06 +/- 0.15) MeV/c(2), which is consistent with the expectation that the 1P hyperfine splitting is zero at the lowest order.