Study of the $h_c$($1^1P_1$) meson via $ψ(2S) \rightarrow π^0 h_c$ decays at BESIII
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Adlarson, P.
name: Albrecht, M.
name: Aliberti, R.
name: Amoroso, A.
name: An, M. R.
name: An, Q.
name: Bai, X. H.
name: Bai, Y.
name: Bakina, O.
name: Ferroli, R. Baldini
name: Balossino, I.
name: Ban, Y.
name: Batozskaya, V.
name: Becker, D.
name: Begzsuren, K.
name: Berger, N.
name: Bertani, M.
name: Bettoni, D.
name: Bianchi, F.
name: Bloms, J.
name: Bortone, A.
name: Boyko, I.
name: Briere, R. A.
name: Brueggemann, A.
name: Cai, H.
name: Cai, X.
name: Calcaterra, A.
name: Cao, G. F.
name: Cao, N.
name: Cetin, S. A.
name: Chang, J. F.
name: Chang, W. L.
name: Chelkov, G.
name: Chen, C.
name: Chen, G.
name: Chen, H. S.
name: Chen, M. L.
name: Chen, S. J.
name: Chen, T.
name: Chen, X. R.
name: Chen, X. T.
name: Chen, Y. B.
name: Chen, Z. J.
name: Cheng, W. S.
name: Cibinetto, G.
name: Cossio, F.
name: Cui, J. J.
name: Dai, H. L.
name: Dai, J. P.
name: Dbeyssi, A.
name: de Boer, R. E.
name: Dedovich, D.
name: Deng, Z. Y.
name: Denig, A.
name: Denysenko, I.
name: Destefanis, M.
name: De Mori, F.
name: Ding, Y.
name: Dong, J.
name: Dong, L. Y.
name: Dong, M. Y.
name: Dong, X.
name: Du, S. X.
name: Egorov, P.
name: Fan, Y. L.
name: Fang, J.
name: Fang, S. S.
name: Fang, Y.
name: Farinelli, R.
name: Fava, L.
name: Feldbauer, F.
name: Felici, G.
name: Feng, C. Q.
name: Feng, J. H.
name: Fischer, K
name: Fritsch, M.
name: Fu, C. D.
name: Gao, H.
name: Gao, Y. N.
name: Gao, Yang
name: Garbolino, S.
name: Garzia, I.
name: Ge, P. T.
name: Ge, Z. W.
name: Geng, C.
name: Gersabeck, E. M.
name: Gilman, A
name: Goetzen, K.
name: Gong, L.
name: Gong, W. X.
name: Gradl, W.
name: Greco, M.
name: Gu, L. M.
name: Gu, M. H.
name: Gu, Y. T.
name: Guan, C. Y
name: Guo, A. Q.
name: Guo, L. B.
name: Guo, R. P.
name: Guo, Y. P.
name: Guskov, A.
name: Han, T. T.
name: Han, W. Y.
name: Hao, X. Q.
name: Harris, F. A.
name: He, K. K.
name: He, K. L.
name: Heinsius, F. H.
name: Heinz, C. H.
name: Heng, Y. K.
name: Herold, C.
name: Himmelreich, M.
name: Holtmann, T.
name: Hou, G. Y.
name: Hou, Y. R.
name: Hou, Z. L.
name: Hu, H. M.
name: Hu, J. F.
name: Hu, T.
name: Hu, Y.
name: Huang, G. S.
name: Huang, K. X.
name: Huang, L. Q.
name: Huang, L. Q.
name: Huang, X. T.
name: Huang, Y. P.
name: Huang, Z.
name: Hussain, T.
name: Hüsken, N
name: Imoehl, W.
name: Irshad, M.
name: Jackson, J.
name: Jaeger, S.
name: Janchiv, S.
name: Ji, Q.
name: Ji, Q. P.
name: Ji, X. B.
name: Ji, X. L.
name: Ji, Y. Y.
name: Jia, Z. K.
name: Jiang, H. B.
name: Jiang, S. S.
name: Jiang, X. S.
name: Jiang, Y.
name: Jiao, J. B.
name: Jiao, Z.
name: Jin, S.
name: Jin, Y.
name: Jing, M. Q.
name: Johansson, T.
name: Kalantar-Nayestanaki, N.
name: Kang, X. S.
name: Kappert, R.
name: Kavatsyuk, M.
name: Ke, B. C.
name: Keshk, I. K.
name: Khoukaz, A.
name: Kiese, P.
name: Kiuchi, R.
name: Kliemt, R.
name: Koch, L.
name: Kolcu, O. B.
name: Kopf, B.
name: Kuemmel, M.
name: Kuessner, M.
name: Kupsc, A.
name: Kühn, W.
name: Lane, J. J.
name: Lange, J. S.
name: Larin, P.
name: Lavania, A.
name: Lavezzi, L.
name: Lei, Z. H.
name: Leithoff, H.
name: Lellmann, M.
name: Lenz, T.
name: Li, C.
name: Li, C.
name: Li, C. H.
name: Li, Cheng
name: Li, D. M.
name: Li, F.
name: Li, G.
name: Li, H.
name: Li, H.
name: Li, H. B.
name: Li, H. J.
name: Li, H. N.
name: Li, J. Q.
name: Li, J. S.
name: Li, J. W.
name: Li, Ke
name: Li, L. J
name: Li, L. K.
name: Li, Lei
name: Li, M. H.
name: Li, P. R.
name: Li, S. X.
name: Li, S. Y.
name: Li, T.
name: Li, W. D.
name: Li, W. G.
name: Li, X. H.
name: Li, X. L.
name: Li, Xiaoyu
name: Liang, H.
name: Liang, H.
name: Liang, H.
name: Liang, Y. F.
name: Liang, Y. T.
name: Liao, G. R.
name: Liao, L. Z.
name: Libby, J.
name: Limphirat, A.
name: Lin, C. X.
name: Lin, D. X.
name: Lin, T.
name: Liu, B. J.
name: Liu, C. X.
name: Liu, D.
name: Liu, F. H.
name: Liu, Fang
name: Liu, Feng
name: Liu, G. M.
name: Liu, H. B.
name: Liu, H. M.
name: Liu, Huanhuan
name: Liu, Huihui
name: Liu, J. B.
name: Liu, J. L.
name: Liu, J. Y.
name: Liu, K.
name: Liu, K. Y.
name: Liu, Ke
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name: Liu, Lu
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name: Lu, Y.
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name: Lu, Z. H.
name: Luo, C. L.
name: Luo, M. X.
name: Luo, T.
name: Luo, X. L.
name: Lyu, X. R.
name: Lyu, Y. F.
name: Ma, F. C.
name: Ma, H. L.
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name: Ma, R. T.
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name: Ma, Y.
name: Maas, F. E.
name: Maggiora, M.
name: Maldaner, S.
name: Malde, S.
name: Malik, Q. A.
name: Mangoni, A.
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name: Meng, Z. X.
name: Messchendorp, J. G.
name: Mezzadri, G.
name: Miao, H.
name: Min, T. J.
name: Mitchell, R. E.
name: Mo, X. H.
name: Muchnoi, N. Yu.
name: Muramatsu, H.
name: Nakhoul, S.
name: Nefedov, Y.
name: Nerling, F.
name: Nikolaev, I. B.
name: Ning, Z.
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name: Niu, Y.
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name: Pathak, A.
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name: Pelizaeus, M.
name: Peng, H. P.
name: Peters, K.
name: Ping, J. L.
name: Ping, R. G.
name: Plura, S.
name: Pogodin, S.
name: Poling, R.
name: Prasad, V.
name: Qi, H.
name: Qi, H. R.
name: Qi, M.
name: Qi, T. Y.
name: Qian, S.
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name: Qiu, J. F.
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name: Rashid, K. H.
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name: Redmer, C. F.
name: Ren, K. J.
name: Rivetti, A.
name: Rodin, V.
name: Rolo, M.
name: Rong, G.
name: Rosner, Ch.
name: Sang, H. S.
name: Sarantsev, A.
name: Schelhaas, Y.
name: Schnier, C.
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Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Using 448 million $ψ(2S)$ events, the spin-singlet $P$-wave charmonium state $h_c$(1$^1P_1$) is studied via the $ψ(2S) \rightarrow π^0 h_c$ decay followed by the $h_c \to γη_c$ transition. The branching fractions are measured to be $\mathcal{B}_{\rm Inc}(ψ(2S) \rightarrow π^0h_c) \times \mathcal{B}_{\rm Tag}(h_c \rightarrow γη_c) = (4.22 ^{+0.27}_{-0.26} \pm 0.19) \times 10^{-4}$ , $\mathcal{B}_{\rm Inc}(ψ(2S) \rightarrow π^0h_c) = (7.32 \pm 0.34 \pm 0.41) \times 10^{-4}$, and $\mathcal{B}_{\rm Tag}(h_c \rightarrow γη_c) = (57.66 ^{+3.62}_{-3.50} \pm 0.58)\%$, where the uncertainties are statistical and systematic, respectively. The $h_c$(1$^1P_1$) mass and width are determined to be $M = (3525.32 \pm 0.06 \pm 0.15)~\rm{MeV}/c^{\rm{2}}$ and ${\mathit Γ} = (0.78 ^{+0.27}_{-0.24} \pm 0.12)~\rm{MeV}$. Using the center of gravity mass of the three $χ_{cJ}$(1$^3 P_J$) mesons ($M(\rm c.o.g.)$), the $1P$ hyperfine mass splitting is estimated to be $Δ_{\rm hyp} = M(h_c) - M(\rm c.o.g.) = (0.03 \pm 0.06 \pm 0.15) ~ \rm{MeV}/c^{\rm{2}}$, which is consistent with the expectation that the $1P$ hyperfine splitting is zero at the lowest-order.