Observation of \(e^+ e^- \to \eta Y(2175)\) at center-of-mass energies above 3.7\(\sim\)GeV

• Published in: arXiv.org 2017-09
• Main Authors: Bettoni, D, Boger, E, Cetin, S A, Chen, M L, Chen, X, Chen, X R, Chen, Y B, Dai, H L, Denysenko, I, De Mori, F, Dong, M Y, Feng, C Q, Gao, X L, Gao, Y, Garzia, I, Gong, W X, Guo, Y, Hao, X Q, Heinsius, F H, Held, T, Holtmann, T, Huang, J S, Huang, X T, Q Ji, Jiang, X Y, Jin, S, Kang, X L, Kupsc, A, Lara, M, Li, D M, Li, J C, Kang, Li, Li, Q Y, Li, X Q, Li, Y B, Li, Z B, Liang, Y T, Liao, G R, Liu, C X, Liu, K Y, Liu, P L, Liu, S B, Long, Y F, Lu, Y P, Luo, M X, Ma, L L, Marcello, S, Messchendorp, J G, Min, T J, N Yu Muchnoi, Musiol, P, Nikolaev, I B, Ouyang, Q, Pacetti, S, Papenbrock, M, Pelizaeus, M, Pettersson, J, Qin, Z H, Rashid, K H, Ripka, M, Rosner, Ch, Shan, W, Shao, M, Shen, P X, Sheng, H Y, Song, X Y, Sun, J F, Sun, S S, Sun, Z J, Sun, Z T, Tang, X, Wang, D Y, Wang, K, Wang, X F, Wang, Z G, Wang, Z Y, Wei, D H, Wiedner, U, Xia, Y, Xie, Y G, Xu, X P, Yan, L, Yang, H J, Yang, H X, Yang, Y X, M Ye, Yin, J H, Zhang, J L, Zhang, X Y, Zhang, Y T, Zhao, T C, Zhao, Z G, Zhou, L, Zhu, K, Zhu, K J, Zhu, Z A, Zhuang, J, Zotti, L, Zou, B S, Zou, J H
• Format: Article
• Language: English
• Subjects: Center of mass; Confidence intervals; Signal processing; Statistical analysis; Storage rings (particle accelerators)
• ISSN: 2331-8422

The state \(Y(2175)\) is observed in the process \(e^+ e^- \to \eta Y(2175)\) at center-of-mass energies between 3.7 and 4.6\(\sim\)GeV with a statistical significance larger than \(10\sigma\) using data collected with the BESIII detector operating at the BEPCII storage ring. This is the first observation of the \(Y(2175)\) in this process. The mass and width of the \(Y(2175)\) are determined to be (\(2135\pm 8\pm 9\))~MeV/\(c^2\) and (\(104\pm 24\pm 12\))~MeV, respectively, and the production cross section of \(e^+ e^- \to \eta Y(2175)\to \eta\phi f_{0}(980)\to \eta\phi \pi^+ \pi^-\) is at a several hundred femtobarn level. No significant signal for the process \(e^+ e^- \to \eta' Y(2175)\) is observed and the upper limit on \(\sigma(e^+ e^- \to \eta' Y(2175))/\sigma(e^+ e^- \to \eta Y(2175))\) is estimated to be 0.43 at the 90\% confidence level. We also search for \(\psi(3686) \to \eta Y(2175)\). No significant signal is observed, indicating a strong suppression relative to the corresponding \(J/\psi\) decay, in violation of the "12\% rule."