Observation of ψ(3686)→η′e+e

Using a data sample of 448.1×106ψ(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay ψ(3686)→η′e+e−, with significances of 7.0σ and 6.3σ when reconstructing the η′ meson via its decay modes η′→γπ+π− and η′→π+π−η...

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Veröffentlicht in:	Physics letters. B 2018-08, Vol.783 (C), p.452-458
Hauptverfasser:	Ahmed, S., Albrecht, M., Bakina, O., Bertani, M., Chen, S.J., Cossio, F., Dai, H.L., Dai, J.P., Dong, M.Y., Dou, Z.L., Duan, P.F., Fang, S.S., Feng, C.Q., Garillon, B., Gu, M.H., Guo, Y.P., Harris, F.A., Held, T., Hu, Y., Ikegami Andersson, W., Kalantar-Nayestanaki, N., Kang, X.S., Khoukaz, A., Kopf, B., Kupsc, A., Lange, J.S., Lara, M., Larin, P., Li, F., Li, H.J., Li, Ke, Li, P.R., Li, Q.Y., Li, X.L., Li, X.N., Liu, D.Y., Liu, Huanhuan, Liu, J.Y., Liu, Z.A., Lu, H.J., Luo, C.L., Lusso, S., Lyu, X.R., Ma, H.L., Ma, Q.M., Ma, Y.M., Messchendorp, J.G., Mezzadri, G., Mitchell, R.E., Mo, Y.J., Muramatsu, H., Nefedov, Y., Ning, Z., Pacetti, S., Peng, H.P., Pettersson, J., Qin, X.S., Qiu, J.F., Rashid, K.H., Ripka, M., Rong, G., Savrié, M., Shen, C.P., Shen, P.X., Shen, X.Y., Shi, X., Sun, L., Sun, X.H., Sun, Y.K., Sun, Y.Z., Sun, Z.J., Sun, Z.T., Tapan, I., Tiemens, M., Wang, L.S., Wang, P.L., Wang, W.P., Wang, Y.F., Wang, Y.Q., Wang, Z.Y., Wolke, M., Xia, L., Xiao, Y.J., Xu, Q.J., Yang, Y.H., Ye, M.H., Yuan, Y., Zeng, Y., Zhang, D.H., Zhang, H.Y., Zhang, J.L., Zhang, K., Zhang, Z.H., Zhao, J.W., Zhao, Y.B., Zhou, Q., Zhou, X., Zhou, Xiaoyu, Zhou, Xu, Zhu, X.L.
Format:	Artikel
Sprache:	eng
Schlagworte:	[formula omitted] Annihilation BESIII Charmonium Dalitz decay e+e− annihilation NUCLEAR PHYSICS AND RADIATION PHYSICS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Beschreibung
Zusammenfassung:	Using a data sample of 448.1×106ψ(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay ψ(3686)→η′e+e−, with significances of 7.0σ and 6.3σ when reconstructing the η′ meson via its decay modes η′→γπ+π− and η′→π+π−η (η→γγ), respectively. The weighted average branching fraction is determined to be B(ψ(3686)→η′e+e−)=(1.90±0.25±0.11)×10−6, where the first uncertainty is statistical and the second systematic.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2018.05.038