Observation of X(2370) and search for X(2120) in J/ψ→γKK¯η

Using a sample of 1.31×109J/ψ events collected with the BESIII detector, we perform a study of J/ψ→γKK¯η′. X(2370) is observed in the KK¯η′ invariant-mass distribution with a statistical significance of 8.3σ. Its resonance parameters are measured to be M=2341.6±6.5(stat.)±5.7(syst.)MeV/c2 and Γ=117±...

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Veröffentlicht in:	The European physical journal. C, Particles and fields Particles and fields, 2020-08, Vol.80 (8)
Hauptverfasser:	Anita, Bettoni, D, Bloms, J, Cetin, S A, Chang, W L, Chen, G, Denig, A, De, Mori F, Dong, M Y, Farinelli, R, Gao, X L, Gao, Y, Goetzen, K, Gong, L, Greco, M, Gu, M H, Guo, A Q, Guo, Y P, Guskov, A, He, K L, Huang, X Z, Jin, D P, Kappert, R, Keshk, I K, Kuessner, M, Kühn, W, Li, D M, Li F, Li G, Li, J C, Liao, L Z, Liu, B J, Liu, D, Liu, F H, Liu Huanhuan, Liu, J B, Liu, L Y, Liu, Q, Liu, X Y, Lu, H J, Lu, J D, Lusso, S, Ma, H L, Ma, L L, Maldaner, S, Malde, S, Mangoni, A, Marcello, S, Mezzadri, G, Min, J, Nakhoul, S, Nefedov, Y, Papenbrock, M, Qi M, Qian, S, Qin, X S, Qiu, J F, Qu, S Q, Ravindran, K, Rolo, M, Rosner Ch, Shao, M, Shen, P X, Sheng, H Y, Sosio, S, Sui, F F, Tan, Y X, Wang, B L, Wang, L S, Wang, P L, Wang, Y D, Wang, Y F, Wiedner, U, Xiao, S Y, Xiao, Y J, Xiao, Z J, Xie, Y H, Xu, Q J, Xu W, Yang, H J, Yang, R X, Yu, B X, Yu, C X, Yu, J S, Yuan, X Q, Zeng, Y, Zhang, C C, Zhang, J, Zhang, J Y, Zhang, J Z, Zhang, T J, Zhang, X Y, Zhang, Yan, Zhang, Yao, Zhao, Ling, Zhao, M G, Zhou, L P, Zhou, X, Zhu, X L, Zhuang, J
Format:	Artikel
Sprache:	eng
Schlagworte:	Confidence intervals Invariants Mass distribution Statistical analysis
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Beschreibung
Zusammenfassung:	Using a sample of 1.31×109J/ψ events collected with the BESIII detector, we perform a study of J/ψ→γKK¯η′. X(2370) is observed in the KK¯η′ invariant-mass distribution with a statistical significance of 8.3σ. Its resonance parameters are measured to be M=2341.6±6.5(stat.)±5.7(syst.)MeV/c2 and Γ=117±10(stat.)±8(syst.)MeV. The product branching fractions for J/ψ→γX(2370),X(2370)→K+K-η′ and J/ψ→γX(2370),X(2370)→KS0KS0η′ are determined to be (1.79±0.23(stat.)±0.65(syst.))×10-5 and (1.18±0.32(stat.)±0.39(syst.))×10-5, respectively. No evident signal for X(2120) is observed in the KK¯η′ invariant-mass distribution. The upper limits for the product branching fractions of B(J/ψ→γX(2120)→γK+K-η′) and B(J/ψ→γX(2120)→γKS0KS0η′) are determined to be 1.49×10-5 and 6.38×10-6 at the 90% confidence level, respectively.
ISSN:	1434-6044 1434-6052
DOI:	10.1140/epjc/s10052-020-8078-4