在J/ψ→γπ⁺π⁻η⁻中对χ(1835)共振的观测。
Observation of a resonance in Chi(1835) in J/psi --> gammapi+ pi- eta-.
作者信息
Ablikim M, Bai J Z, Ban Y, Bian J G, Cai X, Chen H F, Chen H S, Chen H X, Chen J C, Chen Jin, Chen Y B, Chi S P, Chu Y P, Cui X Z, Dai Y S, Deng Z Y, Dong L Y, Dong Q F, Du S X, Du Z Z, Fang J, Fang S S, Fu C D, Gao C S, Gao Y N, Gu S D, Gu Y T, Guo Y N, Guo Y Q, Guo Z J, Harris F A, He K L, He M, Heng Y K, Hu H M, Hu T, Huang G S, Huang X P, Huang X T, Ji X B, Jiang X S, Jiao J B, Jin D P, Jin S, Jin Yi, Lai Y F, Li G, Li H B, Li H H, Li J, Li R Y, Li S M, Li W D, Li W G, Li X L, Li X Q, Li Y L, Liang Y F, Liao H B, Liu C X, Liu F, Liu Fang, Liu H H, Liu H M, Liu J, Liu J B, Liu J P, Liu R G, Liu Z A, Lu F, Lu G R, Lu H J, Lu J G, Luo C L, Ma F C, Ma H L, Ma L L, Ma Q M, Ma X B, Mao Z P, Mo X H, Nie J, Olsen S L, Peng H P, Qi N D, Qin H, Qiu J F, Ren Z Y, Rong G, Shan L Y, Shang L, Shen D L, Shen X Y, Sheng H Y, Shi F, Shi X, Sun H S, Sun J F, Sun S S, Sun Y Z, Sun Z J, Tan Z Q, Tang X, Tian Y R, Tong G L, Varner G S, Wang D Y, Wang L, Wang L S, Wang M, Wang P, Wang P L, Wang W F, Wang Y F, Wang Z, Wang Z Y, Wang Zhe, Wang Zheng, Wei C L, Wei D H, Wu N, Xia X M, Xie X X, Xin B, Xu G F, Xu Y, Yan M L, Yang F, Yang H X, Yang J, Yang Y X, Ye M H, Ye Y X, Yi Z Y, Yu G W, Yuan C Z, Yuan J M, Yuan Y, Zang S L, Zeng Y, Zeng Yu, Zhang B X, Zhang B Y, Zhang C C, Zhang D H, Zhang H Y, Zhang J W, Zhang J Y, Zhang Q J, Zhang X M, Zhang X Y, Zhang Y Y, Zhang Z P, Zhang Z Q, Zhao D X, Zhao J W, Zhao M G, Zhao P P, Zhao W R, Zhao Z G, Zheng H Q, Zheng J P, Zheng Z P, Zhou L, Zhou N F, Zhu K J, Zhu Q M, Zhu Y C, Zhu Yingchun, Zhu Y S, Zhu Z A, Zhuang B A, Zhuang X A, Zou B S
机构信息
Institute of High Energy Physics, Beijing, People's Republic of China.
出版信息
Phys Rev Lett. 2005 Dec 31;95(26):262001. doi: 10.1103/PhysRevLett.95.262001. Epub 2005 Dec 28.
The decay channel J/psi --> gamma(pi)(+)pi(-)eta is analyzed using a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A resonance, the Chi(1835), is observed in the pi(+)pi(-)eta invariant-mass spectrum with a statistical significance of 7.7 sigma. A fit with a Breit-Wigner function yields a mass M = 1833.7 +/- 6.1(stat) +/- 2.7(syst) MeV/c(2), a width Tau = 67.7 +/- 20.3(stat) +/- 7.7(syst) MeV/c(2), and a product branching fraction B(J/psi --> gammaChi) . B(Chi --> pi(+)pi(-)eta) = [2.2 +/- 0.4(stat) +/- 0.4(syst)] x 10(-4). The mass and width of the Chi(1835) are not compatible with any known meson resonance. Its properties are consistent with expectations for the state that produces the strong pp mass threshold enhancement observed in the J/psi --> gammapp process at BESII.
利用北京谱仪（BESII）探测器收集的5.8×10⁷个J/ψ事例样本，对衰变道J/ψ→γπ⁺π⁻η进行了分析。在π⁺π⁻η不变质量谱中观测到一个共振态，即χ(1835)，其统计显著性为7.7σ。用布赖特 - 维格纳函数拟合得到质量M = 1833.7±6.1（统计）±2.7（系统）MeV/c²，宽度Γ = 67.7±20.3（统计）±7.7（系统）MeV/c²，以及乘积分支比B(J/ψ→γχ)·B(χ→π⁺π⁻η) = [2.2±0.4（统计）±0.4（系统）]×10⁻⁴。χ(1835)的质量和宽度与任何已知的介子共振态均不相符。其性质与对在BESII的J/ψ→γpp过程中观测到的强pp质量阈增强所产生的态的预期一致。
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