Lattice study of radiative J/ψ decay to a tensor glueball.
Lattice study of radiative J/ψ decay to a tensor glueball.
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DOI：
10.1103/physrevlett.111.091601
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发表时间：
2013-04
影响因子：
8.6
通讯作者：
Yi-Bo Yang;L. Gui;Ying Chen;Chuan Liu;Yu-bin Liu;Jian-ping Ma;Jian-bo Zhang
中科院分区：
文献类型：
--
作者：
Yi-Bo Yang;L. Gui;Ying Chen;Chuan Liu;Yu-bin Liu;Jian-ping Ma;Jian-bo Zhang
在淬火晶格 QCD 形式中研究了 J/ψ 辐射衰减为纯规范张量胶球。对于两个各向异性晶格，获得的多极振幅E1(0)、M2(0)和E3(0)分别为0.114(12)(6) GeV、-0.011(5)(1) GeV和0.023(8)(1) GeV。第一个误差来自统计、Q2插值和连续统外推，第二个误差是由于尺度参数r0(-1)=410(20) MeV的不确定性造成的。因此，部分衰减宽度Г(J/ψ→γG(2++))估计为1.01(22)(10)keV，对应于大分支比1.1(2)(1)×10(-2)。还讨论了该结果的现象学含义。
The radiative decay of J/ψ into a pure gauge tensor glueball is studied in the quenched lattice QCD formalism. With two anisotropic lattices, the multipole amplitudes E1(0), M2(0), and E3(0) are obtained to be 0.114(12)(6) GeV, -0.011(5)(1) GeV, and 0.023(8)(1) GeV, respectively. The first error comes from the statistics, the Q2 interpolation, and the continuum extrapolation, while the second is due to the uncertainty of the scale parameter r0(-1)=410(20) MeV. Thus, the partial decay width Γ(J/ψ→γG(2++)) is estimated to be 1.01(22)(10) keV, which corresponds to a large branch ratio 1.1(2)(1)×10(-2). The phenomenological implication of this result is also discussed.