Institute of High Energy Physics and Theoretical Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
Phys Rev Lett. 2013 Aug 30;111(9):091601. doi: 10.1103/PhysRevLett.111.091601. Epub 2013 Aug 27.
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.
在淬火格点 QCD 形式主义中研究了 J/ψ衰变为纯规范张量胶球。通过两个各向异性的格点，得到了电四极矩振幅 E1(0)、磁偶极矩振幅 M2(0)和电三极矩振幅 E3(0)，它们分别为 0.114(12)(6) GeV、-0.011(5)(1) GeV 和 0.023(8)(1) GeV。第一个误差来自于统计、Q2 插值和连续体外推，而第二个误差则是由于标度参数 r0(-1)=410(20) MeV 的不确定性。因此，J/ψ→γG(2++)的部分衰变宽度 Γ(J/ψ→γG(2++))被估计为 1.01(22)(10) keV，这对应于一个较大的分支比 1.1(2)(1)×10(-2)。还讨论了这个结果的唯象学意义。
