Most Strange Dibaryon from Lattice QCD
Most Strange Dibaryon from Lattice QCD
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DOI：
10.1103/physrevlett.120.212001
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发表时间：
2018-05-23
影响因子：
8.6
通讯作者：
Nemura, Hidekatsu
中科院分区：
文献类型：
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作者：
Gongyo, Shinya;Sasaki, Kenji;Nemura, Hidekatsu
在（2 + 1）味格点QCD模拟的基础上，研究了S-1（0）通道中的Omega Omega系统（最奇异的重子），该系统具有大体积（8.1 fm）（3）和近似物理的π介子质量m（pi），在格点间距近似等于0.0846 fm时，m（pi）近似等于146 MeV。用HAL QCD方法对格点QCD数据进行了分析，得到散射长度a（0）= 4.6（6）（（+1.2）（-0.5））fm，有效射程r（eff）= 1.27（3）（（+0.06）（-0.03））fm，结合能B-Omega = 1.6（6）（（+0.7）（-0.6））MeV.这些结果表明，欧米茄欧米茄系统具有整体吸引力，并位于附近的幺正制度。通过相对论重离子碰撞中的动量对关联，可以在实验上找到这样一个系统。
The Omega Omega system in the S-1(0) channel (the most strange dibaryon) is studied on the basis of the (2 + 1)-flavor lattice QCD simulations with a large volume (8.1 fm)(3) and nearly physical pion mass m(pi) similar or equal to 146 MeV at a lattice spacing of a similar or equal to 0.0846 fm. We show that lattice QCD data analysis by the HAL QCD method leads to the scattering length a(0) = 4.6(6) ((+1.2)(-0.5)) fm, the effective range r(eff) = 1.27(3)((+0.06)(-0.03)) fm, and the binding energy B-Omega Omega = 1.6(6)((+0.7)(-0.6)) MeV. These results indicate that the Omega Omega system has an overall attraction and is located near the unitary regime. Such a system can be best searched experimentally by the pair-momentum correlation in relativistic heavy-ion collisions.