Scattering from finite size methods in lattice QCD
Scattering from finite size methods in lattice QCD
复制标题
晶格 QCD 中有限尺寸方法的散射
DOI：
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
D. Renner
中科院分区：
文献类型：
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作者：
Xu Feng;K. Jansen;D. Renner
利用两种形式的最大扭转质量费米子，计算了同位旋i=2通道中的S波介子-介子散射长度和同位旋i=1通道中的P波介子-介子散射相。在前者中，点阵计算是在270 MeV到485 MeV的介子质量范围内进行的。我们在次前级使用手征微扰理论来推断我们的结果。在物理介子质量下，我们得到m_pi_a_pipi(i=2)=-0.04385(28)(38)的散射长度。在后一个通道中，计算目前是在391 MeV的单个介子质量下进行的。利用有限尺寸方法，我们计算了质心坐标系和运动坐标系中的散射相位。利用有效射程公式对计算结果进行了拟合，计算了Rho共振质量和衰变宽度。
Using two flavors of maximally twisted mass fermions, we calculate the S-wave pion-pion scattering length in the isospin I=2 channel and the P-wave pion-pion scattering phase in the isospin I=1 channel. In the former channel, the lattice calculations are performed at pion masses ranging from 270 MeV to 485 MeV. We use chiral perturbation theory at next-to-leading order to extrapolate our results. At the physical pion mass, we find m_pi a_pipi(I=2)=-0.04385(28)(38) for the scattering length. In the latter channel, the calculation is currently performed at a single pion mass of 391 MeV. Making use of finite size methods, we evaluate the scattering phase in both the center of mass frame and the moving frame. The effective range formula is employed to fit our results, from which the rho resonance mass and decay width are evaluated.
影响因子：
4.4
作者：
Xu Feng;K. Jansen;D. Renner
通讯作者：
Xu Feng;K. Jansen;D. Renner