论文标题
从$ n_f = 2 $ lattice qcd的$ρ$ resonance带有物理亲质量的质量
The $ρ$-resonance with physical pion mass from $N_f=2$ lattice QCD
论文作者
论文摘要
我们介绍了在i = 1通道中PI散射的第一个晶格计算，其中NF = 2的动态夸克口味，包括带有斜向质量物理值的集合。我们在三个质量质量值的三个值中使用全局拟合数据，我们确定了Rho-resonance的通用参数。我们通过使用不同的方法确定能量特征值并比较逆振幅方法和Breit-Wigner型参数化来仔细研究系统的不确定性。总体而言，我们发现质量786（20）MEV和宽度180（6）MEV，包括统计和系统的不确定性。在与先前的NF = 2外推的明确分歧中，我们的质量值与实验符合度良好，而宽度略高。
We present the first-ever lattice computation of pi pi-scattering in the I=1 channel with Nf=2 dynamical quark flavours obtained including an ensemble with physical value of the pion mass. Employing a global fit to data at three values of the pion mass, we determine the universal parameters of the rho-resonance. We carefully investigate systematic uncertainties by determining energy eigenvalues using different methods and by comparing inverse amplitude method and Breit-Wigner type parametrizations. Overall, we find mass 786(20) MeV and width 180(6) MeV, including statistical and systematic uncertainties. In stark disagreement with the previous Nf=2 extrapolations from higher than physical pion mass results, our mass value is in good agreement with experiment, while the width is slightly too high.
