论文标题
来自扭曲的质量晶格QCD的MUON HVP的时间窗口
Time windows of the muon HVP from twisted-mass lattice QCD
论文作者
论文摘要
我们在所谓的短且中间的时间距离窗口中，介绍了对MUON异常磁矩的贡献的晶格确定（HVP）对MUON异常磁矩的贡献，$A_μ^{\ rm HVP} $，$a_μ^{\ rm sd} $ sd} $和$ a_____________我们采用了由$ n_f = 2 + 1 + 1 $ n_f = 2 + 1 + 1 $ Wilson-Clover Twisted-Mass夸克的口味的扩展扭曲质量协作（ETMC）产生的量规合奏，其中所有动态夸克风味都接近其物理价值。模拟的晶格间距的三个值等于$ \ simeq 0.057、0.068 $和$ 0.080 $ fm，空间晶格尺寸高达$ l \ simeq 7.6 $ 〜fm。对于短距离窗口，我们获得$a_μ^{\ rm sd} = 69.27 \，（34）\ cdot 10^{ - 10} $，与基于实验性$ e^+ e^ - $数据的分散确定一致。对于中间窗口，我们得到$a_μ^{\ rm w} = 236.3 \，（1.3）\ cdot 10^{ - 10} $，这与其他晶格协作的最新确定是一致的，但与分散性确定的确定水平为3.6 \ 3.6 \，σ$。
We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_μ^{\rm HVP}$, in the so-called short and intermediate time-distance windows, $a_μ^{\rm SD}$ and $a_μ^{\rm W}$. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ flavours of Wilson-clover twisted-mass quarks with masses of all the dynamical quark flavours tuned close to their physical values. The simulations are carried out at three values of the lattice spacing equal to $\simeq 0.057, 0.068$ and $0.080$ fm with spatial lattice sizes up to $L \simeq 7.6$~fm. For the short distance window we obtain $a_μ^{\rm SD} = 69.27\,(34) \cdot 10^{-10}$, in agreement with the dispersive determination based on experimental $e^+ e^-$ data. For the intermediate window we get instead $a_μ^{\rm W} = 236.3\,(1.3) \cdot 10^{-10}$, which is consistent with recent determinations by other lattice collaborations, but disagrees with the dispersive determination at the level of $3.6\,σ$.
