论文标题
中子普罗顿质量差
The neutron-proton mass difference
论文作者
论文摘要
我们提出了中子和质子之间质量差的晶格计算，为此我们找到$ m_n -m_p = 1.73（69）\，\ text {mev} $。这是在$ qed $耦合$α_{em} $的$ u $和$ u $和$ d $ quarks $ \ frac {m_d-m_u} {λ__{qcd}} $之间的质量差的。我们采用了纯粹的习惯计划来重新归一化理论，并提供了将$ QED $和强$ ib $捐款分开的处方。使用$ N_F = 2+1+1 $ Dynamilical Quarks使用ETMC量规配置进行仿真。我们在$ 3 $ simeq 200-450 $ meV的范围内推断出$ 3 $的晶格间距和斜质质量。
We present a lattice calculation of the mass difference between neutron and proton, for which we find $ M_n - M_p = 1.73(69) \, \text{MeV}$. This is obtained at 1st order in the $QED$ coupling $α_{EM}$ and in the mass difference between $u$ and $d$ quarks $\frac{m_d-m_u}{Λ_{QCD}}$. We adopt a purely hadronic scheme to renormalize the theory and provide a prescription to separate the $QED$ and strong $IB$ contributions. The simulation is carried out using the ETMC gauge configurations with $N_f=2+1+1$ dynamical quarks. We extrapolate among $3$ values of the lattice spacing and pion masses in the range $M_π\simeq 200 - 450 $ MeV.
