论文标题
质子螺旋性Parton分布功能的风味分解
Flavor decomposition for the proton helicity parton distribution functions
论文作者
论文摘要
我们首次提出\ textIt {ab intio}计算质子的Quark Helicity Parton分布功能。该计算是在晶状体质量改良的Fermion fermion QCD中执行的，使用一个动力学，向下，奇怪和魅力夸克的质量为260 meV。晶格矩阵元素是非扰动性重归于的，最终结果以$ \叠加{\ rm MS} $方案的比例为2 GEV中。我们在$ΔU^+（x）$和$ΔD^+（x）$上给出结果，包括断开连接的夸克环贡献，以及$ΔS^+（x）$。对于后者，与现象学估计值相比，我们实现了前所未有的精度。
We present, for the first time, an \textit{ab initio} calculation of the individual up, down and strange quark helicity parton distribution functions for the proton. The calculation is performed within the twisted mass clover-improved fermion formulation of lattice QCD using one ensemble of dynamical up, down, strange and charm quarks with a pion mass of 260 MeV. The lattice matrix elements are non-perturbatively renormalized and the final results are presented in the $\overline{ \rm MS}$ scheme at a scale of 2 GeV. We give results on the $Δu^+(x)$ and $Δd^+(x)$, including disconnected quark loop contributions, as well as on the $Δs^+(x)$. For the latter we achieve unprecedented precision compared to the phenomenological estimates.
