评“大Q^2时核子自旋平均前向虚康普顿张量”
Comment on "Nucleon spin-averaged forward virtual Compton tensor at large Q^2"
摘要：
在最近的工作中，Hill和Paz将算子乘积展开应用于前向二重虚康普顿散射。由此产生的大- $Q^2$形式的振幅$W_1(0,Q^2)$是兼容的，我们通过外推的低- $Q^2$结果从手征有效场论，为我们的方法提供支持。该论文还提出了一个结果的双光子贡献的兰姆位移的μ子氢，有一个更大的不确定性比以前的工作。我们表明，这是一个高估所产生的质子极项列入扣除色散关系$W_1$。
英文摘要：
In recent work, Hill and Paz apply the operator product expansion to forward doubly virtual Compton scattering. The resulting large-$Q^2$ form of the amplitude $W_1(0,Q^2)$ is compatible with the one we obtain by extrapolation of low-$Q^2$ results from a chiral effective field theory, providing support for our approach. That paper also presents a result for the two-photon contribution to the Lamb shift in muonic hydrogen that has a much larger uncertainty than in previous work. We show that this an overestimate arising from the inclusion of the proton pole term in the subtracted dispersion relation for $W_1$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
