论文标题
在$^3 $ HE上，违反不对称的均等违反不对称性的平均值的首次精确度量
First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on $^3$He
论文作者
论文摘要
我们报告了在质子发射方向上的平均侵略不对称的第一个准确度测量，在反应$^{3} \ MATHRM {HE}（\ MATHRM {n}，\ MATHRM {n}，\ MATHRM {p} $^3 \ rm {he} $ target。不对称是核子之间弱相互作用的结果，核子仍然是电脉理论最了解的方面之一。该测量为现代有效现场理论（EFT）计算提供了重要的基准。这样的测量对于确定hadronic弱相互作用的自旋异态结构是必要的。我们的不对称结果为$ a_ {pv} = \ left（1.58 \ pm 0.97〜 \ m马理{（（stat）} \ pm 0.24〜 \ mathrm {（sys）} \ right）\ times10^{ - 8} $，其对任何parity的不确定量很小的不确定量度的量度，以供应。
We report the first precision measurement of the parity-violating asymmetry in the direction of proton emission with respect to the neutron spin, in the reaction $^{3}\mathrm{He}(\mathrm{n},\mathrm{p})^{3}\mathrm{H}$, using the capture of polarized cold neutrons in an unpolarized active $^3\rm{He}$ target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the most poorly understood aspects of electro-weak theory. The measurement provides an important benchmark for modern effective field theory (EFT) calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is $A_{PV} = \left( 1.58 \pm 0.97 ~\mathrm{(stat)} \pm 0.24~\mathrm{(sys)}\right)\times10^{-8}$, which has the smallest uncertainty of any parity-violating asymmetry measurement so far.
