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arXiv 1404.7629hep-ph
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带电π衰变对洛伦兹破坏的限制

Limits on Lorentz violation from charged-pion decay

J. P. Noordmans, K. K. Vos

摘要:

带电π衰变为研究洛伦兹破坏提供了许多机会。利用有效场论方法,我们研究了轻子、W玻色子和夸克扇区中的洛伦兹破坏,导出了包括μ子极化在内的微分π介子衰变率。使用坐标重新定义,我们能够将第一代夸克扇区(之前没有报道过其中的边界)与轻子和W玻色子扇区联系起来。这使得计算变得容易,使我们能够在第一代夸克参数的$10^{-4}$水平上设置界限。我们的表达式的π介子衰变率可以用来限制洛伦兹破坏在未来的实验。

英文摘要:

Charged-pion decay offers many opportunities to study Lorentz violation. Using an effective field theory approach, we study Lorentz violation in the lepton, W-boson, and quark sectors and derive the differential pion-decay rate, including muon polarization. Using coordinate redefinitions we are able to relate the first-generation quark sector, in which no bounds were previously reported, to the lepton and W-boson sector. This facilitates a tractable calculation, enabling us to place bounds on the level of $10^{-4}$ on first-generation quark parameters. Our expression for the pion-decay rate can be used to constrain Lorentz violation in future experiments.

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