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arXiv 1608.06503hep-phhep-thnucl-th
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手征微扰理论中的强子洛伦兹破坏

Hadronic Lorentz Violation in Chiral Perturbation Theory

Rasha Kamand, Brett Altschul, Matthias R. Schindler

摘要:

强子区中任何可能的洛伦兹破坏都必须与底层夸克水平上的洛伦兹破坏联系在一起。利用手征微扰理论研究了这两个能级上的理论之间的关系。从一个双味夸克理论,包括四维洛伦兹破坏运营商,有效的拉格朗日导出的π介子和核子,与新的条款出现在这两个部门。由于核子和π介子的洛仑兹破坏系数都与一组单独的夸克系数有关,因此可以仅使用质子和中子的观测来确定π介子洛仑兹破坏的近似界限。由此产生的四个π介子参数的界限是在$10^{-23}$水平,代表十个数量级的改进。

英文摘要:

Any possible Lorentz violation in the hadron sector must be tied to Lorentz violation at the underlying quark level. The relationships between the theories at these two levels are studied using chiral perturbation theory. Starting from a two-flavor quark theory that includes dimension-four Lorentz-violation operators, the effective Lagrangians are derived for both pions and nucleons, with novel terms appearing in both sectors. Since the Lorentz violation coefficients for nucleons and pions are all related to a single set of underlying quark coefficients, it is possible to place approximate bounds on pion Lorentz violation using only proton and neutron observations. The resulting bounds on four pion parameters are at the $10^{-23}$ level, representing improvements of ten orders of magnitude.

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。

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