CompEx II：用康普顿散射研究BSM物理的途径
CompEx II: A Pathway in Search of BSM Physics using Compton Scattering
摘要：
真空折射率的恒定性和各向异性是探索超越标准模型（BSM）的理论预测的一种强有力的方式，特别是那些预测局部洛伦兹和CPT对称性破缺的理论。对于使用$1.16$ GeV电子束的能量在$9-46$ MeV范围内的光子，使用杰斐逊实验室（JLab）的Hall - C中的康普顿偏振计对真空折射率$(n-1) < 1.4 \times 10^{-8}$施加约束。然后利用真空折射率的恒星调制的缺失来约束$\sqrt{κ_X^2 + κ_Y^2} < 8.6 \times 10^{-10}$的最小标准模型扩展（MSME）参数。这些初步的一组测量结果将通过使用$11$ GeV电子束在JLab进行测量来跟进，其灵敏度比当前的领先约束好$4-8$倍。此外，量子引力模型预测了普朗克尺度下空间的晶体性质，这可能表现为真空双折射，可以通过使用圆偏振光的康普顿散射来探测。我们表明，未来的设施，如ILC提供诱人的有趣的可能性。
英文摘要：
Constancy and anisotropy of vacuum refractive index serves as a strong way to probe the predictions of theories beyond the standard model (BSM), especially those that predict breaking of local Lorentz and CPT symmetries. For photons of energies in the ranges $9-46$ MeV using a $1.16$ GeV electron beam, a constraint on vacuum refractive index, $(n-1) < 1.4 \times 10^{-8}$ was imposed using the Compton polarimeter in Hall - C of Jefferson Lab (JLab). Absence of sidereal modulation of the vacuum refractive index was then used to constrain the Minimal Standard Model Extension (MSME) parameters of $\sqrt{κ_X^2 + κ_Y^2} < 8.6 \times 10^{-10}$. These preliminary set of measurements will be followed up by measurements using the $11$ GeV electron beam at JLab with a sensitivity better than current leading constraints by a factor of $4-8$. Furthermore, quantum gravity models predict crystalline nature of space at Planck scales which may manifest as vacuum birefringence that can be probed by Compton scattering using circularly polarized light. We show that future facilities such as the ILC provide tantalizingly interesting possibilities.
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