论文标题
部分可观测时空混沌系统的无模型预测
Precision studies of quantum electrodynamics at future $e^+e^-$ colliders
论文作者
论文摘要
在假设保留的$ su（2）_l \ times u（times u（times u（1）_y $ symmetry）的情况下我们发现，实践中真正可观察到的唯一偏差对应于差异截面$（1 + \ frac {c_8〜s^2} {8παλ^4}〜\ sin^2θ）$，其中$λ$是新物理学的规模，$θ$是最终状态和$ c_的极性，我们是$ c_的最终状态。 QED偏差在未来$ \ mathrm {e^+e^ - } $设施。 $ \ mathrm {e^+e^ - } $在$ \ sqrt {s} = 3 $ TEV上运行的碰撞器可以对$ 15 TEV的$λ$ scale提供敏感性，但前提是接受和效率以per Mille级别控制。最后，我们还讨论了使用$ \ Mathrm {e^+e^+e^ - } \rightArrowγγ$进程的分析，以$ \ mathrm {e^+e^ - restrt {
We classify the possible deviations from the Standard Model in the QED-dominated $\mathrm{e^+e^-}\rightarrowγγ$ process under the assumption of a preserved $SU(2)_L \times U(1)_Y$ symmetry. We find that the only deviations really observable in practice correspond to a correction of the differential cross section by a factor $(1 + \frac{c_8~s^2}{8παΛ^4}~\sin^2θ)$, where $Λ$ is the scale of new physics, $θ$ is the polar angle of any of the final state photons and $c_8$ is a constant of order 1. We also provide sensitivity estimates for QED deviations at future $\mathrm{e^+e^-}$ facilities. An $\mathrm{e^+e^-}$ collider operating at $\sqrt{s}=3$ TeV could provide sensitivity to $Λ$ scales as large as 15 TeV, provided that acceptances and efficiencies are controlled at the per mille level. Finally, we also discuss the possibility of a measurement of the luminosity at the FCC-ee with $\lesssim 10^{-4}$ precision, using analyses of the $\mathrm{e^+e^-}\rightarrowγγ$ process at $\sqrt{s}\approx m_\mathrm{Z}$ energies.
