$γγ\ o W^-W^+$ 在电弱次领头阶精度下的极化与关联效应
Polarization and correlation effects in $γγ\to W^-W^+$ at Next-to-Leading-Order Electroweak Accuracy
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- School of Physics, Shandong University（山东大学物理学院）
- School of Physics and Technology, University of Jinan（济南大学物理科学与技术学院）
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中文总结 AI 辅助
本文研究LHC超外围碰撞中光子-光子融合产生$W$玻色子对的电弱次领头阶修正，发现某些关联系数获得非零圈级值，虽在当前灵敏度下无关，但在千分之一精度测量时需考虑。
中文摘要 AI 辅助
我们研究了在LHC质子-质子超外围碰撞中，通过光子-光子融合产生的$W$玻色子对的极化和关联在电弱次领头阶（NLO）修正下的效应，其中两个$W$玻色子均发生轻子衰变。带电轻子的方位角关联分布，在线性阶上不受反常四规范耦合（AQGCs）贡献的影响，在微扰论上稳定在0.40\%的水平，而单个关联系数$C_{2,2}$受到高达$-33.84\%$的相对修正。一些在标准模型领头阶（LO）下消失但对AQGCs敏感的关联系数，获得了一阶非零值，量级为$10^{-4}-10^{-3}$。我们量化了($a_0/Λ^2,a_c/Λ^2$)平面中这些圈诱导基线能与AQGC贡献相竞争的区域，并发现，虽然这些基线在当前实验灵敏度下无关紧要，但一旦关联系数被测量到千分之一（per-mille）水平，就必须将其纳入考虑。
英文摘要
We study the next-to-leading order (NLO) electroweak (EW) corrections to the polarization and correlation of $W$ boson pairs produced through photon-photon fusion in proton-proton ultra-peripheral collisions at the LHC, with both $W$ bosons decaying leptonically. The azimuthal correlation distributions of the charged leptons, which receive no contribution from anomalous quartic gauge couplings (AQGCs) at linear order, are perturbatively stable at the 0.40\% level, whereas individual correlation coefficient $C_{2,2}$ receives relative corrections of up to $-33.84\%$. Some of correlation coefficients that vanish at leading order (LO) in the Standard Model but are sensitive to AQGCs acquire non-zero one-loop values of order $10^{-4}-10^{-3}$. We quantify the region of the ($a_0/Λ^2,a_c/Λ^2$) plane in which these loop-induced baselines compete with the AQGC contributions and find that, while irrelevant at the current experimental sensitivity, they must be included once the correlation coefficients are measured at the per-mille level.
