论文标题

LHC及以后的Electroweak Restoration:$ VH $频道

Electroweak Restoration at the LHC and Beyond: The $Vh$ Channel

论文作者

Huang, Li, Lane, Samuel D., Lewis, Ian M., Liu, Zhen

论文摘要

LHC正在探索刻度EW对称性的Electroweak(EW)物理。随着LHC和新的高能量攻面者将我们对标准模型的理解推向更高的能量,不仅可以探究破裂,还可以探测EW对称性的恢复。我们建议通过Goldstone Boson等效定理的收敛观察双EW玻色子产生的EW恢复。这种融合最容易在矢量玻色子和希格斯的生产($ vh $)中进行测量,$ vh $由纵向极化主导。我们通过仔细考虑Higgs真空期望值(VEV)的极限来定义EW恢复。然后,通过零VEV理论中的$ P_T^H $分布在标准型号和Goldstone Boson Plus Higgs生产的$ P_T^H $分布的比率中测量EW修复,其中$ p_t^h $是Higgs的横向动量。随着EW对称性的恢复,该比率在高能时会收敛。我们提出了一种从对撞机数据中提取该比率的方法。通过完整的信号和背景分析,我们证明了14个TEV HL-LHC可以确认该比率收敛到1-40%的精度,而在27 TEV HE-LHC下,精度为6%。我们还研究了统计检验,以量化高能量的收敛性。我们的分析提供了一个路线图,以测试金石玻色等效定理以及我们对自发损坏的对称性的理解,此外还确认了EW对称性的恢复。

The LHC is exploring electroweak (EW) physics at the scale EW symmetry is broken. As the LHC and new high energy colliders push our understanding of the Standard Model to ever-higher energies, it will be possible to probe not only the breaking of but also the restoration of EW symmetry. We propose to observe EW restoration in double EW boson production via the convergence of the Goldstone boson equivalence theorem. This convergence is most easily measured in the vector boson plus Higgs production, $Vh$, which is dominated by the longitudinal polarizations. We define EW restoration by carefully taking the limit of zero Higgs vacuum expectation value (vev). EW restoration is then measured through the ratio of the $p_T^h$ distributions between $Vh$ production in the Standard Model and Goldstone boson plus Higgs production in the zero vev theory, where $p_T^h$ is the Higgs transverse momentum. As EW symmetry is restored, this ratio converges to one at high energy. We present a method to extract this ratio from collider data. With a full signal and background analysis, we demonstrate that the 14 TeV HL-LHC can confirm that this ratio converges to one to 40% precision while at the 27 TeV HE-LHC the precision will be 6%. We also investigate statistical tests to quantify the convergence at high energies. Our analysis provides a roadmap for how to stress test the Goldstone boson equivalence theorem and our understanding of spontaneously broken symmetries, in addition to confirming the restoration of EW symmetry.

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