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从$e^+ e^-$ Higgs工厂的Higgs和电弱观测量探索新的物理尺度

Probing New Physics Scales from Higgs and Electroweak Observables at $e^+ e^-$ Higgs Factory

Shao-Feng Ge, Hong-Jian He, Rui-Qing Xiao

备注：
JHEP Final Version, 43 pages, 10 Tables, 6 Figs, using jheppub.sty format, only minor refinements
发表信息：
JHEP 1610 (2016) 007
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摘要：

超越标准模型（SM）的新物理可以通过6维有效算子与模型无关地表述，其系数（截断值）表征了新物理的尺度。本文研究了在未来的$e^+e^-$ Higgs工厂（如CEPC）中，从电弱精密观测量（EWPO）和Higgs观测量（HO）探索新的物理尺度。为了从所有可用的观测量优化新物理的约束，我们建立了一个方案无关的方法。在此基础上，我们将SM电弱参数和6维算符的系数放在同等的地位上，可以用同一个$χ^2$函数同时拟合。由于与SM的偏差通常很小，因此我们可以将新的物理参数扩展到线性阶，并执行分析$χ^2$拟合以导出新物理尺度的潜在范围。我们发现，Higgs产生率和衰变率的HO能探测到10 TeV的新物理标度（胶子参与算符$\mathcal{O}_g$的HO能探测到44 TeV），而Yukawa型算符的新物理标度能通过精确的Higgs耦合测量探测到（13-25）TeV.进一步包括EWPO可以将极限提高到35 TeV。从这个角度来看，我们证明了在希格斯工厂的早期阶段测量的EWPO可以像希格斯观测一样重要。希格斯工厂的这些新物理尺度的间接探测，主要可以覆盖下一代pp强子对撞机（50- 100 TeV），如SPPC和FCC-hh直接探测的能量范围。

英文摘要：

New physics beyond the standard model (SM) can be model-independently formulated via dimension-6 effective operators, whose coefficients (cutoffs) characterize the scales of new physics. We study the probe of new physics scales from the electroweak precision observables (EWPO) and the Higgs observables (HO) at the future $e^+e^-$ Higgs factory (such as CEPC). To optimize constraints of new physics from all available observables, we establish a scheme-independent approach. With this formulation, we treat the SM electroweak parameters and the coefficients of dimension-6 operators on equal footing, which can be fitted simultaneously by the same $χ^2$ function. As deviations from the SM are generally small, we can expand the new physics parameters up to linear order and perform an analytical $χ^2$ fit to derive the potential reach of the new physics scales. We find that the HO from both Higgs produnction and decay rates can probe the new physics scales up to 10TeV (and to 44TeV for the case of gluon-involved operator $\mathcal{O}_g$), and the new physics scales of Yukawa-type operators can be probed by the precision Higgs coupling measurements up to (13-25)TeV. Further including the EWPO can push the limit up to 35TeV. From this prospect, we demonstrate that the EWPO measured in the early phase of a Higgs factory can be as important as the Higgs observables. These indirect probes of new physics scales at the Higgs factory can mainly cover the energy range to be directly explored by the next generation hadron colliders of pp(50-100TeV), such as the SPPC and FCC-hh.

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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