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在高能e^+e^-对撞机上测量希格斯玻色子的自耦合

Measuring the Higgs Boson Self-coupling at High Energy e^+e^- Colliders

U. Baur

备注：
revtex3, 38 pages, 12 figures, 6 tables
发表信息：
Phys.Rev.D80:013012,2009
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摘要：

在e^+e^对撞机上产生的标准模型希格斯粒子对有能力确定希格斯玻色子的自耦合λ。本文详细分析了e^+e^- -> ZHH和e^+e^- -> ν \bar νHH信号通道以及相关的背景过程，这些信号通道适用于未来的质心能量为\sqrt{s} =0.5 TeV、1 TeV和3 TeV的e^+e^-线性对撞机。特别注意的作用，非共振费曼图发挥，信号和背景截面的理论不确定性。我还推导出λ的定量灵敏度限值。我发现，只有当希格斯玻色子的质量相对接近其当前的下限时，\sqrt{s} =0.5 TeV的e^+e^-对撞机才能对λ设置有意义的界限。在\sqrt{s} =1 TeV（3 TeV）的e^+e^-对撞机上，对于几个ab^{-1}范围内的积分亮度和m_H=120-180 GeV范围内的希格斯玻色子质量，λ可以以20-80%（10-20%）的精度确定。

英文摘要：

Standard Model Higgs pair production at e^+e^- colliders has the capability to determine the Higgs boson self-coupling λ. I present a detailed analysis of the e^+e^- -> ZHH and e^+e^- -> ν\barνHH signal channels, and the relevant background processes, for future e^+e^- linear colliders with center of mass energies of \sqrt{s}=0.5 TeV, 1 TeV, and 3 TeV. Special attention is given to the role non-resonant Feynman diagrams play, and the theoretical uncertainties of signal and background cross sections. I also derive quantitative sensitivity limits for λ. I find that an e^+e^- collider with \sqrt{s}=0.5 TeV can place meaningful bounds on λonly if the Higgs boson mass is relatively close to its current lower limit. At an e^+e^- collider with \sqrt{s}=1 TeV (3 TeV), λcan be determined with a precision of 20-80% (10-20%) for integrated luminosities in the few ab^{-1} range and Higgs boson masses in the range m_H=120-180 GeV.

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