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arXiv 1509.02853hep-exhep-ph
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用强子Z衰变测量未来e+e-线性对撞机上e+e- -> HZ截面的模型无关性

Model-Independent Measurement of the e+e- -> HZ Cross Section at a Future e+e- Linear Collider using Hadronic Z Decays

Mark Thomson

摘要:

未来的e+e对撞机,如ILC或CLIC,将使希格斯扇区的探测精度大大超过高亮度LHC。在e+e对撞机上进行的希格斯计划的核心部分是独立于模型确定希格斯与费米子和规范玻色子的绝对耦合。在这里,使用反冲质量技术测量e+e-->HZ Higgsstrahlung截面,确定了所有Higgs耦合测量的绝对尺度。先前的研究考虑了e+e- ->ZH,其中Z->l+l-,其中l =电子或μ子。本文首次证明了近模型无关的反冲质量技术可以推广到Z玻色子的强子衰变。因为Z->qq的分支比比Z->l+l-的大大约10倍,所以这种方法在统计上比使用轻子衰变更有效。在CLIC实验中,当质心能量为350 GeV,积分亮度为500 fb-1时,用强子反冲质量技术可以测量到e+e-->HZ截面为1.8%.在350 GeV的ILC中也发现了类似的精度。这种测量技术的质量中心的依赖性进行了讨论,主张在刚刚超过顶部对生产阈值的未来线性对撞机的初始操作。

英文摘要:

A future e+e- collider, such as the ILC or CLIC, would allow the Higgs sector to be probed with a precision significantly beyond that achievable at the High-Luminosity LHC. A central part of the Higgs programme at an e+e- collider is the model-independent determination of the absolute Higgs couplings to fermions and to gauge bosons. Here the measurement of the e+e-->HZ Higgsstrahlung cross section, using the recoil mass technique, sets the absolute scale for all Higgs coupling measurements. Previous studies have considered e+e- ->ZH with Z->l+l-, where l = electron or muon. In this paper it is shown for the first time that a near model-independent recoil mass technique can be extended to the hadronic decays of the Z boson. Because the branching ratio for Z->qq is approximately ten times greater than for Z->l+l-, this method is statistically more powerful than using the leptonic decays. For an integrated luminosity of 500 fb-1 at a centre-of-mass energy of 350 GeV at CLIC, the e+e-->HZ cross section can be measured to 1.8 % using the hadronic recoil mass technique. A similar precision is found for the ILC operating at 350 GeV. The centre-of-mass dependence of this measurement technique is discussed, arguing for the initial operation of a future linear collider at just above the top-pair production threshold.

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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