研究希格斯玻色子的高亮度电子对撞机
A High Luminosity e+e- Collider to study the Higgs Boson
摘要：
在大型强子对撞机（LHC）的实验中发现了一个强有力的标准模型标量玻色子候选者H（126）。为了以前所未有的精度研究这种基本粒子，并对标准模型的闭合性进行精度测试，我们研究了一台e+e-储存环对撞机所提供的可能性。我们使用受B工厂启发的设计，考虑到LEP 2所实现的性能，并将同步辐射功率限制为100 MW。在最相关的质心能量为240 GeV的情况下，对于一个周长为27公里的环，在多达四个碰撞点上可能有10^34 cm^{-2}s^{-1}的接近恒定的光度。可达到的光度随着弯曲半径的增加而增加，对于80 km周长，四个碰撞点的5 × 10^34 cm^{-2}s^{-1}的光度似乎是可行的。在这些高光度下，束辐射变得相关，导致在加速系统和光学系统中都需要大动量接受的设计要求。更大的机器可以达到顶夸克阈值，在Z极（91 GeV）每个相互作用点产生的亮度为10^36 cm^{-2}s^{-1}，在W对产生阈值（80 GeV每束）产生的亮度为2 10^35 cm^{-2}s^{-1}。相对于在LEP处的能量扩展，在较大的环中能量扩展减小，这给出了用于能量校准目的的光束偏振应可高达W对阈值的置信度。概述了物理性能方面的能力。
英文摘要：
A strong candidate for the Standard Model Scalar boson, H(126), has been discovered by the Large Hadron Collider (LHC) experiments. In order to study this fundamental particle with unprecedented precision, and to perform precision tests of the closure of the Standard Model, we investigate the possibilities offered by An e+e- storage ring collider. We use a design inspired by the B-factories, taking into account the performance achieved at LEP2, and imposing a synchrotron radiation power limit of 100 MW. At the most relevant centre-of-mass energy of 240 GeV, near-constant luminosities of 10^34 cm^{-2}s^{-1} are possible in up to four collision points for a ring of 27km circumference. The achievable luminosity increases with the bending radius, and for 80km circumference, a luminosity of 5 10^34 cm^{-2}s^{-1} in four collision points appears feasible. Beamstrahlung becomes relevant at these high luminosities, leading to a design requirement of large momentum acceptance both in the accelerating system and in the optics. The larger machine could reach the top quark threshold, would yield luminosities per interaction point of 10^36 cm^{-2}s^{-1} at the Z pole (91 GeV) and 2 10^35 cm^{-2}s^{-1} at the W pair production threshold (80 GeV per beam). The energy spread is reduced in the larger ring with respect to what is was at LEP, giving confidence that beam polarization for energy calibration purposes should be available up to the W pair threshold. The capabilities in term of physics performance are outlined.
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