标题： μ介子对撞机的物理动机 显示英文标题

标题： Physics Motivations for a Muon Collider

摘要： 未来的μ子对撞机将在揭示和研究超出标准模型的物理方面展现出显著的能力。 一台具有可变质心能量（从$\sqrt s = 100$到 500 GeV）的第一代μ子对撞机为在$s$通道中发现和工厂式生产Higgs玻色子提供了独特的机会。 对于优异且可实现的机器能量分辨率，一个类似标准模型的Higgs玻色子（质量为$\lsim 2\mw$，与超对称/GUT模型特别相关）的总宽度和$\mupmum$耦合可以直接以相当精确的方式测量。 通过将测量的分支比乘以总宽度，可以得到相应的耦合。 因此，与仅在最小标准模型中相比，在更大的超对称参数空间范围内，可以从最小超对称模型中的轻度CP偶标准模型类似Higgs玻色子中区分出来。 对于最小超对称模型中的较重CP偶和CP奇Higgs玻色子，可以通过扫描发现以及详细测量其总宽度和某些部分宽度，适用于Higgs质量高达最大$\rts$的情况。 出色的能量分辨率、不存在束流辐射以及第一代μ介子对撞机上的轻微韧致辐射，将允许通过 $t\anti t$ 和 $\wp\wm$ 阈值研究来提高对 $\mt$ 和 $\mw$ 的测量精度。 一个多TeV的 $\mm$ 对撞机将开启超过1 TeV尺度的物理领域。 超对称粒子的成对产生甚至可以达到比自然性一致的更高质量，并且保证更重的规范子和可能非常巨大的夸克子能够大量产生，从而可以研究它们的性质。 非常重要的是，这个多TeV的对撞机将确保我们能够详细研究强相互作用的特性。 显示英文摘要

摘要： Future muon colliders will have remarkable capability for revealing and studying physics beyond the Standard Model. A first muon collider with variable c.m.\ energy in the range $\sqrt s = 100$ to 500~GeV provides unique opportunities for discovery and factory-like production of Higgs bosons in the $s$-channel. For excellent (but achievable) machine energy resolution, the total width and $\mupmum$ coupling of a SM-like Higgs boson with mass $\lsim 2\mw$ (as particularly relevant to supersymmetric/GUT models) can be directly measured with substantial precision. Multiplication of measured branching ratios by the total width yields the corresponding couplings. As a result, the light CP-even SM-like Higgs of the minimal supersymmetric model can be distinguished from the Higgs of the minimal Standard Model over a larger portion of supersymmetric parameter space than otherwise possible. Scan discovery and detailed measurements of total widths and some partial widths of the heavier CP-even and CP-odd Higgs bosons of the minimal supersymmetric model are possible for Higgs masses up to the maximum $\rts$. The excellent energy resolution, absence of beamstrahlung and mild bremsstrahlung at the first muon collider would allow increased precision for the measurement of $\mt$ and $\mw$ via $t\anti t$ and $\wp\wm$ threshold studies. A multi-TeV $\mm$ collider would open up the realm of physics above the 1 TeV scale. Pair production of supersymmetric particles up to masses even higher than consistent with naturalness would be possible, guaranteeing that the heavier gauginos and possibly very massive squarks would be abundantly produced and that their properties could be studied. Very importantly, the multi-TeV collider would guarantee our ability to perform a detailed study of a strongly-interacting