标题： 精确希格斯物理在$γγ$对撞机上 显示英文标题

标题： Precision Higgs physics at a $γγ$ collider

摘要： 中间质量希格斯玻色子对两个光子的环状耦合是超出标准模型物理精密测试的敏感且独特的测量方法。 在本工作中，我们总结了未来直线对撞机的$\gamma \gamma$方案下部分$\Gamma (H \to \gamma \gamma)$宽度预期精度的最新结果。 重粒子通常不会退耦，标准模型与MSSM预测或2HD模型之间的差异可能在百分位范围内有所不同。 需要重新求和大的非Sudakov DL修正，并且为了避免来自三喷注末态的额外DL项，一致性要求使用Sterman-Weinberg喷注定义。 我们发现，已充分理解的背景过程$\gamma \gamma \to q \bar{q}$可以利用保守的对撞机参数对$\Gamma (H \to \gamma \gamma)$进行${\mathcal O}$(2%) 的确定。 最近在预期的$\gamma \gamma$光度方面的改进表明，双光子部分希格斯宽度的精度可以进一步提高，并且由$H \to b \bar{b}$的 BR 从$e^\pm$模式中的误差主导，目前估计在百分之一的范围内。 显示英文摘要

摘要： The loop induced coupling of an intermediate mass Higgs boson to two photons is a sensitive and unique measure for precision tests of physics beyond the Standard Model. In this work we summarize recent results on the expected precision of the partial $\Gamma (H \to \gamma \gamma)$ width at the $\gamma \gamma$ option of a future linear collider. Heavy particles do not decouple in general and differences between the SM and MSSM predictions or 2HD-models can differ in the percentile regime. Large non-Sudakov DL corrections need to be resummed and consistency requirements demand the use of the Sterman-Weinberg jet definition in order to avoid additional DL terms from three jet final states. We find that the well understood background process $\gamma \gamma \to q \bar{q}$ allows for a ${\mathcal O}$(2%) determination of $\Gamma (H \to \gamma \gamma)$ using conservative collider parameters. Recent improvements in the expected $\gamma \gamma$ luminosity suggest that the precision for the diphoton partial Higgs width can be further improved and is dominated by the error in BR($H \to b \bar{b}$) from the $e^\pm$ mode, which is presently estimated to be in the one percent regime.