Search for lepton flavor violation in the Higgs boson decay at a linear collider
Search for lepton flavor violation in the Higgs boson decay at a linear collider
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DOI：
10.1016/j.physletb.2004.08.024
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发表时间：
2004-06
影响因子：
4.4
通讯作者：
S. Kanemura;K. Matsuda;T. Ota;T. Shindou;E. Takasugi;K. Tsumura
中科院分区：
文献类型：
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作者：
S. Kanemura;K. Matsuda;T. Ota;T. Shindou;E. Takasugi;K. Tsumura
我们通过测量线性对撞机 (LC) 上最轻的希格斯玻色子 (h0) 衰变成 τ-μ 对的分支比，讨论了在汤川相互作用中直接搜索轻子风味破坏 (LFV) 的可能性。我们在 e+e−→Zτ+τ−→Zτ±μ∓+ 缺失等背景下研究信号过程 e+e−→Z*→Zh0→Zτ±μ∓ 的重要性。采取适当的运动学切割后，背景事件的数量大大减少，因此当 h0→τ±μ∓ 的分支比大于约 10−4 时，信号就可见。在最小超对称标准模型场景中，由于轻子混合，可以在环路级别生成 h0τ±μ∓ 的有效耦合。当超对称质量参数大于TeV尺度时，支化比可大至10−4的数倍。因此，信号在 LC 上是勉强可见的。在一般的二希格斯双峰模型中，h0→τ±μ∓的分支比的可能最大值在可用的实验范围内可以达到10−3的几倍，从而获得更大的显着性。
We discuss possibility of direct search for lepton flavor violation (LFV) in Yukawa interaction by measuring the branching ratio for the decay of the lightest Higgs boson (h0) into a τ–μ pair at a linear collider (LC). We study the significance of the signal process, e+e−→Z*→Zh0→Zτ±μ∓, against the backgrounds such as e+e−→Zτ+τ−→Zτ±μ∓+ missings. After taking appropriate kinematic cuts, the number of the background event is considerably reduced, so that the signal can be visible when the branching ratio of h0→τ±μ∓is larger than about 10−4. In a minimal supersymmetric Standard Model scenario, the effective coupling of h0τ±μ∓can be generated at the loop level due to the slepton mixing. When supersymmetric mass parameters are larger than TeV scales, the branching ratio can be as large as several times 10−4. Therefore, the signal can be marginally visible at a LC. In the general two-Higgs-doublet model, the possible maximal value for the branching ratio of h0→τ±μ∓can reach to a few times 10−3within the available experimental bound, so that we can obtain larger significance.