Long life stau in the minimal supersymmetric standard model
Long life stau in the minimal supersymmetric standard model
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DOI：
10.1103/physrevd.73.055009
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发表时间：
2006-03-01
影响因子：
5
通讯作者：
Yamanaka, M
中科院分区：
文献类型：
--
作者：
Jittoh, T;Sato, J;Yamanaka, M
基于最小超对称标准模型，研究了LSP为中性伴子，NLSP为Stau的情形下Stau寿命。LSP和NLSP之间的质量差Δ m必须满足Δ m/m（（chi）over tilde），类似于几个%或更少，才能发生共湮灭，其中m（（chi）over tilde）是中性伴子质量。我们计算的stau寿命从衰减模式（tau）上波浪->（chi）上波浪，（chi）上波浪nu（tau）pi，和（chi）上波浪nu（tau）mu（e）nu（mu（e）），并讨论其依赖于各种参数。我们发现，对于10（-2）次，寿命在10（-22）-10（16）秒范围内
We study the stau lifetime in a scenario with the LSP taken to be a neutralino and the NLSP being a stau, based on the minimal supersymmetric Standard Model. The mass difference between the LSP and NLSP, delta m, must satisfy delta m/m((chi) over tilde)similar to a few % or less for coannihilation to occur, where m((chi) over tilde) is the neutralino mass. We calculate the stau lifetime from the decay modes (tau) over tilde ->(chi) over tilde tau, (chi) over tilde nu(tau)pi, and (chi) over tilde nu(tau)mu(e)nu(mu(e)) and discuss its dependence on various parameters. We find that the lifetime is in the range 10(-22)-10(16) sec for 10(-2)