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arXiv 1602.01181hep-ph
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在超级Charm-Tau工厂寻找$τ\rightarrow μγ$轻子味破坏衰变

Searching for $τ\rightarrow μγ$ lepton-flavor-violating decay at super charm-tau factory

Zhou Hao, Zhang Ren-You, Han Liang, Ma Wen-Gan, Guo Lei, Chen Chong

备注：
15 pages, 9 figures
发表信息：
Eur. Phys. J. C 76 (2016) 421
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摘要：

我们研究了在超级Charm-Tau工厂（CTF）中寻找轻子味违反（LFV）$τ\rightarrow μγ$稀有衰变的可能性。通过比较LFV信号和标准模型（SM）背景的运动学分布，我们开发了一个优化的事件选择标准，可以显着减少背景事件。结果表明，在CTF上可以得到约为$Br(τ\rightarrow μγ)$上的$1.9 \times 10^{-9}$的新的$2 σ$上限，这超出了Super-B工厂寻找$τ$轻子稀有衰变的能力.在标量轻夸克模型的框架下，由$Br(τ\rightarrow μγ)$的上界可以导出$λ_1 λ_2$和$M_{LQ}$的联合约束。通过CTF处预期的$1000~ fb^{-1}$数据，我们得到$95\%$置信水平（C.L.）下的$λ_1λ_2 < 7.2 \times 10^{-2}~(M_{LQ} = 800~ {\rm GeV})$和$M_{LQ} > 900~{\rm GeV}~(λ_1 λ_2 = 9 \times 10^{-2})$。

英文摘要：

We investigate the possibility of searching the lepton-flavor-violating (LFV) $τ\rightarrow μγ$ rare decay at the Super Charm-Tau Factory (CTF). By comparing the kinematic distributions of the LFV signal and the standard model (SM) background, we develop an optimized event selection criteria which can significantly reduce the background events. It is concluded that new $2 σ$ upper limit of about $1.9 \times 10^{-9}$ on $Br(τ\rightarrow μγ)$ can be obtained at the CTF, which is beyond the capability of Super-B factory in searching $τ$ lepton rare decay. Within the framework of the scalar leptoquark model, a joint constraint on $λ_1 λ_2$ and $M_{LQ}$ can be derived from the upper bound on $Br(τ\rightarrow μγ)$. With $1000~ fb^{-1}$ data expected at the CTF, we get $λ_1λ_2 < 7.2 \times 10^{-2}~(M_{LQ} = 800~ {\rm GeV})$ and $M_{LQ} > 900~{\rm GeV}~(λ_1 λ_2 = 9 \times 10^{-2})$ at $95\%$ confidence level (C.L.).

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