论文标题
$τ$ -Lepton对的自旋相关性由于异常的磁和电偶极矩而产生
Spin correlations in $τ$-lepton pair production due to anomalous magnetic and electric dipole moments
论文作者
论文摘要
我们提出了一种简单的算法，用于计算事件权重嵌入异常的电和磁偶极矩在$ e e^-e^+ \ toτ^-τ^+（nγ）$事件中的仿真中的影响以及随后产生的$τ$ leptons的衰减。这些权重对自旋相关矩阵和总横截面的影响都被考虑。该算法准备在现场工作{\ tt kkmc}蒙特卡洛，而无需向发电机库引入任何外部更改。 例如，$ e^-e^+ \ toτ^-τ^+（nγ），\; τ^ - \至ρ^ - ν_τ\toπ^ - π^0ν_τ，\τ^+ \ toρ^+ \barν_τ\toπ^+π^0 \barν_τ$事件在10.58 GEV的中心能量中模拟。由$π^-π^0 $和$π^+π^0 $ amenta分别$ρ^ - $和$ρ^+$衰减的$π^ - π^0 $和$π^-π^0 $的分布分布$τ^ - τ^+γ$顶点。
We present a simple algorithm for the calculation of event weights embedding the effects of anomalous electric and magnetic dipole moments in simulation of $e^-e^+\to τ^-τ^+ (nγ)$ events, and the subsequent decay of the $τ$ leptons produced. The impact of these weights on the spin-correlation matrix and the total cross-section is taken into account. The algorithm is prepared to work in-situ the {\tt KKMC} Monte Carlo, without the need for introducing any external change to the generator libraries. As an example, $e^-e^+ \to τ^-τ^+ (nγ), \; τ^- \to ρ^- ν_τ\to π^- π^0 ν_τ, \ τ^+ \to ρ^+ \barν_τ\to π^+ π^0 \barν_τ$ events were simulated at a center-of-mass energy of 10.58 GeV. The distributions of the acoplanarity angle between the planes spanned by the $π^- π^0$ and the $π^+ π^0$ momenta of respectively $ρ^-$ and $ρ^+$ decays and in the rest-frame of the entirely visible $ρ^-ρ^+$ system, are presented for different values of the coupling constants incorporating anomalous electric and magnetic dipole moments in the $τ^- τ^+ γ$ vertex.
