论文标题
在Belle搜索违反违规的Lepton风味损失损失$ B^{+} \ to K^{+}τ^\ pm \ ell^\ mp $（$ \ ell = e，μ$）
Search for the lepton flavour violating decays $B^{+} \to K^{+} τ^\pm \ell^\mp$ ($\ell = e, μ$) at Belle
论文作者
论文摘要
我们提出搜索Lepton-favour-violating衰减$ b^+ \至k^+τ^\ pm \ ell^\ mp $，使用$ \ ell =（e，μ）$，使用$ 772 \ times 10^6 $ b \ B \ B \ B \ B \ B \ B \ B}的完整数据示例，由Belle nline {b} $ pairs $ belle dector the belle dector^k. E^ - $ collider。我们使用一个事件，其中一个$ b $ meson以harronic衰变模式完全重建。我们找不到$ b^\ pm \ to k^\ pmτ\ ell $衰减的证据，并将其分支分数的上限设置为90％的置信度，$（1 $ - $ 3）\ times 10^{ - 5} $ rangage。获得的限制是世界上最好的结果。
We present a search for the lepton-flavour-violating decays $B^+ \to K^+ τ^\pm \ell^\mp$, with $\ell = (e, μ)$, using the full data sample of $772 \times 10^6$ $B\overline{B}$ pairs recorded by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We use events in which one $B$ meson is fully reconstructed in a hadronic decay mode. We find no evidence for $B^\pm \to K^\pm τ\ell$ decays and set upper limits on their branching fractions at the 90% confidence level in the $(1$-$3) \times 10^{-5}$ range. The obtained limits are the world's best results.
