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The BaBar collaboration has measured the ratio$R_{\tau\mu}^{\Upsilon(3S)}=\mathcal{B}(\Upsilon(3S)\rightarrow\tau^+\tau^-)/\mathcal{B}(\Upsilon(3S)\rightarrow\mu^+\mu^-)$with a high level of precision. This measurement utilized a 28 fb$^{-1}$dataset collected at a center-of-mass energy of 10.355 GeV. The measured ratio,$R_{\tau\mu}^{\Upsilon(3S)}$, is measured to be$R_{\tau\mu}^{\Upsilon(3S)}=0.966\pm0.008_{\textrm{stat}}\pm0.014_{\textrm{syst}}$.This value is within 2 standard deviations of the standard model prediction$R_{\tau\mu}^{\Upsilon(3S)}$=0.9948. The new measurement is approximately afactor of 6$\times$ more precise than the only prior measurement. Thisincreased precision is in part due to a more complete analysis of the radiativetail in the $\Upsilon(3S)$ decay, in addition to a significant increase instatistics.

Precision measurement of the ratio  $\mathcal{B}$$\left(\Upsilon(3S)\rightarrow\tau^+\tau^-\right)/\mathcal{B}$$\left(\Upsilon(3S)\rightarrow\mu^+\mu^-\right)$