# Search for Lepton Flavor Violating Decays $\tau^- \to \ell^-K^0_S$ with the BaBar Experiment

Abstract : A search for the lepton flavour violating decays $\tau^- \to l^- K^0_{\scriptscriptstyle S}$ ($l = e$ or $\mu$) has been performed using a data sample corresponding to an integrated luminosity of 469 ${fb}^{-1}$, collected with the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at the SLAC PEP-II $e^+e^-$ asymmetric energy collider. No statistically significant signal has been observed in either channel and the estimated upper limits on branching fractions are ${\cal B}(\tau^- \to e^- K^0_{\scriptscriptstyle S}) < 3.3 \times 10^{-8}$ and ${\cal B}(\tau^- \to \mu^- K^0_{\scriptscriptstyle S}) < 4.0 \times 10^{-8}$ at 90% confidence level.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00363111
Contributor : Claudine Bombar <>
Submitted on : Friday, February 20, 2009 - 11:55:09 AM
Last modification on : Wednesday, September 16, 2020 - 4:22:11 PM

### Citation

B. Aubert, M. Bona, Y. Karyotakis, J.P. Lees, V. Poireau, et al.. Search for Lepton Flavor Violating Decays $\tau^- \to \ell^-K^0_S$ with the BaBar Experiment. Physical Review D, American Physical Society, 2009, 79, pp.012004. ⟨10.1103/PhysRevD.79.012004⟩. ⟨in2p3-00363111⟩

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