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arXiv · 0910.0423

Lepton Universality Test in Upsilon(1S) decays at BaBar

Elisa Guido
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Abstract

Using a sample of 122 million Upsilon(3S) decays collected with the BaBar detector at the PEP-II asymmetric energy collider at the SLAC National Accelerator Laboratory, we measure the ratio R_taumu=BR(Upsilon(1S)->tau^+tau^-)/BR(Upsilon(1S)->mu^+mu^-); the measurement is intended as a test of lepton universality and as a possible search for a light pseudoscalar Higgs boson in Next to Minimal Supersymmetric Standard Model (NMSSM) scenarios. Such a boson could appear in a deviation of the ratio R_taumu from the Standard Model expectation, that is 1, except for small lepton mass corrections. The analysis exploits the decays Upsilon(3S) -> Upsilon(1S) pi^+pi^-, Upsilon(1S) -> l^+l^-, where l = mu, tau.

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Elisa Guido. 2009-10-02. Lepton Universality Test in Upsilon(1S) decays at BaBar. https://arxiv.org/abs/0910.0423

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