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Researchers precisely measured the ratio of tau-lepton to muon decays for the Upsilon(3S) meson. This high-precision measurement agrees with the Standard Model, significantly improving upon previous uncertainties.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Experimental Physics

Background:

  • The Upsilon(3S) meson is a crucial probe for testing the Standard Model of particle physics.
  • Previous measurements of the ratio R_{τμ}^{ϒ(3S)} had large uncertainties, limiting precise comparisons with theoretical predictions.

Purpose of the Study:

  • To perform a precision measurement of the ratio R_{τμ}^{ϒ(3S)} = B(Upsilon(3S)→τ^{+}τ^{-})/B(Upsilon(3S)→μ^{+}μ^{-}).
  • To compare the measured ratio with the Standard Model prediction.
  • To improve the precision of this ratio measurement by an order of magnitude.

Main Methods:

  • Utilized a data sample of 122 million Upsilon(3S) mesons collected by the BABAR detector at the SLAC PEP-II e^{+}e^{-} collider.
  • Analyzed data at a center-of-mass energy of 10.355 GeV with an integrated luminosity of 28 fb^{-1}.
  • Calculated the ratio of branching fractions for Upsilon(3S) decays to tau-lepton and muon pairs.

Main Results:

  • The measured ratio R_{τμ}^{ϒ(3S)} is 0.966 ± 0.008 (stat) ± 0.014 (syst).
  • This result is in agreement with the Standard Model prediction of 0.9948 within 2 standard deviations.
  • The uncertainty of the current measurement is approximately ten times smaller than the previous measurement.

Conclusions:

  • The precision measurement of R_{τμ}^{ϒ(3S)} provides a stringent test of the Standard Model.
  • The agreement between the experimental result and theoretical prediction strengthens confidence in the Standard Model.
  • The significantly reduced uncertainty opens new avenues for exploring potential new physics beyond the Standard Model.