@Article{BABARCollaborationLees_etal2020,
author="BABAR Collaboration (Lees, J. P. et al
and Martinez-Vidal, F.
and Oyanguren, A.",
title="Precision Measurement of the Ratio B(gamma(3S) -> tau(+)tau(-))/B(gamma(3S) -> mu(+)mu(-))",
journal="Physical Review Letters",
year="2020",
publisher="Amer Physical Soc",
volume="125",
number="24",
pages="241801--7pp",
abstract="We report on a precision measurement of the ratio R-tau mu(gamma(3s)) = B(gamma(3S) -> tau(+)tau(-))/B(tau(gamma(3S) ->mu(+)mu(-)) using data collected with the BABAR detector at the SLAC PEP-II e(+)e(-) collider. The measurement is based on a 28 fb(-1) data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million gamma(35) mesons. The ratio is measured to be R-tau mu(gamma(3s)) = 0.966 +/- 0.008(stat) +/- 0.014(syst) and is in agreement with the standard model prediction of 0.9948 within 2 standard deviations. The uncertainty in R-tau mu(gamma(3s)) is almost an order of magnitude smaller than the only previous measurement.",
optnote="WOS:000596461100005",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4672), last updated on Tue, 19 Jan 2021 08:38:13 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.125.241801",
opturl="https://arxiv.org/abs/2005.01230",
opturl="https://doi.org/10.1103/PhysRevLett.125.241801",
language="English"
}