2,446 research outputs found

    Test of QED to fourth order by study of four-lepton final states in e(+)e(−) interactions at 29 GeV with the HRS detector

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.42.2180.Data taken with the High Resolution Spectrometer detector at the SLAC storage ring PEP were used to test QED to fourth order in the coupling constant α. The experiment studied four-lepton final states produced at high Q(2) in e(+)e(−) interactions at s√=29 GeV. All four final-state particles were detected at large angles with respect to the beam axis. We observed 17 e(+)e(−)e(+)e(−), 24 e(+)e(−)μ(+)μ(−), and 1 μ(+)μ(−)μ(+)μ(−) events with pair masses greater than 1 GeV/c(2) for an integrated luminosity of 291 pb(−1). The complete α(4) QED calculation agrees reasonably well with the data

    P-wave charmed mesons in e(+)e(−) annihilation

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.41.774

    Measurement of the Topological Branching Fractions of the τ Lepton

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    This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.55.570We report new and precise measurements of the decay branching fractions of the τ lepton to one and three charged particles. The data, corresponding to an integrated luminosity of 176 pb(−1), were collected by the high resolution spectrometer HRS at the e(+)e(−) storage ring PEP at SLAC operated at s√=29 GeV. The fractions of τ decays into one and three charged particles are 0.869±0.002±0.003 and 0.130±0.002±0.003, respectively

    Search for the production of fractionally charged particles in e(+)e(−) annihilations at s√=10.5 GeV

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.40.263

    Search for φ mesons in τ lepton decay

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.55.R1119

    Limit on τ decay to seven charged particles

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.35.2269

    Measurement of the τ-lepton mass

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.47.R3671

    Production of η and ω mesons in τ decay and a search for second-class currents

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    This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.59.1993

    Search for a neutral Higgs boson in B-meson decay

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.40.712.Using the CLEO detector at the Cornell Electron Storage Ring we have searched for neutral-Higgs-boson production in B decay, both through the exclusive modes B→H(0)K and B→H(0)K∗ using the decay of the H(0) into a pair of muons, pions, or kaons, and through the inclusive decay B→H(0)X using only the muon decay of the H(0). We find no evidence for a Higgs boson with a mass between 2m(μ) and 2m(τ)

    Production cross section and topological decay branching fractions of the τ lepton

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    This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.40.902.We report new measurements of the production cross section for the reaction e(+)e(−)→τ(+)τ(−) at s√=29 GeV, as well as the topological decay branching fractions of the τ lepton. The data were taken with the High Resolution Spectrometer at the SLAC e(+)e(−) colliding-beam facility PEP. The measured cross section yields Rττ=1.044±0.014±0.030 [where the first (second) error is statistical (systematic)], consistent with QED and corresponding to QED cutoff parameters of Λ+>129 GeV and Λ−>284 GeV at the 95% C.L. The fractions of τ decays into one and three charged particles are B1=0.864±0.003±0.003 and B3=0.135±0.003±0.003
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