2,586 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
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
This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.41.774
Production cross section and topological decay branching fractions of the Ï„ lepton
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
Study of π(+)π(−) transitions from the Υ(3S) and a search for the hb
This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.43.1448
Measurement of the cross section for γγ→pp¯
This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.50.5484.A measurement of the cross section for γγ→pp¯ is performed at two-photon center-of-mass energies between 2.00 and 3.25 GeV. These results are obtained using e(+)e-→e(+)e-pp¯ events selected from 1.31 fb(-1) of data taken with the CLEO II detector. The measured cross section is in reasonable agreement with previous measurements and is in excellent agreement with recent calculations based on a diquark model. However, leading order QCD calculations performed using the Brodsky-Lepage formalism are well below the measured cross section
Measurement of the Topological Branching Fractions of the Ï„ Lepton
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
Production of η and ω mesons in τ decay and a search for second-class currents
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
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)
Search for the production of fractionally charged particles in e(+)e(−) annihilations at s√=10.5 GeV
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
This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.55.R1119
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