93 Result(s)
within
I. J. Bloodworth
Elementary Particles, Quantum Field Theory
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Article
Search for higher twists in meson resonance production in π− N interactions atPT≥2 GeV/c
We study the production of meson resonance atpT≥2 GeV/c inπ − Be interactions at two beam energies (150 and 300 GeV/c). The motivation is to look for the higher twist (HT) production mecha...
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Article
Investigation of the string effect using final state photons
The string effect in QCD is investigated using data from the OPAL detector at LEP. By comparing the charged particle flow in three-jet multihadronic events with that in events with two jets and a hard isolated...
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Article
Measurement of the τ−→h − h + h − v τ and τ−→h − h + h −≥1π0 v τ branching ratios
The branching ratios of the τ−→h − h + h − v τ and τ−→h − h + h −≥1π0 v τ decays, whereh is either a charged π orK meson, are measured using a data sample of 87861 τ+τ− pairs collected with the OPAL detector at L...
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Article
A study of B meson oscillations using dilepton events
The time dependence of B meson oscillations is studied using hadronic Z0 decays with identified leptons in both thrust hemispheres. Decay times are reconstructed for each of the semileptonic B decays by forming v...
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Article
A measurement of the QCD colour factor ratiosC A /C F andT F /C F from angular correlations in four-jet events
From 1 105 045 hadronic Z0 decays observed with the OPAL detector at the LEP e+e− collider, 21 732 four-jet events are selected. A simultaneous fit of three selected angular variables from these events by the sec...
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Article
Improved measurements of the B0 and B+ meson lifetimes
Updated measurements of the B0 and B+ meson lifetimes are presented. From a data sample of 1.72 million hadronic Z0 decays recorded during the period 1991 to 1993, a sample of approximately 1000 semileptonic B me...
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Article
A measurement of the forward-backward asymmetry of e+e−→bb by applying a jet charge algorithm to lifetime tagged events
The forward-backward asymmetry of \(e^ + e^ - \to Z^0 \to b\bar b\) has been measured using approximately 2.15 m...
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Article
The production of neutral kaons in Z0 decays and their Bose-Einstein correlations
The production of neutral kaons in e+e− annihilation at centre-of-mass energies in the region of the Z0 mass and their Bose-Einstein correlations are investigated with the OPAL detector at LEP. A total of about 1...
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Article
A model independent measurement of quark and gluon jet properties and differences
Three jet events are selected from hadronic Z0 decays with a symmetry such that the two lower energy jets are produced with the same energy and in the same jet environment. In some of the events, a displaced seco...
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Article
Determination of an upper limit for the mass of the τ-neutrino at LEP
An upper limit for theν τ mass is determined through the kinematic reconstruction of the decayτ→5π ± ν τ in the OPAL detector at LEP. The li...
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Article
Search for heavy charged particles and for particles with anomalous charge in e+e− collisions at LEP
Using the OPAL data accumulated in 1991–1993 amounting to 74 pb−1 of integrated luminosity, corresponding to 1.64×106 selected multi-hadronic events, a search has been performed for charged particles with unusual...
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Article
Measurement of the longitudinal, transverse and asymmetry fragmentation functions at LEP
The fragmentation function for the process e+e−→h+X, whereh represents a hadron, may be decomposed into transverse, longitudinal and asymmetric contributions by analysis of the distribution of polar production an...
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Article
Observations of π-B charge-flavor correlations and resonant Bπ and BK production
Evidence is presented for kinematic and charge correlations of B mesons with charged pions and kaons. Using a new technique, a sample of over 80 000 partially reconstructed B mesons is obtained in 3.5·106 hadroni...
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Article
Inclusive strange vector and tensor meson production in hadronic Z0 decays
Measurements have been made in the OPAL experiment at LEP of the inclusive production of strange vector φ(1020) and K*(892)0 mesons, and the tensor meson K 2 *
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Article
Measurement of \(\Gamma (Z^0 \to b\bar b)/\Gamma (Z^0 \to hadrons)\) using a double tagging method
The fraction of \(Z^0 \to b\bar b\) ; events in hadronicZ 0 decays has been measured using the data collected by OPA...
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Article
Measurement of the hadronic decay current in τ−→π− − + v τ
The decay τ−→π− − + v τ has been studied using data collected with the OPAL detector at LEP during 1992 and 1993. The hadronic structure functions for this decay are measured model independently assuming G-parity...
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Article
Measurement of single photon production in e+e− collisions near the Z0 resonance
A measurement of the single photon production cross-section is presented based on a data-sample of 40.5 pb−1 collected with the OPAL detector at centre-of-mass energies within 3 GeV of the Z0 mass. Single photon ...
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Article
Comparisons of the properties of final state photons in hadronic Z0 decays with predictions from matrix element calculations
The properties of hadronic Z0 decays with final state photons, measured with OPAL at LEP, have been compared with predictions from two different matrix element calculations ofO(αα s ...
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Article
A test ofCP-invariance in Z0→τ+τ− using optimal observables
Using 27 490 Z0→τ+τ− decays, accumulated in 1991, 1992 and 1993 with the OPAL detector at LEP, a direct test ofCP-invariance in the neutral current reactione + e −→τ+τ− is performed by measuringCP-odd observables...
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Article
Measurement of the tau lepton polarization and its forward-backward asymmetry from Z0 decays
We report on a measurement of the tau lepton polarization and its forward-backward asymmetry at the Z0 resonance using the OPAL detector. This measurement is based on analyses of the
