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Searches for the neutral Higgs bosons h 0 and A 0 are used to obtain limits on the Type II Two Higgs Doublet Model (2HDM(II)) with no CP–violation in the Higgs sector and no additional particles besides the five Higgs bosons. The analysis combines approximately 170 pb −1 of data collected with the OPAL detector at √ s ≈ 189 GeV with previous runs at √ s ≈ m(More)
The deployment of HEP applications in heterogeneous grid environments can be challenging because many of the applications are dependent on specific OS versions and have a large number of complex software dependencies. Virtual machine monitors such as Xen could be used to package HEP applications, complete with their execution environments, to run on(More)
Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 438 pb −1 at centre-of-mass energies of √ s =192 – 209 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level lower limit on the scalar top quark mass is 97.6 GeV if the mixing angle between the(More)
Two measurements of fragmentation functions at the Belle detector are presented. A data sample of about 105 fb −1 was used to determine precisely the charm fragmentation functions of c → D + , D 0 , D * + , D * 0 , D + s and Λ + c. A second analysis based on a data sample of xx fb −1 was used to determine the so-called Collins fragmentation function, which(More)
We report measurements of branching fractions for charged and neutral B-->eta(c)K decays where the eta(c) meson is reconstructed in the K(0)(S)K+/-pi(-/+), K+K-pi(0), K(*0)K-pi(+), and pp; decay channels. The neutral B0 channel is a CP eigenstate and can be used to measure the CP violation parameter sin(2phi(1). We also report the first observation of the(More)
Bose-Einstein Correlations (BEC) of three identical charged pions were studied in 4 × 10 6 hadronic Z 0 decays recorded with the OPAL detector at LEP. The genuine three-pion correlations, corrected for the Coulomb effect, were separated from the known two-pion correlations by a new subtraction procedure. A significant genuine three-pion BEC enhancement near(More)
A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at √ s = 189–209 GeV, corresponding to an integrated luminosity of approximately 600 pb −1. Charged Higgs bosons are assumed to be pair-produced and to decay into q¯ q, τ ν τ(More)
The process e + e ? ! e + e ? Z== is studied with the OPAL detector at LEP at a centre of mass energy of p s = 189 GeV. The cross-section times the branching ratio of the Z== decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1:2 0:30:1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0:7 0:20:1)(More)