76 research outputs found

    Electroweak parameters of the z0 resonance and the standard model

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    CHARGED-PARTICLE MULTIPLICITY DISTRIBUTIONS FOR FIXED NUMBER OF JETS IN Z0 HADRONIC DECAYS

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    MEASUREMENT OF THE GAMMA(B-B-OVER-BAR)/GAMMA(HAD) BRANCHING RATIO OF THE Z BY DOUBLE HEMISPHERE TAGGING

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    Two measurements of Gamma(b ()overbarb)/Gamma(had)arepresented.Bothmeasurementsuse250000ZdecaystakenwiththeDELPHIdetectorin1991andrelymainlyontheprecisionofthemicrovertexdetector.Onetaggingmethodisassimpleaspossiblesothatbackgroundratescanbereliablypredictedbysimulation.Theotheroneusesamoreinvolvedtaggingtechniqueandreducesthedependenceonsimulationasmuchaspossible.Combiningbothresults,Gamma(b() over bar b)/Gamma(had) are presented. Both measurements use 250000 Z decays taken with the DELPHI detector in 1991 and rely mainly on the precision of the microvertex detector. One tagging method is as simple as possible so that background rates can be reliably predicted by simulation. The other one uses a more involved tagging technique and reduces the dependence on simulation as much as possible. Combining both results, Gamma(b () over bar b)/Gamma(had) is found to be 0.2209 +/- 0.0041 (stat.) +/- 0.0042(syst.) +/- 0.0018 (Gamma(c ($) over bar c))

    Production of charged particles, KS0, K±, p and Λ in Z → bb̄ events and in the decay of b hadrons

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    Measurement of time dependent Bd0-BÌ„d0 mixing

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