77 Result(s)
within
E. K. Johansson
English
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Article
Search for low mass Higgs bosons produced inZ 0 decays
A search for light Higgs bosons was performed using the data sample collected in 1990 by the DELPHI detector at LEP, at centre of mass energies between 88.2 and 94.2 GeV. Using the process e+e−→H 0+Z 0*,Z 0*→ff, ...
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Article
Charged particle multiplicity distributions in restricted rapidity intervals inZ 0 hadronic decays
The multiplicity distributions of charged particles in restricted rapidity intervals inZ 0 hadronic decays measured by the DELPHI detector are presented. The data reveal a shoulder structure, best visible for int...
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Article
Charged particle multiplicity distributions inZ 0 hadronic decays
This paper presents an analysis of the multiplicity distributions of charged particles produced inZ 0 hadronic decays in the DELPHI detector. It is based on a sample of 25364 events. The average multiplicity is <
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Article
Search for excited charged leptons inZ 0 decays
Using a data sample of 115000 hadronicZ 0 decays, a search was performed for the production of excited charged leptons decaying into an ordinary lepton and one photon. Pair production of excited leptons of mass b...
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Article
Measurement of the partial width of theZ 0 intob \(\bar b\) final states using their semi-leptonic decays
The spectra of prompt electrons and muons from the semi-leptonic decays of heavy hadrons produced inZ 0 decays have been used to measure the coupling of theZ 0 tob quarks weighted by theB hadrons mean semi-lepton...
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Article
Charged particle multiplicity distributions for fixed number of jets inZ 0 hadronic decays
The multiplicity distributions of charged particles in full phase space and in restricted rapidity intervals for events with a fixed number of jets measured by the DELPHI detector are presented. The data are w...
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Article
Determination of 55-155-155-1in second order QCD from hadronicZ decays
Distributions of event shape variables obtained from 120600 hadronicZ decays measured with the DELPHI detector are compared to the predictions of QCD based event generators. Values of the strong coupling constant...
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Article
Functional and dispositional tolerance develops during continuous cocaine exposure
Despite the fact that high doses of cocaine are abused chronically, relatively little is known regarding the development of tolerance and/or sensitization under these circumstances. Therefore, male Sprague-Daw...
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Article
Measurement of the average lifetime ofB hadrons
The average lifetime ofB hadrons produced in hadronicZ 0 decays has been measured with the DELPHI detector at LEP. The measurement is based on the analysis of the impact parameter distributions of highp ...
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Article
A study of the decays of tau leptons produced on theZ resonance at LEP
From the analysis of a data sample corresponding to an integrated luminosity of 4.63 pb−1 taken during the 1990 run of LEP at centre of mass energies between 88.2 GeV an 94.2 GeV, the tau decays ...
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Article
Study of final state photons in hadronicZ 0 decay and limits on new phenomena
The differential cross section for final state radiation from primary quarks is obtained from a study of isolated energetic photons produced in the reactione + e −→Z 0→hadrons+γ, as measured in the DELPHI detecto...
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Article
Determination ofα s using the next-to-leading-log approximation of QCD
A new measurement of αs is obtained from the distributions in thrust, heavy jet mass, energy-energy correlation and two recently introduced jet broadening variables following a method proposed by Catani, Trentadu...
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Article
A measurement ofB meson production and lifetime usingDl − events inZ 0 decays
A study ofB meson decays intoDl X final states is presented. In these events, neutral and chargedD mesons originate predominantly fromB + andB 0 decays, respectively. The dilution of this correlation due toD ** p...
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Article
Measurement of the triple-gluon vertex from 4-jet events at LEP
From the combined data of 1990 and 1991 of the DELPHI experiment at LEP, 13057 4-jet events are obtained and used for determining the contribution of the triple-gluon vertex. The relevant variables are the gen...
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Article
A measurement ofD meson production inZ 0 hadronic decays
A study of the fragmentation properties of charm and bottom quarks intoD mesons is presented. From 263 700Z 0 hadronic decays collected in 1991 with the DELPHI detector at the LEP collider,D 0,D + andD *+ are rec...
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Article
A precision measurement of the average lifetime ofB hadrons
The average lifetime ofB hadrons was measured using data collected with the DELPHI detector at the LEP collider during 1991 and 1992. The measurement was performed using two different anayses. The first method wa...
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Article
Invariant mass dependence of particle correlations in hadronic final states from the decay of theZ 0
Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign pions. Strong correlations are observed only at small masses. The correlations decrease very rapidly for like-si...
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Article
Search for pair-produced heavy scalars in Z0 decays
A search for charged Higgs bosons decaying into quarks is described, based on statistics of around 1.7 million hadronic Zo decays detected in DELPHI. Despite the very high background from standard hadronic decays...
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Article
Study of hard scattering processes in multihadron production from γγ collisions at LEP
The production of multihadronic states in γγ collisions at LEP has been studied with the DELPHI detector. The analyzed data correspond to an integrated luminosity of about 32pb−1, collected in the LEP runs of 199...
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Article
Production rate and decay lifetime measurements ofB s 0 mesons at LEP usingD s andϕ mesons
The study of the properties of inclusive production ofD s mesons and of events in which a ϕ and a muon are present in the same jet provides two independent measurements of the ...
