77 Result(s)
within
E. K. Johansson
English
-
Article
Investigation of Colour Reconnection in WW events with the DELPHI detector at LEP-2
In the reaction e+e-→WW→(q1q̄2)(q3q̄4) the usual hadronization models treat the colour singlets q1q̄2 and q3q̄4 coming from two W bosons independently. However, since the final state partons may coexist in space ...
-
Article
Search for a fourth generation b’-quark at LEP-II at \(\sqrt{s}=\,\) 196–209 GeV
A search for the pair production of fourth generation b’-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging from 196 to ...
-
Article
γ-ray spectroscopy of excited states in 61 30Zn31
The 61 30Zn31 isotope has been produced at the Oak Ridge National Laboratory in the fusion-evaporation reaction 40Ca(24Mg, 2pn)61Zn at 104MeV. The experimental set-up allowed γ-rays to be detected...
-
Article
Search for neutral MSSM Higgs bosons at LEP
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric standard model (MSSM). The data of the four collaborations ...
-
Article
Evidence for an excess of soft photons in hadronic decays of Z0
Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qq̄ disintegrations of the Z0 were studied in the kinematic range 0.2<Eγ<1 GeV and transverse momentum with respe...
-
Article
Gamma-ray spectroscopy of the doubly magic nucleus 56Ni
The doubly magic N = Z nucleus 56Ni has been investigated with two fusion-evaporation reactions; 40Ca(28Si, 3α)56Ni at a beam energy of 122MeV and 28Si(32S, 2p2n)56Ni at 130MeV. To detect γ-rays in coincidence wi...
-
Article
News on mirror nuclei in the sd and fp shells
Novel experimental results on mirror nuclei in the sd and fp shells are presented. Their respective Mirror Energy Difference (MED) diagrams are interpreted by means of large-scale shell-model calculations. A uniq...
-
Chapter and Conference Paper
News on mirror nuclei in the sd and fp shells
Novel experimental results on mirror nuclei in the sd and fp shells are presented. Their respective Mirror Energy Difference (MED) diagrams are interpreted by means of large-scale shell-model calculations. A uniq...
-
Article
Search for pair-produced neutralinos in events with photons and missing energy from e+e- collisions at \(\sqrt s = 130 - 183\) GeV
The events with two photons and missing (transverse) energy collected by the DELPHI detector at centre-of-mass energies between 130 GeV and 183 GeV have been studied to search for processes of the type e+e- → YY ...
-
Article
Search for scalar fermions and long-lived scalar leptons at centre-of-mass energies of 130 GeV to 172 GeV
Data taken by DELPHI during the 1995 and 1996 LEP runs have been used to search for the supersymmetric partners of electron, muon and tau leptons and of top and bottom quarks. The observations are in agreement...
-
Article
Search for charginos, neutralinos and gravitinos at LEP
An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with...
-
Article
Determination of |Vcb| from the semileptonic decay B0 → D*−ℓ+ ν
Semileptonic decays B→ D*− ℓ + νX were selected from a sample of 3.1 million hadronic Z decays collected by the DELPHI detector at LEP. A topological search for sem...
-
Article
Search for high massγγ resonances in \(e^ + e^ - \to \ell ^ + \ell ^ - \gamma \gamma \) , \(\nu \bar \nu \gamma \gamma \) and \(q\bar q\gamma \gamma \) at LEP Iat LEP I
A search for high mass photon pairs from the processes \(e^ + e^ - \to \ell ^ + \ell ^ - \gamma \gamma \) , ...
-
Article
Study of rareb decays with the DELPHI detector at LEP
Rare decays of beauty particles were studied in several charmless modes using the data collected with the DELPHI detector at LEP from 1991 to 1994. These decays are mediated by both tree levelb→u and one-loop pen...
-
Article
Determination of the average lifetime ofb-baryons
The average lifetime ofb-baryons has been studied using 3×106 hadronicZ 0 decays collected by the DELPHI detector at LEP. Three methods have been used, based on the measurement of different observ...
-
Article
Measurement of the B d 0 oscillation frequency using kaons, leptons and jet charge
A measurement of the mass difference,Δm d , between the two physical B d 0 ...
-
Article
Mean lifetime of theB s 0 meson
This paper presents an update of the measurement of the mean lifetime of theB s 0 meson. CombiningD ...
-
Article
First study of the interference between initial and final state radiation at the Z resonance
The interference between initial and final state radiation in the processe + e −→μ + μ − at √s≈MZ has been studied b...
-
Article
A measurement of the photon structure functionF 2 γ at an averageQ 2 of 12 GeV2/c 4
The hadronic photon structure functionF 2 γ has been measured in theQ 2 range from 4 to 30 GeV2/c ...
-
Article
Search for promptly produced heavy quarkonium states in hadronic Z decays
A search has been made for direct production of heavy quarkonium states in more than 3 million hadronicZ 0 decays in the 1991–1994 DELPHI data. PromptJ/ψ, ψ(2S) andΓ candidates have been searched ...
