Showing papers by "N. I. Zimin published in 1998"
TL;DR: In this article, an excess of 66±14 (stat.) events were observed in the D∗+π+π−π− final state with a mass of 2637±2(stat.)±6(syst.) MeV/c2 and a full width smaller than 15 MeV /c2 (95% C.L.).
42 citations
TL;DR: In this paper, 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.
Abstract: 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 mass above 300 GeV/c2 and a mass difference between the chargino and the lightest neutralino above 10 GeV/c2, the lower limit at 95% confidence level on the chargino mass ranges from 84.3 GeV/c2 to the kinematical limit (86.0 GeV/c2), depending on the mixing parameters. The limit decreases for lower chargino-neutralino mass differences. The limit in the case of a light sneutrino is 67.6 GeV/c2, provided that that there is no light sneutrino with a mass within 10 GeV/c2 below the chargino mass. Upper limits on neutralino pair production cross-sections of about a picobarn are derived. The (μ,M2) domain excluded in the MSSM-GUT scenario is determined by combining the neutralino and chargino searches. These results imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c2 for tans >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino. imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c2 for tans >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino.
40 citations
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TL;DR: The value of the b quark mass at the M Z scale defined in the MS renormalization scheme was determined using 2.8 million hadronic Z decays collected during 1992-1994 by the DELPHI detector to be m b (M Z )=2.67±0.25 ( stat. )± 0.34 ( frag. )−0.27 ( theo. ) GeV/c 2 ).
40 citations
TL;DR: In this paper, the total and the differential cross sections for the reaction e+e− → γγ(γ) have been measured with the DELPHI detector at LEP using an integrated luminosity of 36.9 pb−1.
34 citations
TL;DR: In this article, the authors measured trilinear gauge boson couplings using data taken by DELPHI at 161 GeV and 172 GeV, and derived limits on neutral ZVγ couplings from an analysis of the reaction.
32 citations
TL;DR: In this paper, the invariant mass of the lepton lepton to three charged particles was studied using data collected by the DELPHI detector at LEP between 1992 and 1995.
23 citations
TL;DR: The average multiplicity of charged particles in hadronic W decays has been measured for the first time; its value, $19.23 \pm 0.74 (stat+syst)$, is consistent with that expected for an $e^+e^-$ interaction at a centre-of-mass energy equal to the W mass as mentioned in this paper.
14 citations
TL;DR: In this paper, a multihadronic event recorded at LEP by DELPHI in the years 1992 through 1994, charged hadrons are identified using the measurement of their energy loss and their Cherenkov angle.
9 citations
TL;DR: In this paper, the authors presented results on charged Higgs boson production, based on LEP data collected at √s = 172 GeV, that complement the previous DELPHI results obtained at centre of mass energies up to 161 GeV.
9 citations
TL;DR: The DELPHI experiment at LEP has measured the inclusive charmless B hadron decay branching ratio, the B branching ratio into two charmed particles, and the total number of charmed particle per B decay, using the hadronic Z data taken between 1992 and 1995 as discussed by the authors.
8 citations