Showing papers by "L. Di Ciaccio published in 2000"
TL;DR: In this article, an analysis of the data collected in 1997 and 1998 with the DELPHI detector at e+e- collision energies close to 183 and 189 GeV was performed in order to extract the hadronic and leptonic fermion-pair cross-sections, as well as the leptononic forward-backward asymmetries and angular distributions.
45 citations
TL;DR: In this paper, the mass of charginos, neutralinos and sleptons at LEP2 center-of-mass energies from 130 GeV to 189 GeV have been used to set lower limits on the masses of the Lightest Supersymmetric Particle and other supersymmetric particles within the MSSM framework.
13 citations
27 Jul 2000
TL;DR: In this article, the results on b-hadron lifetimes, bhadron production rates, B{sub d}{sup 0}-{bar B}{sub d} and b{sub s}{sub s} oscillations, the decay width difference between the mass eigenstates of the B {sub s-sup 0}.
Abstract: Combined results on b-hadron lifetimes, b-hadron production rates, B{sub d}{sup 0}-{bar B}{sub d}{sup 0} and B{sub s}{sup 0}-{bar B}{sub s}{sup 0} oscillations, the decay width difference between the mass eigenstates of the B{sub s}{sup 0}-{bar B}{sub s}{sup 0} system, the average number of c and {bar c} quarks in b-hadron decays, and searches for CP violation in the B{sub d}{sup 0}-{bar B}{sub d}{sup 0} system are presented. They have been obtained from published and preliminary measurements available in Summer 2000 from the ALEPH, CDF, DELPHI, L3, OPAL and SLD Collaborations. These results have been used to determine the parameters of the CKM unitarity triangle.
12 citations
TL;DR: In this paper, a test of the QED process e+e- → γγ(γ) is reported, and the data analysed were collected with the DELPHI detector in 1998 and 1999 at the highest energies achieved at LEP, reaching 202 GeV in the centre-of-mass.
9 citations
TL;DR: In this paper, a search for the supersymmetric partner of the goldstino, the sgoldstino S, at LEP2 was presented, and the production Sgamma followed by S decay into two gluons or into two photons was studied at 189 - 202 GeV LEP centre-of-mass energies.
6 citations
01 Jan 2000
TL;DR: In this article, the DELPHI results were combined with the results of the Hadronic and muon pair final states of the hadronic and hadronic pair of the d {\mbox{$ {\mathrm Z} $}} d boson to obtain a 95% confidence level upper bound on the cross-section and the corresponding Higgs boson mass lower limit.
Abstract: Searches for {\mbox{$ {\mathrm H} {\mathrm Z} $}} production d with the Higgs boson decaying into an invisible final state have been performedd the data collected by the DELPHI experimentd up to the centre-of-mass energy of 188.6~{\mbox{$ {\mathrm{GeV}}$}}. d The hadronic and muon pair final states of the d {\mbox{$ {\mathrm Z} $}} d boson were analysed. No signal was found. d Upper limits on the cross-section and the corresponding Higgs boson mass d limits were set d at 95\% confidence level. Combining these results with DELPHI results for the vd a 95\% confidence level Higgs mass lower limit of 92.3~{\mbox{$d {\mathrm{GeV}}$}} was obtained, independentd of the branching ratio into visible and invisible decays.
2 citations