Searches for the Standard Model Higgs boson have been performed in the data collected by the DELPHI experiment at LEP in the year 2000 at centre-of-mass energies between 200 and 209 GeV corresponding ...to a total integrated luminosity of 224 pb
−1. No evidence for a Higgs signal is observed in the kinematically accessible mass range, and a 95% CL lower mass limit of 114.3 GeV/
c
2 is set, to be compared with an expected median limit of 113.5 GeV/
c
2 for these data.
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 leptonic forward–backward asymmetries and angular distributions. The data are used to put limit on contact interactions between fermions, the exchange of R-parity violating SUSY sneutrinos, Z′ bosons and the existence of gravity in extra dimensions.
Infrared and collinear safe event shape distributions and their mean values are determined using the data taken at five different centre of mass energies above M-Z with the DELPHI detector at LEP. ...From the event shapes, the strong coupling alpha(s) is ext
A sample of 2.2 million hadronic Z decays, selected from the data recorded by the Delphi detector at Lep during 1994–1995 was used for an improved measurement of inclusive distributions of \(\pi^+, ...K^+\) and p and their antiparticles in gluon and quark jets. The production spectra of the individual identified particles were found to be softer in gluon jets compared to quark jets, with a higher multiplicity in gluon jets as observed for inclusive charged particles. A significant proton enhancement in gluon jets is observed indicating that baryon production proceeds directly from colour objects. The maxima, \(\xi^*\), of the \(\xi\)-distributions for kaons in gluon and quark jets are observed to be different.
During 1993 and 1995 LEP was run at 3 energies near the Z\(^0\) peak in order to give improved measurements of the mass and width of the resonance. During 1994, LEP operated only at the Z\(^0\) peak. ...In total DELPHI accumulated data corresponding to an integrated luminosity of approximately 116 pb\(^{-1}\). Analyses of the hadronic cross-sections and of the cross-sections and forward-backward asymmetries in the leptonic channels used the most precise evaluations of the LEP energies. In the dimuon channel, events with a photon radiated from the initial state have been used to probe the cross-sections and asymmetries down to PETRA energies. Model independent fits to all DELPHI lineshape and asymmetry data from 1990 to 1995 have been carried out giving values of the resonance parameters:These values are significantly more precise than those previously published. The results are interpreted in terms of the Standard Model.
The study of the directional dependence of two-particle correlations in the hadronic decays of the Z(0) boson is performed using the data collected by the DELPHI experiment in the 1992-1995 running ...periods. The comparison between the transverse, R-perpend
The production of single photons has been studied in the reaction e(+)e(-) --> gamma +invisible particles at centre-of-mass energies of 183 GeV and 189 GeV. A previously published analysis of ...events with multiphoton final states accompanied by missing ene
Lifetime and oscillations of B-s(0) mesons have been studied in events with a large transverse momentum lepton and a D-s of opposite electric charge in the same hemisphere, selected from about 3.6 ...million hadronic Z(0) decays accumulated by DELPHI between
The ratio of the CKM quark-mixing matrix elements \V-ub\/\V-cb\ has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M-X of the secondary hadronic system ...produced in association with an identified lepton. Since B
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