author = "Abreu, P"

Found 738 documents, displaying page 1 of 74

Charged and Identified Particles in the Hadronic Decay of W Bosons and in e+e- -> q qbar from 130 to 200 GeV

Author(s) : Abreu, P.
Description : Inclusive distributions of charged particles in hadronic W decays are experimentally investigated using the statistics collected by the DELPHI experiment at LEP during 1997, 1998 and 1999, at centre-of-mass energies from 183 to around 200 GeV. The possible effects of interconnection between the ha...
Repository : arXiv
Language(s) : Undetermined

A Search for $\eta'_c$ Production in Photon-Photon Fusion at LEP

Author(s) : Abreu, P.
Description : A search for the production of the $\eta'_c$ meson, the first radial excitation of the ground state of charmonium $\eta_c$(2980), in the photon-photon fusion reaction at LEP has been performed using the data collected by the DELPHI detector during 1992-1996. No evidence of $\eta'_c$ production is ...
Repository : arXiv
Language(s) : Undetermined

Colour Reconnection at LEPII

Author(s) : Abreu, P.
Description : The preliminary results on the search of colour reconnection effects (CR) from the four experiments at LEP, Aleph, Delphi, L3 and Opal, are reviewed. Extreme models are excluded by studies of standard variables, and on going studies of a method first suggested by L3, the particle flow method, are ...
Repository : arXiv
Language(s) : Undetermined

Search for neutralino pair production at sqrt(s) = 189 GeV

Description : A search for pair-production of neutralinos at a LEP centre-of-mass energy of 189 GeV gave no evidence for a signal. This limits the neutralino production cross-section and excludes regions in the parameter space of the Minimal Supersymmetric Standard Model (MSSM).
Repository : UCL Eprints
Language(s) : Undetermined

Consistent Measurements of alpha_s from Precise Oriented Event Shape Distributions

Description : An updated analysis using about 1.5 million events recorded at $\sqrt{s} = M_Z$ with the DELPHI detector in 1994 is presented. Eighteen infrared and collinear safe event shape observables are measured as a function of the polar angle of the thrust axis. The data are compared to theoretical calculati...
Repository : UCL Eprints
Language(s) : Undetermined

Measurement of the ZZ cross-section in e+e- interactions at 183-189 GeV

Description : Measurements of on-shell ZZ production are described, using data collected by DELPHI in 1997 and 1998, at centre-of-mass energies sqrt(s) = 182.6 GeV and 188.6 GeV respectively. Results obtained in each of the final states q qbar q qbar, mu+mu- q qbar, e+e- q qbar, nu nubar q qbar, l+l-l+l-, and nu ...
Repository : UCL Eprints
Language(s) : Undetermined

Search for the Standard Model Higgs boson at LEP in the year 2000

Description : 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 k...
Repository : UCL Eprints
Language(s) : Undetermined

Measurement of Trilinear Gauge Boson Couplings WWV, (V = Z,gamma) in e+e- Collisions at 189 GeV

Description : Measurements of the trilinear gauge boson couplings WWgamma and WWZ are presented using the data taken by DELPHI in 1998 at a centre-of-mass energy of 189 GeV and combined with DELPHI data at 183 GeV. Values are determined for Delta(g_1^Z) and Delta(kappa_gamma), the differences of the WWZ charge co...
Repository : UCL Eprints
Language(s) : Undetermined

Search for the sgoldstino at sqrt(s) from 189 to 202 GeV

Description : A search for the supersymmetric partner of the goldstino, the sgoldstino S, at LEP2 is presented. 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. No evidence for the S production was found and limits on the S mas...
Repository : UCL Eprints
Language(s) : Undetermined

Update of the search for supersymmetric particles in scenarios with Gravitino LSP and Sleptons NLSP

Description : An update of the search for sleptons, neutralinos and charginos in the context of scenarios where the lightest supersymmetric particle is the gravitino and the next-to-lightest supersymmetric particle is a slepton, is presented, together with the update of the search for heavy stable charged particl...
Repository : UCL Eprints
Language(s) : Undetermined

Found 738 documents, displaying page 1 of 74