Showing papers by "Manolis Dris published in 1997"
TL;DR: Weak isosinglet neutral heavy leptons (m) have been searched for using data collected by the DELPHI detector corresponding to 3:3 106 hadronic Z0 decays at LEP1.
Abstract: Weak isosinglet Neutral Heavy Leptons (m) have been searched for using data collected by the DELPHI detector corresponding to 3:3 106 hadronic Z0 decays at LEP1. Four separate searches have been performed, for short-lived m production giving monojet or acollinear jet topologies, and for long-lived m giving detectable secondary vertices or calorimeter clusters. No indication of the existence of these particles has been found, leading to an upper limit for the branching ratio BR(Z0 ! m) of about 1:310−6 at 95% confidence level for m masses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the m mass. The results are also interpreted in terms of limits for the single production of excited neutrinos.
337 citations
TL;DR: In this paper, DELPHI accumulated data corresponding to an integrated luminosity of 9.93 pb−1, and observed 29 events that are considered as candidates for W-pair production.
37 citations
TL;DR: The spin density matrix elements for the ϱ0, K∗0(892) and F produced in hadronic Z0 decays are measured in the DELPHI detector as discussed by the authors.
27 citations
TL;DR: In this paper, a search for fully reconstructed Bc± mesons has yielded one View the MathML source candidate, no View-the-MathML source candidates, and one View-The MathML Source, π+π−π± candidate, consistent with expected background in each channel.
21 citations
TL;DR: In this paper, the DELPHI detector at LEP running at a centre-of-mass energy of 172 GeV was used to study the correlation between pions from different W's in e+e− → W+W− events.
20 citations
TL;DR: In this paper, the average multiplicity of $b \bar b$ pairs from gluons, \gb, in hadronic $Z^0$ events collected by the DELPHI experiment at LEP is presented.
19 citations
TL;DR: In this article, the hadronic fragmentation functions of the various quark flavors and of gluons are measured in a study of the inclusive hadron production from Z0 decays with the DELPHI detector and are compared with the fragmentation functions measured elsewhere at energies between 14 GeV and 91 GeV.
13 citations
TL;DR: In this article, a sample of about 1.4 million hadronic Z decays, selected among the data recorded by the DELPHI detector at LEP during 1994, was used to measure for the first time the momentum spectra of K+, K0, p, Λ and their antiparticles in gluon and quark jets.
5 citations
TL;DR: The measurement of the correlation between the transverse spin components of pairs collected during 1992 to 1994 with the DELPHI detector at LEP1 is presented in this article, in agreement with the Standard Model expectation.
4 citations