Showing papers by "Manolis Dris published in 2001"
TL;DR: In this paper, a 95% lower mass limit of 114.3 GeV/c2 is set, to be compared with an expected median limit of 113.5 GeV /c2 for these data, and no evidence for a Higgs signal is observed in the kinematically accessible mass range.
80 citations
TL;DR: In this article, the DELPHI detector at centre-of-mass energies between 189 GeV and 202 GeV was used to search for Higgs bosons predicted by the fermiophobic scenario within Two Higgs Doublets Models.
32 citations
TL;DR: In this paper, a measurement of the W mass and width has been performed by the DELPHI collaboration using the data collected during 1998 using the method of direct reconstruction of the mass of W from its decay products in both the W+W- -> lvqq and W+w- -> qqqq channels.
28 citations
TL;DR: In this paper, a new precise measurement of |V_{cb}| and of the branching ratio BR(\bar{B^0} -> D^{*+} \ell^- \bar{
u_\ell}) has been performed using a sample of about 5000 semileptonic decays.
24 citations
TL;DR: In this article, a lower bound on the mass of a point-like interaction of the technicolor particle with the Higgs mechanism was established for all points in the plane of the DELPHI experiment at LEP.
Abstract: Technicolor represents a viable alternative to the Higgs mechanism for generating gauge boson masses. Searches for technicolor particles $\rho_T$ and $\pi_T$ have been performed in the data collected by the DELPHI experiment at LEP at centre-of-mass energies between 192 and 208 GeV corresponding to an integrated luminosity of 452 pb$^{-1}$. Good agreement is observed with the SM expectation in all channels studied. This is translated into an excluded region in the $(M_{\pi_T},M_{\rho_T})$ plane. The $\rho_T$ production is excluded for all $90 M_{\rho_T} 206.7$ GeV/c$^2$. Assuming a point-like interaction of the $\pi_T$ with gauge bosons, an absolute lower limit on the charged $\pi_T$ mass at 95\% CL is set at 79.8 GeV/c$^2$, independently of other parameters of the technicolor model.
14 citations
TL;DR: In this article, pair production of gauginos and squarks in e+e collisions at a centre-of-mass energy of 189 GeV have been performed on data corresponding to an integrated luminosity of 158 pb^{-1} collected by the DELPHI detector at LEP.
12 citations
TL;DR: In this paper, the cross-sections for the production of single charged and neutral intermediate vector bosons were measured using integrated luminosities of 52 pb^{-1} and 154 pb−1} collected by the DELPHI experiment at centre-of-mass energies of 182.6 GeV and 188.6 geV, respectively.
9 citations
01 Jan 2001
TL;DR: In this article, measurements of the inclusive T branching ratios for decay modes containing one, three, or five charged particles have been performed, giving the following results: B-1 equivalent to B T- (particle)(-) greater than or equal to0 pi (0) greater than and equal to 0K(0) v(T) (v(overbar)) = 85.316 +/- 0.049) %; B-3 equivalent to b(T- → 2h(-)h(+) greater than 0π(1)-1.569
Abstract: Using data collected in the DELPHI detector at LEP-1, measurements of the inclusive T branching ratios for decay modes containing one, three, or five charged particles have been performed, giving the following results: B-1 equivalent to B T- (particle)(-) greater than or equal to0 pi (0) greater than or equal to 0K(0) v(T) (v(overbar)) = 85.316 +/- 0.093 +/- 0.049) %; B-3 equivalent to B(T- → 2h(-)h(+) greater than or equal to 0 pi (0) greater than or equal to0 pi (0) greater than or equal to 0K(0)z17) = (14.569 +/- 0.093 +/- 0.048)%; B-5 equivalent to B(T- → 3h(-)2h(+) greater than or equal to 0 pi (0) greater than or equal to 0K0(0)v(T)) = (0.115 +/- 0.013 +/- 0.006)%, where h is either a charged pi or K meson. The first quoted uncertainties are statistical and the second systematic.
9 citations
TL;DR: In this paper, the authors measured cross-sections for on-shell ZZ production via the tree-level doubly-resonant graphs (NC02) are: sigma-NC02}(182.6 GeV) = 0.38 +- 0.18 (stat) + 0.04 (syst) pb.
7 citations
TL;DR: In this article, the expected topology for the decay of a pair of charginos into two acoplanar taus plus missing energy was investigated, and the results were used to derive a limit on the chargino mass and to constrain the allowed domains of the MSSM parameter sp.
7 citations
TL;DR: In this paper, the authors used selected events to extract the leptonic photon structure function and Azimuthal correlations were used to obtain information on additional structure functions, which originate from interference terms of the scattering amplitudes.
Abstract: Muon pair production in the process $e^+e^-\to e^+e^-\mu^+\mu^-$ is studied using the data taken at LEP1 ($\sqrt{s}\simeq m_Z$) with the DELPHI detector during the years 1992-1995. The corresponding integrated luminosity is 138.5~pb$^{-1}$. The QED predictions have been tested over the whole $Q^2$ range accessible at LEP1 (from several GeV$^2/c^4$ to several hundred GeV$^2/c^4$) by comparing experimental distributions with distributions resulting from Monte Carlo simulations using various generators. Selected events are used to extract the leptonic photon structure function $F_2^\gamma$. Azimuthal correlations are used to obtain information on additional structure functions, $F_A^\gamma$ and $F_B^\gamma$, which originate from interference terms of the scattering amplitudes. The measured ratios $F_A^\gamma/F_2^\gamma$ and $F_B^\gamma/F_2^\gamma$ are significantly different from zero and consistent with QED predictions.
TL;DR: In this paper, 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 super-particle is a slepton is presented, together with the update of search for heavy stable charged particles in light graviton scenarios and Minimal Supersymmetric Standard Models.