Showing papers by "Jalal Abdallah published in 2002"

Searches for neutral Higgs bosons in e(+)e(-), collisions from root s=191.6 to 201.7 GeV

Abstract: Neutral Higgs bosons of the Standard Model ({\sc SM}) and the Minimal Supersymmetric Standard Model ({\sc MSSM}) were searched for in the data collected in 1999 by the DELPHI experiment at centre-of-mass energies between 191.6 and 201.7~GeV with a total integrated luminosity of 228 pb$^{-1}$. These analyses, in combination with our results at lower energies, set 95\% confidence level lower mass bounds on the Standard Model Higgs boson (107.3~GeV/$c^2$) and on the lightest neutral scalar (85.9~GeV/$c^2$) and neutral pseudoscalar (86.5~GeV/$c^2$) Higgs bosons in representative scans of the {\sc MSSM} parameter space. % excluding $\tan\beta$ in the range [0.9-1.6] An extended scan of the {\sc MSSM} parameter space was also performed to test the robustness of these limits.

Search for Charged Higgs Bosons in e+e- Collisions at sqrt(s)=189-202 GeV

Abstract: A search for pair-produced charged Higgs bosons was performed in the high energy data collected by the DELPHI detector at LEP II at centre-of-mass energies from 189 GeV to 202 GeV. The three different final states, \tau u \tau u, c \bar s \bar c s and c \bar s \tau u were considered. New methods were applied to reject wrong hadronic jet pairings and for the tau identification, where a discriminator based on tau polarisation and polar angles was used. No excess of data compared to the expected Standard Model processes was observed and the existence of a charged Higgs boson with mass lower than 71.5 GeV/c^2 is excluded at the 95% confidence level.