468 research outputs found
Search for supersymmetry with R-parity violating L L anti-E couplings at S**(1/2) = 183-GeV
No full textSearches for pair production of supersymmetric particles in ee collisions at centre-of-mass energy of 183~GeV have been performed on DELPHI data under the assumption that -parity is not conserved. Only one -parity violating coupling of type, which couples the sleptons to the leptons ( term), is considered to be dominant at a time. Since in models with -parity violation any supersymmetric particle can be the lightest one, searches for charginos, neutralinos, sleptons and squarks have been performed both for direct -parity violating decays and for indirect cascade decays. Morever, it is assumed that the strength of the -parity violating couplings is such that the lifetimes can be neglected. The present study?base=pre
A study of the energy evolution of event shape distributions and their means with the DELPHI detector at LEP
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Adenosine A1 receptor-mediated depression of corticostriatal and thalamostriatal glutamatergic synaptic potentials in vitro
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Search for spontaneous R-parity violation at s**(1/2) = 183-GeV and 189-GeV
No full textSearches for spontaneous R-parity-violating signals at roots = 183 GeV and roots = 189 GeV have been performed using the 1997 and 1998 DELPHI data, under the assumption of R-parity breaking in the third lepton family. The expected topology for the decay of a pair of charginos into two acoplanar taus plus missing energy was investigated and no evidence for a signal was found. The results were used to derive a limit on the chargino mass and to constrain the allowed domains of the MSSM parameter space
Search for SUSY with R-parity violating LL anti-E couplings at s**(1/2) = 189-GeV
No full textSearches for pair production of supersymmetric particles under the assumption that R-parity is not conserved are presented, based on data recorded by the DELPHI detector in 1998 from e+e- collisions at a centre-of-mass energy of 189 GeV. Only one R-parity violating LLĒ term (i.e. one l coupling), which couples scalar leptons to leptons, is considered to be dominant at a time. Moreover, it is assumed that the strength of the R-parity violating couplings is such that the lifetimes can be neglected. The search for pair production of neutralinos, charginos and sleptons has been performed for both direct R-parity violating decays and indirect cascade decays. The results are in agreement with Standard Model expectations, and are used to update the constraints on the MSSM parameter values and the mass limits previously derived at √s =183 GeV. The present 95% C.L. limits on supersymmetric particle masses are: mx∼0 > 30GeV/c2 and mx∼± > 94 GeV/c2; mv∼ > 76.5GeV/c2 (direct and indirect decays); ml∼R > 83GeV/c2 (indirect decay only).0info:eu-repo/semantics/publishe
Search for supersymmetry with R-parity violating LLĒ couplings at √s = 183 GeV
No full textSearches for pair production of supersymmctric particles in e+e- collision at centre-of-mass energy of 183 GeV have been performed on DELPHI data under the assumption that R-parity is not conserved. Only one R-parity violating coupling of λ type, which couples the sleptous to the leptons (LLĒ erm), is considered to be dominant at a time. Since in models with R-parity violation any supersymmetic particlr can be the lightest one, searches for charginos, neutralinos, sleptons and squarks have been perfomed both for direct R-parity violating decays and for indirect cascade decays. Morever, it is assumed that the strength of the R-parity violating couplings is such that the lifetimes can be neglected. The present study of supersymmetric particle pair production is used to exclude domains of the Minimal Supersymmetric Standard Model parameter space previously explored under the assumption of R-parity conservation
QCD Results from the DELPHI Measurements of Event Shape and Inclusive Particle Distributions at
No full textthe highest LEP energie
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