| 1. |
- Abreu, P., et al.
(author)
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Search for sleptons in e+e- collisions at √s = 183 to 189 GeV
- 2001
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In: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 19:1, s. 29-42
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Journal article (peer-reviewed)abstract
- Data taken by the DELPHI experiment at centre-of-mass energies of 183 GeV and 189 GeV with a total integrated luminosity of 212 pb-1 have been used to search for the supersymmetric partners of the electrons, muons, and taus in the context of the Minimal Supersymmetric Standard Model (MSSM). The decay topologies searched for were the direct decay (ℓ̃ → ℓx̃), producing acoplanar lepton pairs plus missing energy, and the cascade decay (ℓ → ℓx̃0 2 → ℓγx̃0 1), producing acoplanar lepton and photon pairs plus missing energy. The observed number of events is in agreement with Standard Model predictions. The 95% CL excluded mass limits for selectrons, smuons and staus are mẽ ≤ 87 GeV/c2, mμ̃ ≤ 80 GeV/c2 and mτ̃ 75 GeV/c2, respectively, for values of μ=-200 GeV/c2 and tanβ=1.5.
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| 2. |
- Abreu, P., et al.
(author)
-
Study of dimuon production in photon-photon collisions and measurement of QED photon structure functions at LEP
- 2001
-
In: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 19:1, s. 15-28
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Journal article (peer-reviewed)abstract
- Muon pair production in the process e+e- → e+e- μ+μ- is studied using the data taken at LEP1 (√s ≃ mz) 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 Q2 range accessible at LEP1 (from several GeV2/c4 to several hundred GeV2/c4) 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 Fγ 2. Azimuthal correlations are used to obtain information on additional structure functions, Fγ A and Fγ B, which originate from interference terms of the scattering amplitudes. The measured ratios Fγ A/Fγ 2 and FγB/Fγ 2 are significantly different from zero and consistent with QED predictions.
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| 3. |
- Abreu, P, et al.
(author)
-
A measurement of the Tau topological branching ratios
- 2001
-
In: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER-VERLAG. - 1434-6044. ; 20:4, s. 617-637
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Journal article (peer-reviewed)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)(-)
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| 4. |
- Abreu, P, et al.
(author)
-
Measurement of the mass and width of the W boson in e(+)e(-) collisions at root s=189 GeV
- 2001
-
In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 511:2-4, s. 159-177
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Journal article (peer-reviewed)abstract
- A measurement of the FV mass and width has been performed by the DELPHI Collaboration using the data collected during 1998. The data sample has an integrated luminosity of 155 pb(-1) and an average centre-of-mass energy of 188.6 GeV. Results are obtained
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| 5. |
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| 6. |
- Abreu, P, et al.
(author)
-
Search for a fermiophobic Higgs at LEP 2
- 2001
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In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 507:1-4, s. 89-103
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Journal article (peer-reviewed)abstract
- Higgs bosons predicted by the fermiophobic scenario within Two Higgs Doublers Models were searched for in the data collected by the DELPHI detector at centre-of-mass energies between 189 GeV and 202 GeV, corresponding to a total integrated luminosity of 3
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| 7. |
- Abreu, P, et al.
(author)
-
Search for neutralino pair production at root s = 189 GeV
- 2001
-
In: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER-VERLAG. - 1434-6044. ; 19:2, s. 201-212
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Journal article (peer-reviewed)abstract
- 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 Mod
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| 8. |
- Abreu, P, et al.
(author)
-
Search for sleptons in e(+)e(-) collisions at root s=183 to 189 GeV
- 2001
-
In: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER-VERLAG. - 1434-6044. ; 19:1, s. 29-42
-
Journal article (peer-reviewed)abstract
- Data taken by the DELPHI experiment at centre-of-mass energies of 183 GeV and 189 GeV with a total integrated luminosity of 212 pb(-1) have been used to search for the supersymmetric partners of the electrons, muons, and taus in the context of the Minimal
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| 9. |
- Abreu, P, et al.
(author)
-
Search for spontaneous R-parity violation at root s=183 GeV and 189 GeV
- 2001
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In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 502:1-4, s. 24-36
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Journal article (peer-reviewed)abstract
- Searches 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 o
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| 10. |
- Abreu, P, et al.
(author)
-
Search for the Standard Model Higgs boson at LEP in the year 2000
- 2001
-
In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 499:1-2, s. 23-37
-
Journal article (peer-reviewed)abstract
- 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 evi
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