| 61. |
- Abreu, P, et al.
(författare)
-
Measurement of the transverse spin correlation in Z->tau(+)tau(-) decays
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 404:1-2, s. 194-206
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The measurement of the correlation between the transverse spin components of tau(+)tau(-) pairs collected during 1992 to 1994 with the DELPHI detector at LEP1 is presented. A value C-TT = 0.87 +/- 0.20 (stat.)(-0.12)(+0.10) (syst.) was obtained for the co
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| 62. |
- Abreu, P, et al.
(författare)
-
Measurement of the triple gluon vertex from double quark tagged 4-jet events
- 1997
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 414:3-4, s. 401-418
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from b- or c-quarks using lifetime and lepton transverse mome
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| 63. |
- Abreu, P, et al.
(författare)
-
Measurement of trilinear gauge couplings in e(+)e(-) collisions at 161 GeV and 172 GeV
- 1998
-
Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 423:1-2, s. 194-206
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Trilinear gauge boson couplings are measured using data taken by DELPHI at 161 GeV and 172 GeV, Values for WWV couplings (V = Z,gamma) are determined from a study of the reactions e(+)e(-) --> W+W- and e(+)e(-) --> We nu, using differential distributions
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| 64. |
- Abreu, P, et al.
(författare)
-
Rapidity correlations in Lambda baryon and proton production in hadronic Z(0) decays
- 1998
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 416:1-2, s. 247-256
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In an analysis of multihadronic events recorded at LEP by DELPHI in the years 1992 through 1994, rapidity correlations of Lambda-Lambda, proton-proton, and Lambda-proton pairs are compared with each other and with the predictions of the string fragmentati
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| 65. |
- Abreu, P, et al.
(författare)
-
Search for charged Higgs bosons in e(+)e(-) collisions at root s = 172 GeV
- 1998
-
Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 420:1-2, s. 140-156
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents results on charged Higgs boson production, based on LEP data collected at root s = 172 GeV, that complement the previous DELPHI results obtained at centre of mass energies up to 161 GeV. The charged Higgs bosons are assumed to be pair
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| 66. |
- Abreu, P, et al.
(författare)
-
Search for charginos, neutralinos and gravitinos at LEP
- 1998
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Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 1:1-2, s. 1-20
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c(2) and a mass difference
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| 67. |
- Abreu, P, et al.
(författare)
-
Search for excited leptons in e(+)e(-) collisions at root s=161 GeV
- 1997
-
Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 393:1-2, s. 245-260
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A search with the DELPHI detector at LEP for excited leptons (e*, mu*, tau* and nu*) decaying through gamma, W or Z transitions is reported. The data used correspond to an integrated luminosity of 10 pb(-1) e(+)e(-) centre-of-mass energy at an e of 161 Ge
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| 68. |
- Abreu, P, et al.
(författare)
-
Search for neutral and charged Higgs bosons in e(+)e(-) collisions at root s=161 GeV and 172 GeV
- 1998
-
Ingår i: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 2:1, s. 1-37
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A search for neutral and charged Higgs bosons has been performed in the data collected by the DELPHI detector at centre-of-mass energies of 161 GeV and 172 GeV. The analysis assumes either the pair-production of charged Higgs bosons, H+/-, or the producti
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| 69. |
- Abreu, P., et al.
(författare)
-
Search for sleptons in e+e- collisions at √s = 183 to 189 GeV
- 2001
-
Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 19:1, s. 29-42
-
Tidskriftsartikel (refereegranskat)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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| 70. |
- Abreu, P., et al.
(författare)
-
Study of dimuon production in photon-photon collisions and measurement of QED photon structure functions at LEP
- 2001
-
Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 19:1, s. 15-28
-
Tidskriftsartikel (refereegranskat)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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