SwePub - search: WFRF:(Barao F.)

Enumeration	Reference	Cover	Find
1.	Schael, S, et al. (author) Precision electroweak measurements on the Z resonance 2006 In: Physics Reports. - : Elsevier BV. - 0370-1573 .- 1873-6270. ; 427:5-6, s. 257-454 Research review (peer-reviewed)abstract We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLID experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, m(Z) and Gamma(Z), and its couplings to fermions, for example the p parameter and the effective electroweak mixing angle for leptons, are precisely measured: m(Z) = 91.1875 +/- 0.0021 GeV, Gamma(Z) = 2.4952 +/- 0.0023 GeV, rho(l) = 1.0050 +/- 0.0010, sin(2)theta(eff)(lept) = 0.23153 +/- 0.00016. The number of light neutrino species is determined to be 2.9840 +/- 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, m(t) = 173(+10)(+13) GeV, and the mass of the W boson, m(W) = 80.363 +/- 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of m(t) and m(W), the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285 GeV at 95% confidence level. (c) 2006 Elsevier B.V. All rights reserved.
2.	Abreu, P., et al. (author) Measurement of the gluon fragmentation function and a comparison of the scaling violation in gluon and quark jets 2000 In: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 13:4, s. 573-589 Journal article (peer-reviewed)abstract The fragmentation functions of quarks and gluons are measured in various three-jet topologies in Z decays from the full data set collected with the DELPHI detector at the Z resonance between 1992 and 995. The results at different values of transverse momentum-like scales are compared. A parameterization of the quark and gluon fragmentation functions at a fixed reference scale is given. The quark and gluon fragmentation functions show the predicted pattern of scaling violations. The scaling violation for quark jets as a function of a transverse momentum-like scale is in a good agreement with that observed in lower energy e+e- annihilation experiments. For gluon jets it appears to be significantly stronger. The scale dependences of the gluon and quark fragmentation functions agree with the prediction of the DGLAP evolution equations from which the colour factor ratio CA/CF is measured to be: CA/CF = 2.26 ± 0.09stat. ± 0.06sys. ± 0.12clus.,scale..
3.	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 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.
4.	Abreu, P., et al. (author) Search for sleptons in e+e- collisions at √s = 183 to 189 GeV 2001 In: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 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 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.
5.	Abreu, P, et al. (author) A measurement of alpha(s) from the scaling violation in e(+)e(-) annihilation 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 398:1-2, s. 194-206 Journal article (other academic/artistic)abstract The hadronic fragmentation functions of the various quark flavours and of gluons are measured in a study of the inclusive hadron production from Z(0) decays with the DELPHI detector and are compared with the fragmentation functions measured elsewhere at e
6.	ABREU, P, et al. (author) A MEASUREMENT OF B+ AND B-0 LIFETIMES USING (D)OVER-BAR-L(+) EVENTS 1995 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. ; 68:1 Other publication (other academic/artistic)
7.	Abreu, P, et al. (author) A measurement of the photon structure function F-2(gamma) at an average Q(2) of 12 GeV2/c(4) 1996 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. ; 69:2 Other publication (other academic/artistic)
8.	ABREU, P, et al. (author) A MEASUREMENT OF THE TAU-LEPTONIC BRANCHING FRACTIONS 1995 In: PHYSICS LETTERS B. ; 357:4 Other publication (other academic/artistic)
9.	Abreu, P, et al. (author) A precise measurement of the B-d(0) meson lifetime using a new technique 1997 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 74:1, s. 19-32 Journal article (other academic/artistic)abstract From data recorded by DELPHI between 1991 and 1994, which corresponds to 3.2 million hadronic Z(0) decays, a measurement of the <(B-d(0))over bar> meson lifetime, based on the inclusive reconstruction of 3520 +/- 150 semileptonic decays of the type <(B-d(
10.	Abreu, P, et al. (author) A precise measurement of the tau lepton lifetime 1996 In: PHYSICS LETTERS B. ; 365:1-4 Other publication (other academic/artistic)
11.	Abreu, P, et al. (author) A search for eta '(c) production in photon-photon fusion at LEP 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 441:1-4, s. 479-490 Journal article (other academic/artistic)abstract A search for the production of the eta(c)' meson, the first radial excitation of the ground state of charmonium eta(c)(2980), in the photon-photon fusion reaction at LEP has been performed using the data collected by the DELPHI detector during 1992-1996.
12.	ABREU, P, et al. (author) A STUDY OF RADIATIVE MUNON-PAIR EVENTS AT Z(0) ENERGIES AND LIMITS ON AN ADDITIONAL Z' GAUGE BOSON 1995 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. ; 65:4 Other publication (other academic/artistic)
13.	Abreu, P, et al. (author) A study of the hadronic resonance structure in the decay tau -> 3 pi nu(tau) 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 426:3-4, s. 411-427 Journal article (other academic/artistic)abstract The hadronic structure of the decay of the tau lepton to three charged particles, tau --> 3 pi nu(tau), is studied using data collected by the DELPHI detector at LEP between 1992 and 1995. The invariant mass of the 3 pi system, m(3 pi), is fitted using th
14.	Abreu, P, et al. (author) A study of the reaction e(+)e(-)->mu(+)mu(-)gamma(ISR) at LEP and search for new physics at annihilation energies near 80 GeV 1997 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 75:4, s. 581-592 Journal article (other academic/artistic)abstract A study of the channel e(+)e(-) --> mu(+)mu(-)gamma ISR, where gamma ISR is an initial state radiation photon, is presented using data collected by the DELPHI experiment from 1991 to 1994. The total cross-section at effective annihilation: energies (root
15.	Abreu, P, et al. (author) An upper limit for Br(Z(0)->ggg) from symmetric 3-jet Z(0) hadronic decays 1996 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 389:2, s. 405-415 Journal article (other academic/artistic)abstract An upper limit for BR(Z(0) --> 3g) is obtained from a correlation method, which distinguishes statistically between quark and gluon jets by using the difference in their charged particle multiplicity distributions. From the sample of threefold symmetric t
16.	ABREU, P, et al. (author) B-ASTERISK PRODUCTION IN Z-DECAYS 1995 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. ; 68:3 Other publication (other academic/artistic)
17.	Abreu, P, et al. (author) Charged particle multiplicity in e(+)e(-) interactions at root s=130 GeV 1996 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 372:1-2, s. 172-180 Journal article (other academic/artistic)abstract From the data collected by DELPHI at LEP in autumn 1995, the multiplicity of charged particles at a hadronic energy of 130 GeV has been measured to be [n(ch)] = 23.84 +/- 0.51(stat) +/- 0.52(syst), When compared to lower energy data, the value measured is
18.	Abreu, P, et al. (author) Charged particle multiplicity in e(+)e(-)-> q(q)over-bar events at 161 and 172 GeV and from the decay of the W boson 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 416:1-2, s. 233-246 Journal article (other academic/artistic)abstract The data collected by DELPHI in 1996 have been used to measure the average charged particle multiplicities and dispersions in q (q) over bar events at centre-of-mass energies of root s = 161 GeV and root s = 172 GeV, and the average charge multiplicity in
19.	Abreu, P, et al. (author) Cross-sections and leptonic forward-backward asymmetries from the Z(0) running of LEP 2000 In: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER-VERLAG. - 1434-6044. ; 16:3, s. 371-405 Journal article (peer-reviewed)abstract During 1993 and 1995 LEP was run at 3 energies near the Z(0) peak in order to give improved measurements of the mass and width of the resonance. During 1994, LEP operated only at the Z(0) peak. In total DELPHI accumulated data corresponding to an integrat
20.	Abreu, P, et al. (author) Determination of the average lifetime of b-baryons 1996 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 71:2, s. 199-210 Journal article (other academic/artistic)abstract The average lifetime of b-baryons has been studied using 3 x 10(6) hadronic Z(0) decays collected by the DELPHI detector at LEP. Three methods have been used, based on the measurement of different observables: the proper decay time distribution of 206 ver
21.	Abreu, P, et al. (author) Determination of vertical bar V-cb vertical bar from the semileptonic decay B-0->D(-)l(+)nu 1996 In:* ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 71:4, s. 539-553 Journal article (other academic/artistic)abstract Semileptonic decays B --> D(-)l(+)nu X were selected from a sample of 3.1 million hadronic Z decays collected by the DELPHI detector at LEP. A topological search for semileptonic B decays to resonant and non-resonant D(-)pi(+) states was performed and t
22.	Abreu, P, et al. (author) First evidence for a charm radial excitation, D-' 1998 In:* PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 426:1-2, s. 231-242 Journal article (other academic/artistic)abstract Using D+ mesons exclusively reconstructed in the DELPHI detector at LEP, an excess of 66 +/- 14(stat.) events is observed in the D(+)pi(+)pi(-) final state with a mass of 2637 +/- 2(stat.) +/- 6(syst.) MeV/c(2) and a full width smaller than 15 MeV/c(2)
23.	ABREU, P, et al. (author) FIRST EVIDENCE OF HARD SCATTERING PROCESSES IN SINGLE TAGGED GAMMA-GAMMA-COLLISIONS 1995 In: PHYSICS LETTERS B. ; 342:1-4 Other publication (other academic/artistic)
24.	Abreu, P, et al. (author) First measurement of f'(2)(1525) production in Z(0) hadronic decays 1996 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 379:1-4, s. 309-318 Journal article (other academic/artistic)abstract The inclusive production of the f(2)'(1525) in hadronic Z(0) decays has been studied in data collected by the DELPHI detector at LEP. The Ring Imaging Cherenkov detectors were important tools in the identification of the decay f(2)'(1525) --> K+K-. The av
25.	Abreu, P, et al. (author) Identified particles in quark and gluon jets 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 401:1-2, s. 118-130 Journal article (other academic/artistic)abstract A sample of about 1.4 million hadronic Z decays, selected among the data recorded by the DELPHI detector at LEP during 1994, was used to measure for the first time the momentum spectra of K+, K-0, p, Lambda and their antiparticles in gluon and quark jets.
26.	ABREU, P, et al. (author) INCLUSIVE MEASUREMENTS OF THE K+/- AND P/(P)OVER-BAR PRODUCTION IN HADRONIC Z(0) DECAYS 1995 In: NUCLEAR PHYSICS B. ; 444:1-2 Other publication (other academic/artistic)
27.	Abreu, P, et al. (author) Investigation of the splitting of quark and gluon jets 1998 In: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 4:1, s. 1-17 Journal article (other academic/artistic)abstract The splitting processes in identified quark and gluon jets are investigated using longitudinal and transverse observables. The jets are selected from symmetric three-jet events measured in Z decays with the DELPHI detector in 1991-1994. Gluon jets are ide
28.	ABREU, P, et al. (author) J/PSI-PRODUCTION IN THE HADRONIC DECAYS OF THE Z 1994 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. ; 341:1, s. 109-122 Journal article (other academic/artistic)abstract J/psi mesons have been reconstructed from their decay to mu(+)mu(-) and e(+)e(-), using the data collected by the DELPHI experiment during 1991 and 1992 at the LEP collider. From about 1 million hadronic Z decays 153 +/- 17 J/psi were found, 5.4 +/- 2.3 p
29.	Abreu, P, et al. (author) Kaon interference in the hadronic decays of the Z(0) 1996 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 379:1-4, s. 330-340 Journal article (other academic/artistic)abstract The first measurement of like-sign charged kaon correlations in hadronic decays of the Z(0) is presented, based on data collected by the DELPHI detector. The charged kaons are identified by means of ring imaging Cherenkov detectors. A significant enhancem
30.	ABREU, P, et al. (author) LIFETIME AND PRODUCTION-RATE OF BEAUTY BARYONS FROM Z-DECAYS 1995 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. ; 68:3 Other publication (other academic/artistic)
31.	Abreu, P, et al. (author) m(b) at M-Z 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 418:3-4, s. 430-442 Journal article (other academic/artistic)abstract The value of the Lr quark, mass at the M-Z scale defined in the <(MS)over bar> renormalization scheme, m(b)(M-Z), was determined using 2.8 million hadronic Z decays collected during 1992-1994 by the DELPHI detector to be m(b)(M-Z) = 2.67 +/- 0.25 (stat.)
32.	Abreu, P, et al. (author) Mean lifetime of the B-s(0) meson 1996 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 71:1, s. 11-30 Journal article (other academic/artistic)abstract This paper presents an update of the measurement of the mean lifetime of the B-s(0) meson. Combining D-s - l, D-s - h, phi - l and inclusive D-s final states from the 3.2 million hadronic Z decays collected by DELPHI between 1991 and 1994, the B-s(0) mean
33.	Abreu, P, et al. (author) Measurement and interpretation of the W-pair cross-section in e(+)e(-) interactions at 161 GeV 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 397:1-2, s. 158-170 Journal article (other academic/artistic)abstract In 1996 LEP ran at a centre-of-mass energy of 161 GeV, just above the threshold of W-pair production. DELPHI accumulated data corresponding to an integrated luminosity of 9.93 pb(-1), and observed 29 events that are considered as candidates for W-pair pro
34.	Abreu, P, et al. (author) Measurement of B-d(0)-(B-d(0))over-bar oscillations 1997 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 76:4, s. 579-598 Journal article (other academic/artistic)abstract B-d(0) meson oscillations are measured in hadronic Z(0) decays using the charge of a lepton or the mean charge of an event hemisphere to sign the presence of a b or a (b) over bar quark when it is produced, and using the charge of a lepton emitted at larg
35.	Abreu, P, et al. (author) Measurement of correlations between pions from different W's in e(+)e(-)->W+W- events 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 401:1-2, s. 181-191 Journal article (other academic/artistic)abstract Correlations between pions from different W's in e(+)e(-) --> W+W- events are studied using data collected by the DELPHI detector at LEP running at a centre-of-mass energy of 172 GeV in 1996. At the present level of statistics, no enhancement of the corre
36.	Abreu, P, et al. (author) Measurement of the charged particle multiplicity of weakly decaying B hadrons 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 425:3-4, s. 399-412 Journal article (other academic/artistic)abstract From the Z decays recorded in 1994 and 1995 by the DELPHI detector at LEP, the charged particle multiplicity of weakly decaying B hadrons was measured to be: 4.97 +/- 0.03 +/- 0.06 excluding the K-o and Lambda decay products. (C) 1998 Published by Elsevie
37.	Abreu, P, et al. (author) Measurement of the e(+)e(-)->gamma gamma(gamma) cross section at the LEP energies 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 433:3-4, s. 429-440 Journal article (other academic/artistic)abstract The total and the differential cross-sections for the reaction e(+)e(-) --> gamma gamma(gamma) have been measured with the DELPHI detector at LEP at centre-of-mass energies from 130 to 183 GeV for an integrated luminosity of 78.19 pb(-1). The results agre
38.	ABREU, P, et al. (author) MEASUREMENT OF THE FORWARD-BACKWARD ASYMMETRY OF CHARM AND BOTTOM QUARKS AT THE Z-POLE USING D-ASTERISK(+/-)-MESONS 1995 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. ; 66:3 Other publication (other academic/artistic)
39.	ABREU, P, et al. (author) MEASUREMENT OF THE FORWARD-BACKWARD ASYMMETRY OF E(+)E(-)-]Z-]B(B)OVER-BAR USING PROMPT LEPTONS AND A LIFETIME TAG 1995 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. ; 65:4 Other publication (other academic/artistic)
40.	Abreu, P, et al. (author) Measurement of the inclusive charmless and double-charm B branching ratios 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 426:1-2, s. 193-206 Journal article (other academic/artistic)abstract The DELPHI experiment at LEP has measured the inclusive charmless B hadron decay branching ratio, the B branching ratio into two charmed particles, and the total number of charmed particles per B decay, using the hadronic Z data taken between 1992 and 199
41.	Abreu, P, et al. (author) Measurement of the multiplicity of gluons splitting to bottom quark pairs in hadronic Z(0) decays 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 405:1-2, s. 202-214 Journal article (other academic/artistic)abstract An inclusive measurement of the average multiplicity of b (b) over bar pairs from gluons, g(b (b) over bar), in hadronic Z(0) events collected by the DELPHI experiment at LEP, is presented. A counting technique, based on jet b-tagging in 4-jet events, has
42.	Abreu, P, et al. (author) Measurement of the partial decay width R(b)(0)=Gamma(b(b)over-bar)/Gamma(had) of the Z with the DELPHI detector at LEP 1996 In: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. - : SPRINGER VERLAG. - 0170-9739. ; 70:4, s. 531-547 Journal article (other academic/artistic)abstract The partial decay width of the Z to quark pairs has been measured by the DELPHI detector at LEP. B-hadrons, containing b-quarks, were tagged by several methods using tracks with large impact parameters to the primary vertex complemented som
43.	Abreu, P, et al. (author) Measurement of the quark and gluon fragmentation functions in Z(0) hadronic decays 1999 In: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 6:1, s. 19-33 Journal article (other academic/artistic)abstract The transverse, longitudinal and asymmetric components of the fragmentation function are measured from the inclusive charged particles produced in e(+)e(-) collisions at LEP. As in deep inelastic scattering, these data are important for tests of QCD. The
44.	Abreu, P, et al. (author) Measurement of the spin density matrix for the rho(0), K(0)(892) and phi produced in Z(0) decays 1997 In:* PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 406:3, s. 271-286 Journal article (other academic/artistic)abstract The spin density matrix elements for the rho(0), K-0(892) and phi produced in hadronic Z(0) decays are measured in the DELPHI detector. There is no evidence for spin alignment of the K-0(892) and phi, in the region x(p) less than or equal to 0.3 (x(p) =
45.	Abreu, P, et al. (author) Measurement of the transverse spin correlation in Z->tau(+)tau(-) decays 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 404:1-2, s. 194-206 Journal article (other academic/artistic)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
46.	Abreu, P, et al. (author) Measurement of the triple gluon vertex from double quark tagged 4-jet events 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 414:3-4, s. 401-418 Journal article (other academic/artistic)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
47.	Abreu, P, et al. (author) Measurement of the W-pair cross-section and of the W mass in e(+)e(-) interactions at 172 GeV 1998 In: EUROPEAN PHYSICAL JOURNAL C. - : SPRINGER VERLAG. - 1434-6044. ; 2:4, s. 581-595 Journal article (other academic/artistic)abstract From a data sample of 9.98 pb(-1) integrated luminosity, collected by DELPHI at a centre-of-mass energy of 172 GeV, 118 events were selected as W-pair candidates. From these, the branching fraction Br(W --> q (q) over bar) was measured to be 0.660(-0.037)
48.	Abreu, P, et al. (author) Measurement of trilinear gauge couplings in e(+)e(-) collisions at 161 GeV and 172 GeV 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 423:1-2, s. 194-206 Journal article (other academic/artistic)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
49.	Abreu, P, et al. (author) Measurement of vertical bar V-cs vertical bar using W decays at LEP2 1998 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 439:1-2, s. 209-224 Journal article (other academic/artistic)abstract Decays of W+/- bosons, produced at LEP2, have been used to measure the \V-cs\ element of the Cabibbo-Kobayashi-Maskawa matrix. Values for \V-cs\ were extracted both from the measured hadronic branching ratio of W+/- decays and by tagging the flavour of ha
50.	Abreu, P, et al. (author) Observation of charge-ordering in particle production in hadronic Z(0) decay 1997 In: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 407:2, s. 174-184 Journal article (other academic/artistic)abstract Analysis of the rapidity structure of charge correlations in hadronic events from Z(0) decays gives evidence for chain-like charge-ordering of particle production along the thrust axis, as predicted by 'QCD-motivated' string-like fragmentation models. (C)

Skapa referenser, mejla, bekava och länka

Permalink

Träfflista för sökning "WFRF:(Barao F.) "

Refine your search

Year