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Sökning: WFRF:(Ferro JM) > (2002-2004) > (2003)

  • Resultat 11-13 av 13
  • Föregående 1[2]
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11.
  • Abdallah, J, et al. (författare)
  • A measurement of the branching fractions of the b-quark into charged and neutral b-hadrons
  • 2003
  • Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier. - 0370-2693. ; 576:1-2, s. 29-42
  • Tidskriftsartikel (refereegranskat)abstract
    • The production fractions of charged and neutral b-hadrons in b-quark events from Z(0) decays have been measured with the DELPHI detector at LEP. An algorithm has been developed, based on a neural network, to estimate the charge of the weakly-decaying b-hadron by distinguishing its decay products from particles produced at the primary vertex. From the data taken in the years 1994 and 1995, the fraction of (b) over bar -quarks fragmenting into positively charged weakly-decaying b-hadrons has been measured to be: f(+) = (42.09+/-0.82(stat)+/-0.89(syst))%. Subtracting the rates for charged Xi(b)(+) and Omega(b)(+) baryons gives the production fraction of B+ mesons: f(Bu) = (40.99+/-0.82(stat)+/-1.11 (syst)) %.
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12.
  • Abdallah, J, et al. (författare)
  • Search for doubly charged Higgs bosons at LEP2
  • 2003
  • Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier. - 0370-2693. ; 552:3-4, s. 127-137
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for pair-produced doubly charged Higgs bosons has been performed using the data collected by the DELPHI detector at LEP at centre-of-mass energies between 189 and 209 GeV. No excess is observed in the data with respect to the Standard Model background. A lower limit for the mass of 97.3 GeV/c(2) at the 95% confidence level has been set for doubly charged Higgs bosons in left-right symmetric models for any value of the Yukawa coupling between the Higgs bosons and the tau leptons. (C) 2002 Published by Elsevier Science B.V.
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13.
  • Abdallah, J, et al. (författare)
  • Search for resonant (nu)over-tilde production at root s=183 to 208 GeV
  • 2003
  • Ingår i: European Physical Journal C. Particles and Fields. - : Springer. - 1434-6044. ; 28:1, s. 15-26
  • Tidskriftsartikel (refereegranskat)abstract
    • Searches for resonant (ν) over tilde production in e(+)e(-) collisions under the assumption that R-parity is not conserved and that the dominant R-parity violating coupling is lambda(121) or lambda(131) used data recorded by DELPHI in 1997 to 2000 at centre-of-mass energies of 183 to 208 GeV. No deviation from the Standard Model was observed. Upper limits are given for the lambda(121) and lambda(131) couplings as a function of the sneutrino mass and total width. The limits are especially stringent for sneutrino masses equal to the centre-of-mass energies with the highest integrated luminosities recorded.
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  • Resultat 11-13 av 13
  • Föregående 1[2]

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