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  • Digitale Medien  (5)
  • 1990-1994  (5)
Datenquelle
Materialart
  • Digitale Medien  (5)
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Bhabha scattering with higher order weak loop corrections (1991)
    Springer
    The European physical journal 49 (1991), S. 485-490 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present a compact incorporation of the weak loop effects in the Bhabha cross section with the accuracy required by the present precision experiments. Special care is taken of the leading 2-loop effects from a heavy top quark which are of the type α2(m t /M Z )4. We find very satisfactory agreement between two independent calculations which are based on different gauges and different renormalizations. The compact formulation in terms of form factors allows a straight-forward implementation into analytic or Monte Carlo QED calculations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01549702
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    TheZ-width in the two Higgs doublet model (1991)
    Springer
    The European physical journal 51 (1991), S. 695-705 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Effects from an extended Higgs sector on the partial widths $$\Gamma _{{\rm Z} \to b\bar b} $$ and $$\Gamma _{{\rm Z} \to \tau ^ + \tau ^ - } $$ are analysed with emphasis on enhanced Yukawa couplings to the fermions with the weak isospinT 3=−1/2. Contributions from charged and neutral Higgs bosons are incorporated. Vertex corrections from a heavy top quark and from charged Higgs bosons are always negative. One can however find regions in the parameter space where neutral Higgs bosons lead to positive vertex corrections. The charged Higgs bosons decouple from the ratio $$\Gamma ^{_{{\rm Z} \to \tau ^ + \tau ^ - } } /\Gamma ^{_{{\rm Z} \to \mu ^ + \mu ^ - } } $$ if their mass is beyond 80 GeV. This ratio is then sensitive to the neutral sector only.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01565598
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    O(G μ 2 m t 4 ) electroweak radiative corrections to theZb $$\bar b$$ vertex (1993)
    Springer
    The European physical journal 60 (1993), S. 193-198 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The leading heavy-top two-loop corrections to theZb $$\bar b$$ vertex are determined from a direct evaluation of the corresponding Feynman diagrams in the largem t limit. The leading one-loop top-mass effect is enhanced by $$[{{1 + G_\mu m_t^2 ({{9 - \pi ^2 } \mathord{\left/ {\vphantom {{9 - \pi ^2 } 3}} \right. \kern-\nulldelimiterspace} 3})} \mathord{\left/ {\vphantom {{1 + G_\mu m_t^2 ({{9 - \pi ^2 } \mathord{\left/ {\vphantom {{9 - \pi ^2 } 3}} \right. \kern-\nulldelimiterspace} 3})} {(8\pi ^2 \sqrt 2 )}}} \right. \kern-\nulldelimiterspace} {(8\pi ^2 \sqrt 2 )}}]$$ . Our calculation confirms a recent result of Barbieri et al..
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01650447
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Electroweak corrections to the fermionic decay width of the standard Higgs boson (1992)
    Springer
    The European physical journal 53 (1992), S. 507-515 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The partial decay width of the standard model Higgs particle into a general species of fermions $$H \to f\bar f$$ is given at the electroweak 1-loop level. The analytic formulae are applicable to light and heavy fermions. Numerical results are presented for Higgs decays intob andt quarks and into charged leptons. For not too heavy Higgs bosons the radiative corrections are of the order of a few per cent. In particular for Higgs bosons below theW + W − threshold the correction to the partial width intob quarks is very small and insensitive to the top mass. For every heavy Higgs bosons the 1-loop corrections increase the fermionic decay widths for all channels up to 15%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01625912
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Higgss-channel production ine + e − collisions below theW + W − threshold (1991)
    Springer
    The European physical journal 52 (1991), S. 283-288 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The cross section for direct neutral Higgs production in the reaction $$e^ + e^ - \to H^0 \to f \bar f$$ is calculated in theE CM energy range of 40 to 160 GeV and compared to the corresponding Electro-Weak (EW) process $$e^ + e^ - \to (Z,\gamma ) \to f \bar f$$ . Neglecting radiation effects, a signal of the order of 10−4 to 10−3 over the EW can be expected outside theZ 0 region for the Minimal Standard Model Higgs in its decay to a $$b\bar b$$ state. For $$M_H 〉 \sqrt s - M_Z $$ , thes-channel Higgs formation can surpass the Bjorken Bremsstrahlung process and thus may afford at LEP 2 a realistic search method for high mass, say ≧100 GeV Higgs, given enough luminosity. For a non-Standard Model Higgs, in some cases, significantly higher signals are expected. The effects of initial state radiation and-machine energy resolution are evaluated and the gain in using longitudinal polarized electron beams is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01560445
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