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  • 2000-2004  (2)
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  • 2000-2004  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Probe of the Wtb coupling in $t \bar{t}$ pair production at linear colliders (2000)
    Springer
    The European physical journal 16 (2000), S. 269-278 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The Wtb vertex can be probed on future colliders in the processes of single top production (LHC, pp mode, NLC, $\gamma e$ mode) and of top pair production (NLC, $e^+ e^-$ mode). We analyze observables sensitive to anomalous Wtb couplings in the top pair production process of $e^+ e^-$ collisions. In particular, forward–backward and spin–spin asymmetries of the top decay products and the asymmetry of the lepton energy spectrum are considered. Possible bounds on anomalous couplings obtained are competitive to those expected from the upgraded Tevatron and LHC. The validity of the infinitely small width approximation for the three-body top decay is also studied in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520050019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measuring the Higgs branching fraction into two photons at future linear ${\mathrm e}^+{\mathrm e}^-$ colliders (2001)
    Springer
    The European physical journal 19 (2001), S. 455-461 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We examine the prospects for a measurement of the branching fraction of the $\gamma \gamma$ decay mode of a Standard Model-like Higgs boson with a mass of 120 GeV $/c^2$ at the future TESLA linear ${\mathrm e}^+{\mathrm e}^-$ collider, assuming an integrated luminosity of 1 ab $^{-1}$ and centre-of-mass energies of 350 GeV and 500 GeV. A relative uncertainty on BF(\hgg) of 16% can be achieved in unpolarised ${\mathrm e}^+{\mathrm e}^-$ collisions at $\sqrt{s}$ = 500 GeV, while for $\sqrt{s}$ = 350 GeV the expected precision is slightly poorer. With appropriate initial state polarisations the uncertainty can be improved to 10%. If this measurement is combined with a measurement of the total Higgs width, a precision of 10% on the Higgs boson partial width for the $\gamma \gamma$ decay mode appears feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100636
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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