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  • 1
    Electronic Resource
    Electronic Resource
    Process $Z{\rightarrow}h(A)+\gamma$ in the 2HDM and the experimental constraints from LEP (1999)
    Springer
    The European physical journal 8 (1999), S. 495-505 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The one-loop branching ratios for the process $Z{\rightarrow}h(A)+\gamma$ are calculated in the general two Higgs doublet model (Model II), taking into account existing constraints on the model parameters. For Higgs boson masses below 50 GeV and $\tan \beta$ of ${\cal O}(1-10)$ the fraction of such Z decays are at the level of $10^{-7}$ , but can be significantly stronger for very low or high $\tan \beta$ , where the dependence of these results on other model parameters like $\sin (\beta - \alpha )$ and the mass of the charged Higgs boson is found to be of little importance. The results are compared to the LEP measurements, which are sensitive to branching ratios of $Z{\rightarrow}h(A)+\gamma$ of the order $10^{-5}$ for masses $\ge 20$ GeV, but approach $10^{-6}$ for low masses. By relating the expectation to the experimental limits, constraints on the parameter space of the 2HDM are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100529901090
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  • 2
    Electronic Resource
    Electronic Resource
    Implications of the precision data for very light Higgs Boson scenarios in 2HDM(II) (1999)
    Springer
    The European physical journal 11 (1999), S. 661-672 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We present an up-to-date analysis of the constraints the precision data impose on the (CP-conserving) Two Higgs Doublet Model of type II with emphasis on the possible existence of very light neutral (pseudo)scalar Higgs boson with mass below 20–30 GeV. We show that even in the presence of such light particles, the 2HDM(II) can describe the electroweak data with the precision comparable to that given by the SM. Particularly interesting lower limits on the mass of the lighter neutral CP-even scalar $h^0$ are obtained in the scenario with light CP-odd Higgs boson $A^0$ and large $\tan\beta$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100529900217
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Surface Composition of the CoPd Alloys Studied by Electron Spectroscopies (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 356-365 
    Details
    ISSN: 0142-2421
    Keywords: cobalt ; palladium ; alloys ; Auger electron spectroscopy ; x-ray photoelectron spectroscopy ; surface composition ; surface segregation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Palladium-based alloys and bimetallic systems are of importance in heterogeneous catalysis. Recently, attention was devoted to studies of the catalytic properties of the Co—Pd binary system. An important issue to consider is the surface composition of this alloy. The aim of the present work was to determine the surface composition of the polycrystalline CoPd alloys in a wide range of constituent concentrations (Co30Pd70 at.%, Co50Pd50 at.% and Co70Pd30 at.%) at temperatures up to 900°C. Quantitative AES and XPS analyses were used for this purpose. To determine the surface composition, the values of the inelastic mean free path (IMFP) for the studied alloys are necessary. These were derived from the elastic peak intensity. The reported values of the IMFP for Pd are in agreement with the data available in the literature. Reasonable consistency of the IMFP values for CoPd alloys and Co was also observed. The surface compositions of the CoPd alloys at room temperature determined by AES and XPS are in good agreement. It has been found that Pd segregates to surfaces of the Co30Pd70 and Co50Pd50 alloys at temperatures above 300°C. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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