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  • 1
    Electronic Resource
    Electronic Resource
    Identification of the gene variations in human IKKA (1999)
    Springer
    Immunogenetics 50 (1999), S. 363-365 
    Details
    ISSN: 1432-1211
    Keywords: Key words IKKα ; Polymorphism ; Okasitis ; Rheumatoid arthritis ; Systemic lupus erythematosus ; Crohn's disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510050615
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  • 2
    Electronic Resource
    Electronic Resource
    Probing QCD with heavy quarkonia (1986)
    Springer
    The European physical journal 33 (1986), S. 135-150 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The sensitivity of the charmonium and bottomonium spectroscopy to the short distance part of the interquark potential is critically re-examined using the latest data. We confirm that the data cannot accomodate a QCD scale parameter $$\left( {\Lambda _{\overline {MS} } } \right)$$ smaller than about 150 MeV, whereas we find no constraint on larger values for the scale parameter, contrary to a previous analysis. The effect of dynamical heavy quark masses in the loop correction to the perturbative potential is studied in detail and the effective four quark theory with a massive charmed quark is found to give an accurate description of the perturbative potential for quarkonia of mass up to about 200 GeV. It is argued that the experimental determination of the mass ande + e − decay width of the 1S and 2S toponium resonances (of mass round 80 GeV) with the accuracy anticipated at the forthcominge + e − colliders should enable the QCD scale parameter to be determined to within ±100 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410461
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  • 3
    Electronic Resource
    Electronic Resource
    A novel approach to confront electroweak data and theory (1994)
    Springer
    The European physical journal 64 (1994), S. 559-620 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A novel approach to study electroweak physics at one-loop level in generic SU(2)L×U(1)Y theories is introduced. It separates the 1-loop corrections into two pieces: process specific ones from vertex and box contributions, and universal ones from contributions to the gauge boson propagators. The latter are parametrized in terms of four effective form factors $$\bar e^2 (q^2 ), \bar s^2 (q^2 ), \bar g_Z^2 (q^2 )$$ and $$\bar g_W^2 (q^2 )$$ corresponding to the γγ, γZ,ZZ andWW propagators. Under the assumption that only the Standard Model contributes to the process specific corrections, the magnitudes of the four form factors are determined atq 2=0 and atq 2=m Z 2 by fitting to all available precision experiments. These values are then compared systematically with predictions of SU(2)L×U(1)Y theories. In all fits α s (m Z ) and $$\bar \alpha (m_Z^2 )$$ are treated as external parameters in order to keep the interpretation as flexible as possible. The treatment of the electroweak data is presented in detail together with the relevant theoretical formulae used to interpret the data. No deviation from the Standard Model has been identified. Ranges of the top quark and Higgs boson masses are derived as functions of α s (m Z ) and $$\bar \alpha (m_Z^2 )$$ . Also discussed are consequences of the recent precision measurement of the left-right asymmetry at SLC as well as the impact of a top quark mass and an improvedW mass measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01957770
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  • 4
    Electronic Resource
    Electronic Resource
    Prospects of measuring general Higgs couplings at $e^+e^-$ linear colliders (2000)
    Springer
    The European physical journal 14 (2000), S. 457-468 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We examine how accurately the general HZV couplings, with $V=Z,\gamma$ , may be determined by studying $e^+e^-\to Hf\bar{f}$ processes at future $e^+e^-$ linear colliders. By using the optimal-observable method, which makes use of all available experimental information, we find out which combinations of the various HZV coupling terms may be constrained most efficiently with high luminosity. We also assess the benefits of measuring the tau-lepton helicities, identifying the bottom-hadron charges, polarizing the electron beam and running at two different collider energies. The HZZ couplings are generally found to be well constrained, even without these options, while the $HZ\gamma$ couplings are not. The constraints on the latter may be significantly improved by beam polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520000366
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  • 5
    Electronic Resource
    Electronic Resource
    The ratio between the fast and slow forms of bovine cytochrome c oxidase is changed by cholate or nucleotides bound to the cholate-binding site close to the cytochrome a3/CuB binuclear centre (2000)
    Springer
    Cellular and molecular life sciences 57 (2000), S. 1482-1487 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Mitochondrial particles; cytochrome oxidase; fast and slow conformation; cyanide binding; nucleotides; cholate; structure.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. We determined the fraction of ‘slow’ and ‘fast’ conformations of bovine cytochrome c oxidase, following the kinetics of cyanide binding to the oxidized enzyme. We investigated whether treatment of heart mitochondrial particles with different commercially available types of cholate (standard and ultra-pure) can affect the fraction of cytochrome c oxidase in the two states. Compared to standard cholate, the use of ultra-pure cholate for solubilization of heart mitochondrial particles significantly increased the fraction of the fast enzyme. Complete homogeneity (∼100% fast) was observed when cytochrome c oxidase was solubilized with ultra-pure cholate from heart mitochondrial particles pre-equilibrated with AMP; equilibration with ADP yielded a much smaller fraction of fast enzyme (∼35%). These observations are discussed on the basis of the structural relationships between the known cholate-binding site and the binuclear cytochrome a3-CuB site: variation in the occupancy of this binding site with cholate or nucleotides may modify reactivity of the oxidized binuclear centre towards cyanide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000631
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  • 6
    Electronic Resource
    Electronic Resource
    Tunneling conductance of a Bi2−xPbxSr2Ca2Cu3O10−y-SnO2 junction (1991)
    Springer
    The European physical journal 85 (1991), S. 7-14 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fine structures were observed in the tunneling conductance of a sintered Bi 2223-SnO2 junction. The structures are weaker than those of a single crystalline Bi2212. They correspond to the Raman spectrum of Bi2223 and approximately to the phonon density of states of Bi2212. The structures must therefore be phonon structures, and phonons may contribute substantially to highT c superconductivity. Multiphonon structures are scarcely discernible. Hence we propose a new model, in place of the prior multiphonon model, to explain the rapid increase inT c with the CuO2 layer number. 2Δ (21 K)=68±4 meV inT c=98±5 K. 2Δ (0)/k B T c is 8.1±0.9. The temperature dependence of the gap was also observed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01387782
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  • 7
    Electronic Resource
    Electronic Resource
    Probing the CP nature of the Higgs bosons by $t\overline{t}$ productionat photon linear colliders (2003)
    Springer
    The European physical journal 31 (2003), S. 351-364 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We study the effects of heavy Higgs bosons on the $t\overline{t}$ production process at photon linear colliders. The interference patterns between the resonant Higgs production amplitudes and the continuum QED amplitudes are examined. The patterns tell us not only the CP nature of the Higgs bosons but also the phase of the $\gamma\gamma$ -Higgs vertex which gives new information about the Higgs couplings to new charged particles. We point out that it is necessary to use circularly polarized photon beams to produce efficiently heavy Higgs bosons whose masses exceed the electron beam energy, and show that the above interference patterns of the production amplitudes can be studied by observing t and $\overline{t}$ decay angular distributions. Analytic expressions for the helicity amplitudes for the sequential process $\gamma\gamma \rightarrow t \overline{t} \rightarrow (bW^ + ) (\overline{b}W^-) \rightarrow (b f_1 \overline{f}_2) (\overline{b} f_3 \overline{f}_4)$ are presented in terms of the generic $\gamma\gamma \rightarrow t \overline{t}$ production amplitudes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2003-01280-7
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  • 8
    Electronic Resource
    Electronic Resource
    Excited lepton production at LEP and HERA (1985)
    Springer
    The European physical journal 29 (1985), S. 115-122 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract General expressions for single and pair production cross sections of excited leptons (e *,µ*,v *) are presented. Specific results are shown for a realisticSU(2)×U(1) invariant model. Pair production ine + e − annihilation can measure anomalous magnetic moments of excited leptons. Single production ofe * is dominated by thet-channel γ exchange contribution which makes its detection feasible up to masses just below thee + e − c.m. energy. Due to this small |t| enhancement effect, contributions from elastic and resonance scattering inep production ofe * are substantial. Realistic estimates of the excited lepton production cross section at HERA are given
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571391
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  • 9
    Electronic Resource
    Electronic Resource
    Probing the scalar sector in $$e^ + e^ - \to f\bar fH$$ (1994)
    Springer
    The European physical journal 62 (1994), S. 99-108 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study possible deviations from the Standard Model in the reactione + e −→Zϕ, where ϕ denotes a spinless neutral boson. We show how theZ decay angular correlation can be used to extract detailed information on the ϕ couplings, such as the parity of ϕ, radiatively-induced form factor effects and possible CP violation in the scalar sector. Consequences of gauge invariant dimension six operators are discussed as an example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01559529
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  • 10
    Electronic Resource
    Electronic Resource
    A novel approach to confront electroweak data and theory (1995)
    Springer
    The European physical journal 68 (1995), S. 352-352 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01566682
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