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  • 1995-1999  (4)
  • 1985-1989  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Integrals for two-loop calculations in massless QCD (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 945-956 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Tools that have been developed for the extension of the Sterman–Weinberg formula in two-loop order are presented. They are the essential ingredients for any perturbative two-loop calculation in a massless theory. Introducing dimensional regularization, this paper deals with poles up to fourth order in the dimensional parameters. The virtual two-loop integrations as well as real ones over phase space are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527586
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Two-jet cross section ine + e − annihilation (1987)
    Springer
    The European physical journal 34 (1987), S. 497-522 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the two-jet cross section in order α s 2 in the framework of massless perturbative QCD, using for jet resolution the jet mass. We derive results for two different approaches. One approach is based on the singularity structure of the various contributions. The other one is adjusted to the methods used in three- and four-jet calculations so that the total cross section can be reconstructed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01679868
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Heavy quark production in order α S 3 (1987)
    Springer
    The European physical journal 34 (1987), S. 523-530 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate one loop corrections to heavy quark production in proton antiproton collisions. We cancel ultraviolet and infrared singularities and give the cross sections on the partonic level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01679869
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1987)
    Springer
    Naturwissenschaften 74 (1987), S. 98-101 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366090
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Longitudinal jet cross sections in order α s 2 (1985)
    Springer
    Communications in mathematical physics 97 (1985), S. 257-266 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We calculate the cross section fore + e −→3 jets for longitudinally polarized virtual photons up to order α s 2 in the quark-gluon coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206189
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Prognostic relevance of immunohistology, tumor size and vascular space involvement in axillary node negative breast cancer (1998)
    Springer
    Archives of gynecology and obstetrics 261 (1998), S. 139-146 
    Details
    ISSN: 1432-0711
    Keywords: Key words: Breast cancer ; Immunohistology ; Prognosis ; Axillary node negative ; ROC curve
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Objective: Adjuvant treatment for patients with axillary node negative (ANN) breast cancer is controversial because operation alone gives a 70% cure rate. Features which predict recurrence are needed and we therefore evaluated the predictive value of tumor diameter and vascular involvement as well as of estrogen receptors (ER), progesterone receptors (PR), p53, MIB-1, c-erb and PCNA demonstrated by immunohistological staining in 178 patients with ANN breast cancer. Although ER status, tumor diameter and vascular space involvement were significantly correlated to the development of recurrence, their sensitivity, specificity and predictive value were too low to give them clinical value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004040050213
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A low-energy compatible SU(4)-type model for vector leptoquarks of mass $\leq$ 1 TeV (1999)
    Springer
    The European physical journal 7 (1999), S. 141-148 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The Standard Model is extended by a $SU(2)_L$ singlet of vector leptoquarks. An additional SU(4) gauge symmetry between right-handed up quarks and right-handed leptons is introduced to render the model renormalizable. The arrangement is made in such a way that no conflict with low energy restrictions is encountered. The $SU(2)_L$ singlet mediates interactions between the right-handed leptons and up type quarks for which only moderate low energy restrictions $M_{LQ}/g_{LQ} 〉 $ few hundred GeV exist. However, it is not a candidate to explain the anomalous HERA data at large $Q^2$ because theoretical reasons imply that $g_{LQ} \geq g_s$ which would give a much stronger anomalous HERA effect. We furthermore argue that the inequality $g_{LQ} \geq g_s$ is a general feature of consistent vector leptoquark models. Although our model is not relevant for HERA, it is interesting per se as a description of leptoquarks of mass $\leq$ 1 TeV consistent with all low-energy requirements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100529900965
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Complete helicity decomposition of the $\gamma^*/Z^*t\bar{t}$ vertex including higher order QCD corrections and applications to $e^+e^-\rightarrow t \bar t$ (1999)
    Springer
    The European physical journal 8 (1999), S. 447-456 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The complete density matrix for all polarization configurations in the process $\gamma^*/Z^* \rightarrow t\bar t$ , where $\gamma^*/Z^*$ is an off-shell photon or Z boson and t is the top quark, is calculated numerically including oneloop QCD corrections, i.e. virtual and real gluon contributions in $O(\alpha_s)$ . The analysis is done in the framework of the helicity formalism. The results are particularly suited for top quark production at the Linear Collider, but may be useful in other circumstances as well. Relations to LEP and Tevatron physics are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100529901098
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    A note on the QCD corrections to forward-backward asymmetries of heavy-quark jets inZ decays (1995)
    Springer
    The European physical journal 67 (1995), S. 123-127 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurement of the forward-backward asymmetries of heavy quarks provides one of the most precise determinations of sin2 θ W inZ decays. We discuss in detail the one-loop QCD radiative corrections to these asymmetries. Results are given for single heavy-quark jet asymmetries and asymmetries of the thrust axis, as well as for heavy-quark two-jet final states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01564827
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Optimized perturbation theory applied to jet cross sections ine + e − annihilation (1988)
    Springer
    The European physical journal 39 (1988), S. 101-108 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The optimized perturbation theory proposed by Stevenson to deal with coupling constant scheme dependence is applied to the calculation ofπ tot and jet multiplicities ine + e − annihilation. The results are compared with those of simple perturbation theory and with recent experimental cluster multiplicities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560397
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    Paper (German National Licenses)
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