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  • 1995-1999  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Study of nuclear density effects on secondary hadrons many-particle correlations (1995)
    Springer
    The European physical journal 351 (1995), S. 209-215 
    Details
    ISSN: 1434-601X
    Keywords: 13.85.-t ; 13.85.Ni
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The data obtained by the bubble chambers and nuclear photoemulsion in the interval of energies from 4 up to 400 GeV have been analysed in the quasirapidity scale with the purpose of secondary hadrons' clasterisation study. The new method of the multiparticle correlations, independing on the energy, quasirapidity interval chosen and models, has been proposed in this work. It is shown that the density correlations of different signs in the analysed events are observed. Among their the events with maximal densities, in which the correlations factor does not differ from background beyond a double statistical error, are not observed. However are bumps at 400 GeV the values of which require an affimation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289531
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Complete calculations of $Wb\bar{b}$ and $Wb\bar{b}+$ jet production at Tevatron and LHC: Probing anomalous Wtb couplings in single-top production (1999)
    Springer
    The European physical journal 11 (1999), S. 473-484 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We present the results of a complete tree-level calculation of the processes $pp(\bar{p}) \to Wb\bar{b}$ and $Wb\bar{b}+$ jet that includes the single-top signal and all irreducible backgrounds simultaneously. In order to probe the structure of the Wtb coupling with the highest possible accuracy and to look for possible deviations from standard model predictions, we identify sensitive observables and propose an optimal set of cuts which minimizes the background, as compared to the signal. At the Large Hadron Collider (LHC), the single-top and the single-antitop rates are different, and the corresponding asymmetry yields additional information. The analysis shows that the sensitivity for anomalous couplings will be improved at the LHC by a factor of 2–3, as compared to the expectations for the first measurements at the upgraded Tevatron. Still, the bounds on anomalous couplings obtained at hadron colliders will remain 2–8 times larger than those from high-energy $\gamma e$ colliders; however, these will not be available for some time. All basic calculations have been carried out using the computer package CompHEP. The known next-to-leading-order corrections to the single-top rate have been taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100529900071
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Higgs and background production in the reaction $$e^ + e^ - \to b\bar b + 2$$ jets at LEPII and NLC energies (1995)
    Springer
    The European physical journal 67 (1995), S. 613-620 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A complete tree-level Standard Model calculation of the reaction $$e^ + e^ - \to b\bar b + 2$$ jets in the energy range of LEPII and the Nexte +e− Linear Collider is presented. The 2-jet system represents either aq $$\bar q$$ pair or two gluons. The matrix elements were calculated by means of the package CompHEP, and phase space integration and event generation were carried out with the computer programs BASES/SPRING. Cross sections of the Higgs boson, the total background and important subsets of background are studied as functions of the c.m.s. energy and the Higgs mass, taking into account possible interferences. Various event distributions calculated for realistic integrated luminosities indicate encouraging prospects regarding the extraction of the Higgs signal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01553987
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    Paper (German National Licenses)
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