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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of charmed constituent quarks in hadrons (2000)
    Springer
    Physics of atomic nuclei 63 (2000), S. 606-616 
    Details
    ISSN: 1063-7788
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By using a statistical approach within noncovariant perturbation theory, the distributions of light and charmed quarks in hadrons are derived with allowance for the charmed-quark mass. The parameters of the model are extracted from a comparison with NA3 data on the hadroproduction of J/ψ particles. A reanalysis of EMC data on charm production in muon-nucleon scattering is performed. In relation to the conventional source of charmed quarks from photon-gluon fusion, the EMC data are found to suggest the presence of an additional contribution from deep-inelastic scattering on charmed quarks at large x. The resulting admixture of Fock states that contain charmed quarks in the decomposition of the proton wave function is about 1%. The approach presented for the excitation of Fock states involving charmed quarks can also be applied to states featuring beauty quarks, as well as to the hadronic component of the virtual photon (resolved photon component).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.855675
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  • 2
    Electronic Resource
    Electronic Resource
    Possible manifestations of the existence of a fourth-generation neutrino (1999)
    Springer
    JETP letters 69 (1999), S. 434-440 
    Details
    ISSN: 1090-6487
    Keywords: 14.60.St ; 98.70.Rz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A fourth generation of fermions predicted by the phenomenological heterotic string models can possess a new, strictly conserved charge. Among other things, this leads to the hypothesis of the existence of a fourth massive stable neutrino. A comparison of this hypothesis with the data obtained in the DAMA underground experiment to search for massive weakly-interacting cosmic particles with hidden mass and with the EGRET measurements of the 〉1 GeV galactic gamma-ray background gives a value m≈50 GeV for the possible mass of the fourth neutrino. It is shown that the hypothesis can be checked in accelerator experiments. The positron signal from annihilation of massive relic neutrinos in the galaxy is calculated. A search for this signal is is within the reach of planned cosmic-ray investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568047
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Anti-helium flux as a signature for antimatter globular clusters in our Galaxy (2000)
    Springer
    Physics of atomic nuclei 63 (2000), S. 233-239 
    Details
    ISSN: 1063-7788
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Alpha Magnetic Spectrometer experiment is shown to be sensitive to test the hypothesis on the existence of antimatter globular cluster in our Galaxy. The hypothesis follows from the analysis of possible tests for the mechanisms of baryosynthesis and uses antimatter domains in the matter-dominated Universe as the probe for the physics underlying the origin of matter. The interval of masses for the antimatter in our Galaxy is fixed from below by the condition of antimatter domain survival in the matter-dominated Universe and from above by the observed gamma-ray flux. For this interval, the expected fluxes of anti-helium-3 and anti-helium-4 are calculated with account for their interaction with the matter in the Galaxy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.855627
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An impact parameter analysis of proton-proton elastic and inelastic interactions at 360 GeV/c (1987)
    Springer
    The European physical journal 37 (1987), S. 7-16 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 360 GeV/c proton-proton elastic scattering data obtained at the European Hybrid Spectrometer (EHS) are presented. The differential cross sections of elastic and inelasticpp-interactions are studied as a function of the impact parameter. The results are compared to those obtained at other energies. They are interpreted in the framework of a simple geometrical Monte-Carlo model of inelastic collisions considering protons as composite particles having a definite effective radius with valence quarks inside. The model calculations indicate an increase of the effective radii both of protons and of valence quarks and an increase of the proton opacity with increasing energy. Using this model a description of the overlap function for the total cross section is obtained. A mechanism involving interactions of coloured quarks is proposed leading to a splitting of the overlap function for the total cross section into elastic, inelastic and inelastic diffraction components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01442063
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    Paper (German National Licenses)
    Fulltext
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