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  • 13.60.-r  (1)
  • 13.75.Cs  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Protonium annihilation into two mesons (1991)
    Springer
    The European physical journal 338 (1991), S. 103-110 
    Details
    ISSN: 1434-601X
    Keywords: 13.75.Cs ; 24.10.Eq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The available branching ratios for protonium annihilation into two mesons are analyzed in terms of a hadronic picture. We start from protonium wave functions calculated using a realistic OBE potential, a phenomenological part to account for the annihilation, and a particularly simple transition operatorV(N¯N → meson a + meson b ). Flavour effects, sensitivity to tensor mixing and to isospin mixing are investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279120
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phenomenology of nuclear shadowing in deep-inelastic scattering (1995)
    Springer
    The European physical journal 352 (1995), S. 427-439 
    Details
    ISSN: 1434-601X
    Keywords: 13.60.-r ; 12.40.Vv ; 25.30.Mr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate shadowing effects in deep-inelastic scattering from nuclei at small valuesx 〈 0.1 of the Bjorken variable. Unifying aspects of generalized vector meson dominance and color transparency we first develop a model for deep-inelastic scattering from free nucleons at smallx. In application to nuclear targets we find that the coherent interaction of quark-antiquark fluctuations with nucleons in a nucleus leads to the observed shadowing atx 〈 0.1. We compare our results with most of the recent data for a large variety of nuclei and examine in particular the Q2 dependence of the shadowing effect. While the coherent interaction of low mass vector mesons causes a major part of the shadowing observed in the Q2 range of current experiments, the coherent scattering of continuum quark-antiquark pairs is also important and guarantees a very weak overall Q2 dependence of the effect. We also discuss shadowing in deuterium and its implications for the quark flavor structure of nucleons. Finally we comment on shadowing effects in high-energy photon-nucleus reactions with real photons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299761
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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