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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 32 (1986), S. 43-53 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We analyze the phenomenon of heavy quark condensation within the framework of the QCD sum rule approach. We discuss two alternative expansions for massive quark condensates. The first one (heavy to light quark expansion), introduced by Broadhurst and Generalis, establishes a connection between the heavy and light quark worlds. The other one (heavy quark expansion) is valid when only heavy quark systems are considered. As a byproduct we have obtained the coefficients of $$\left\langle {\bar qq} \right\rangle $$ , $$\left\langle {\bar qGq} \right\rangle $$ , 〈G 2〉 and 〈G 3〉 for all bilinear currents.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We clarify the discrepancies of previous results for the masses and decay amplitudes of hermaphrodite mesons obtained from QCD sum rules. We study the case of the strange quark within a light quark expansion formalism. We find tht the hermaphrodite masses are much higher than the ones of their ordinary meson partners. Our values of the set of masses and continuum thresholds are compared with some other sum rule results. We analyze the hadronic couplings of the isovector 1−+ exotic hermaprodite $$\tilde \rho $$ using a three-point function sum rule evaluated at the symmetric euclidean point. We find that the $$\tilde \rho $$ can be very broad and prefers to decay into ρπ andK * K. Its most characteristic decays are the ones into πγ, ηπ and μ′π. The former and the latter are of the order of (3∼8) MeV.
    Type of Medium: Electronic Resource
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