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SU(3) breaking in pseudoscalar-meson charge radii from QCD sum rules (1986)

Bagán, E. ; Bramon, A. ; Cornet, F.

Springer

The European physical journal 32 (1986), S. 227-231

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract TheSU(3)-symmetry breaking observed in theπ +,K + andK 0 charge-radii or, equivalently, in the ϱππ, ϱKK and φKK coupling constants is discussed in the Shifman-Vainshtein-Zakharov approach to three-point functions in the symmetrical subtraction configuration. The results are very stable and in good agreement with the data.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01552499

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Digitale Medien

Heavy and heavy to light quark expansions (1986)

Bagán, E. ; Latorre, J. I. ; Pascual, P.

Springer

The European physical journal 32 (1986), S. 43-53

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01441349

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