Extended chiral Group and Scalar DiquarksExtended chiral Group and Scalar Diquarks

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 Author Novozhilov, Yu ♦ Pronko, A. ♦ Vassilevich, D. ♦ Korotkov, A. Source arXiv.org Content type Text File Format PDF Date of Submission 1999-01-08 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword High Energy Physics - Phenomenology ♦ physics:hep-ph Abstract We introduce extended chiral transformation, which depends both on pseudoscalar and diquark fields as parameters and determine its group structure. Assuming soft symmetry breaking in diquark sector, bosonisation of a quasi-Goldstone $ud$-diquark is performed. In the chiral limit the $ud$-diquark mass is defined by the gluon condensate, $m_{ud}\approx 300 MeV$. The diquark charge radius is $^{1/2}\approx 0.5 fm$. We consider also the flavour triplet of scalar diquarks $(ud)$, $(us)$ and $(ds)$ together with pseudoscalar mesons and calculate diquark masses and decay constants in terms of meson parameters and the gluon condensate. Educational Use Research Learning Resource Type Article Page Count 18