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University of Massachusetts Amherst

2008

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Articles 331 - 332 of 332

Full-Text Articles in Physical Sciences and Mathematics

Semileptonic Decays Of The Light J(P)=1/2(+) Ground State Baryon Octet, A Faessler, T Gutsche, Br Holstein, Ma Ivanov, Jg Korner, Ve Lyubovitskij Jan 2008

Semileptonic Decays Of The Light J(P)=1/2(+) Ground State Baryon Octet, A Faessler, T Gutsche, Br Holstein, Ma Ivanov, Jg Korner, Ve Lyubovitskij

Physics Department Faculty Publication Series

We calculate the semileptonic baryon octet-octet transition form factors using a manifestly Lorentz covariant quark model approach based on the factorization of the contribution of valence quarks and chiral effects. We perform a detailed analysis of SU(3)-breaking corrections to the hyperon semileptonic decay form factors. We present complete results on decay rates and asymmetry parameters including lepton mass effects for the rates.

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Chiral Corrections To The Vector And Axial Couplings Of Quarks And Baryons, A Faessler, T Gutsche, Br Holstein, Ve Lyubovitskij Jan 2008

Chiral Corrections To The Vector And Axial Couplings Of Quarks And Baryons, A Faessler, T Gutsche, Br Holstein, Ve Lyubovitskij

Physics Department Faculty Publication Series

We calculate chiral corrections to the semileptonic vector and axial quark coupling constants using a manifestly Lorentz covariant chiral quark approach up to order O(p4) in the two- and three-flavor pictures. These couplings are then used in the evaluation of the corresponding couplings which govern the semileptonic transitions between octet baryon states. In the calculation of baryon matrix elements we use a general ansatz for the spatial form of the quark wave function, without referring to a specific realization of hadronization and confinement of quarks in baryons. Matching the physical amplitudes calculated within our approach to the model-independent predictions of …

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