منابع مشابه
Baryon axial currents
The baryon axial currents are calculated at one–loop order in heavy baryon chiral perturbation theory by employing both a cutoff and dimensional regularization. Data from the semileptonic baryon decays is used to perform a least–squares fit to the two axial couplings D and F of the effective Lagrangian. Predictions for the momentum dependent axial form factors are made and the two different reg...
متن کاملBaryon Axial Currents in QCD
We prove that the 1/Nc corrections to the baryon axial current matrix elements are proportional to their lowest order values. This implies that the first correction to axial current coupling constant ratios vanishes, and that the SU(2Nf ) spin-flavor symmetry relations are only violated at second order in 1/Nc. UCSD/PTH 93-18 hep-ph/9307242 July 1993
متن کاملBaryon currents in QCD with compact dimensions
B. Lucini, A. Patella and C. Pica a Physics Department, Swansea University, Singleton Park, Swansea SA2 8PP, UK b Scuola Normale Superiore, Piazza dei Cavalieri 27, 56126 Pisa, Italy c INFN Pisa, Largo B. Pontecorvo 3 Ed. C, 56127 Pisa, Italy d Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA Abstract On a compact space with non-trivial cycles, for sufficiently small val...
متن کاملFlavour-Changing Neutral Currents
In this paper we will present the theory of Flavour-Changing Neutral Currents and the possible implications for the discovery of new particles. We also present a search for such currents in decays of B s → μ+μ− and B → μ+μ− , which has direct implications for the constraints of new theories, especially Supersymmetry.
متن کاملFlavor Changing Neutral Currents
A study of Rb and Rc is presented in the context of a Two Higgs Doublet Model (2HDM) with flavor changing scalar currents (FCSC). Implications of the model for the ρ-parameter and for b → sγ are also considered. The experimental data on Rb places stringent constraints on the model parameters. The configuration of the model needed to account for Rb is found to be irreconcilable with constraints ...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1966
ISSN: 0033-068X
DOI: 10.1143/ptp.36.1266