TRITA-TFY-93-08hep-ph 9311330 Flavour symmetry breaking in quark magnetic moments
نویسنده
چکیده
We discuss magnetic moments of the baryons allowing for avour symmetry breaking in the quark magnetic moments. We nd that such a symmetry breaking is necessary to achieve consistency with data for the nucleon spin structure obtained from deep inelastic scattering. For the e ective magnetic moments we nd u= d = 1:79 0:06 and s= d = 0:68 0:05. We also calculate weak decay form factors, which in our model turn out to be independent of the symmetry breakings, and nd good agreement with experimental data. Typeset using REVTEX Supported by the Swedish Natural Science Research Council (NFR), contract F-UR32821-105.
منابع مشابه
Magnetic moments of the SU(3) decuplet baryons in the chiral quark-soliton model
Magnetic moments of baryons are studied within the chiral quark soliton model with special emphasis on the decuplet of baryons. The model is used to identify all symmetry breaking terms proportional to ms. Sum rules for the magnetic moments are derived. A “model-independent” analysis of the symmetry breaking terms is performed and finally model calculations are presented which show the importan...
متن کاملA lattice study of the spin structure of the Λ hyperon
The internal spin structure of the Λ is of special importance for the understanding of the spin structure of hadrons in general. The comparison between the nucleon and Λ allows for a test of the relevant flavour-symmetry breaking effects. Using nonperturbatively O(a) improved Wilson fermions in the quenched approximation we have calculated the first moments of the unpo-larised, longitudinally p...
متن کاملLFV and Dipole Moments in Models with A4 Flavour Symmetry
It is presented an analysis on lepton flavour violating transitions, leptonic magnetic dipole moments and electric dipole moments in a class of models characterized by the flavour symmetry A4 × Z3 × U(1)FN , whose choice is motivated by the approximate Tri-Bimaximal mixing observed in neutrino oscillations. A low-energy effective Lagrangian is constructed, where these effects are dominated by d...
متن کاملMagnetic Moment and Isospin Symmetry Breaking ∗
The small mass difference m n − m p = 1.3 MeV between the proton and neutron leads to an excess of n = π − p over p = π + n fluctuations which can be calculated by using a light-cone meson-baryon fluctuation model of intrinsic quark-antiquark pairs of the nucleon sea. The Gottfried sum rule violation may partially be explained by isospin symmetry breaking between the proton and neutron and the ...
متن کاملFlavor structure of the octet magnetic moments
We use the chiral quark-soliton model to identify all symmetry breaking terms linear in ms and investigate the strange magnetic moment in a “modelindependent” way. Assuming hedgehog symmetry and employing the collective quantization, we obtain the most general expression for the flavor-singlet and flavor-octet magnetic moments in terms of seven independent parameters. Having fitted these parame...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997