scholarly journals Flavor symmetry breaking in the 1/Ncexpansion

1996 ◽  
Vol 53 (1) ◽  
pp. 273-282 ◽  
Author(s):  
Jin Dai ◽  
Roger Dashen ◽  
Elizabeth Jenkins ◽  
Aneesh V. Manohar
Keyword(s):  
Symmetry Breaking ◽  
Flavor Symmetry

Flavons and LFV decays and productions of pseudoscalar mesons

2019 ◽  
Vol 34 (35) ◽  
pp. 1950288
Author(s):  
Tian-Qi Li ◽  
Chong-Xing Yue
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Flavor Symmetry ◽  
Lepton Flavor ◽  
Flavor Changing ◽  
Pseudoscalar Mesons ◽  
The Standard Model

Flavons are the dynamic agent of flavor symmetry breaking and have flavor changing couplings to the Standard Model (SM) fermions. We consider their contributions to the lepton flavor violating (LFV) decays [Formula: see text] and [Formula: see text] with [Formula: see text], [Formula: see text] or [Formula: see text] and [Formula: see text] in the simplest flavon model without Higgs-flavon mixing. We find that flavons can produce significant contributions to some of these LFV decay processes.

scholarly journals Flavor symmetry breaking in the Δ sea

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
J. J. Ethier ◽  
W. Melnitchouk ◽  
Fernanda Steffens ◽  
A. W. Thomas
Keyword(s):  
Symmetry Breaking ◽  
Flavor Symmetry

scholarly journals BARYONS AS THREE-FLAVOR SOLITONS

1996 ◽  
Vol 11 (14) ◽  
pp. 2419-2544 ◽  
Author(s):  
HERBERT WEIGEL
Keyword(s):  
Symmetry Breaking ◽  
Vector Meson ◽  
Degrees Of Freedom ◽  
Magnetic Moments ◽  
Axial Vector ◽  
Vector Current ◽  
Bound State ◽  
Axial Vector Current ◽  
Flavor Symmetry ◽  
Matrix Elements

The description of baryons as soliton solutions of effective meson theories for three-flavor (up, down and strange) degrees of freedom is reviewed and the phenomenological implications are illuminated. In the collective approach the soliton configuration is equipped with baryon quantum numbers by canonical quantization of the coordinates describing the flavor orientation. The baryon spectrum resulting from exact diagonalization of the collective Hamiltonian is discussed. The prediction of static properties, such as the baryon magnetic moments and the Cabibbo matrix elements for semileptonic hyperon decays, are explored with regard to the influence of flavor symmetry breaking. In particular, the role of strange degrees of freedom in the nucleon is investigated for both the vector and axial vector current matrix elements. The latter are discussed extensively within the context of the proton spin puzzle. The influence of flavor symmetry breaking on the shape of the soliton is examined, and observed to cause significant deviations from flavor-covariant predictions on the baryon magnetic moments. Short range effects are incorporated by a chirally invariant inclusion of vector meson fields. These extensions are necessary for properly describing the singlet axial vector current and the neutron–proton mass difference. The effects of the vector meson excitations on baryon properties are also considered. The bound state description of hyperons and its generalization to baryons containing a heavy quark are illustrated. In the case of the Skyrme model a comparison is made between the collective quantization scheme and the bound state approach. Finally, the Nambu–Jona-Lasinio model is employed to demonstrate that hyperons can be described as solitons in a microscopic theory of the quark flavor dynamics. This is explained for both the collective and the bound state approaches to strangeness.

scholarly journals SPIN STRUCTURE OF THE PROTON

1995 ◽  
Vol 10 (23) ◽  
pp. 1659-1666
Author(s):  
CHUNG-YI WU
Keyword(s):  
Symmetry Breaking ◽  
Spin Structure ◽  
Flavor Symmetry ◽  
Leading Order ◽  
Intrinsic Polarization

By assuming that there is no significant intrinsic polarization of the gluon, we have computed the polarized quark contributions to the proton’s spin under SU(3) flavor symmetry breaking for the polarized sea and have performed a global leading-order QCD fit to obtain the spin-dependent quark distributions, which could be used as input for analyzing lepton-hadron and hadron-hadron collisions.

A quark-model approach to ΛN and ΣN LS forces with flavor symmetry breaking

1993 ◽  
Vol 318 (4) ◽  
pp. 587-591 ◽  
Author(s):  
C. Nakamoto ◽  
Y. Suzuki ◽  
Y. Fujiwara
Keyword(s):  
Symmetry Breaking ◽  
Quark Model ◽  
Flavor Symmetry ◽  
Model Approach

SU(3) Breaking and Annihilation Effects in the η and η′ Masses

1997 ◽  
Vol 12 (02) ◽  
pp. 121-125 ◽  
Author(s):  
W. S. Carvalho ◽  
A. C. B. Antunes ◽  
A. S. de Castro
Keyword(s):  
Symmetry Breaking ◽  
Mass Splitting ◽  
Flavor Symmetry ◽  
Extended Version ◽  
Sum Rule ◽  
Mixing Angle ◽  
Pseudoscalar Mesons

The mass splitting of the pseudoscalar mesons η and η′ is approached by taking into account the SU(3)-flavor symmetry breaking and annihilation effects. An extended version of the Schwinger sum rule and a mixing angle equal to -19.51° are obtained.

scholarly journals Sequential flavor symmetry breaking

2009 ◽  
Vol 80 (3) ◽  
Author(s):  
Thorsten Feldmann ◽  
Martin Jung ◽  
Thomas Mannel
Keyword(s):  
Symmetry Breaking ◽  
Flavor Symmetry
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