scholarly journals Z-Quark Coupling Measurements at SLD

2000 ◽  
Author(s):  
Thomas R Wright
Keyword(s):  
Quark Coupling

scholarly journals SUPERCONDUCTING PHASE TRANSITION IN THE NAMBU–JONA-LASINIO MODEL

2001 ◽  
Vol 16 (17) ◽  
pp. 1129-1138 ◽  
Author(s):  
M. SADZIKOWSKI
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Superconducting Phase ◽  
Coupling Constants ◽  
Coupling Constant ◽  
Rich Phase ◽  
Quark Interaction ◽  
Quark Coupling ◽  
Superconducting Phase Transition

The Nambu–Bogoliubov–de Gennes method is applied to the problem of superconducting QCD. The effective quark–quark interaction is described within the framework of the Nambu–Jona-Lasinio model. The details of the phase diagram are given as a function of the strength of the quark–quark coupling constant G′. It is found that there is no superconducting phase transition when one uses the relation between the coupling constants G′ and G of the Nambu–Jona-Lasinio model which follows from the Fierz transformation. However, for other values of G′ one can find a rich phase structure containing both the chiral and the superconducting phase transitions.

scholarly journals DYANMICAL GENERATION OF LINEAR σ MODEL SU(3) LAGRANGIAN AND MESON NONET MIXING

1998 ◽  
Vol 13 (04) ◽  
pp. 657-676 ◽  
Author(s):  
R. DELBOURGO ◽  
M. D. SCADRON
Keyword(s):  
Scalar Meson ◽  
Dimensional Regularization ◽  
Scalar Mixing ◽  
Coupling Constant ◽  
Mixing Angles ◽  
Quark Coupling ◽  
Quark Level

This paper is the SU(3) extension of the dynamically generated SU(2) linear σ model Lagrangian worked out previously using dimensional regularization. After discussing the quark-level Goldberger–Treiman relations for SU(3) and the related gap equations, we dynamically generate the meson cubic and quartic couplings. This also constrains the meson–quark coupling constant to [Formula: see text] and determines the SU(3) scalar meson masses in a Nambu–Jona-Lasinio fashion. Finally we dynamically induce the U(3) pseudoscalar and scalar mixing angles in a manner compatible with data.

scholarly journals STABILITY OF COLOR-FLAVOR LOCKED STRANGELETS

2006 ◽  
Vol 21 (13n14) ◽  
pp. 3021-3030 ◽  
Author(s):  
O. KIRIYAMA
Keyword(s):  
Size Effects ◽  
Thermodynamic Potential ◽  
Finite Size ◽  
Baryon Number ◽  
Critical Value ◽  
Coupling Constant ◽  
Finite Size Effects ◽  
Quark Coupling ◽  
The Stability ◽  
Quark Flavors

The stability of color-flavor locked (CFL) strangelets is studied in the three-flavor Nambu–Jona-Lasinio model. We consider all quark flavors to be massless, for simplicity. By making use of the multiple reflection expansion, we explicitly take into account finite size effects and formulate the thermodynamic potential for CFL strangelets. We find that the CFL gap could be large enough so that the energy per baryon number of CFL strangelets is greatly affected. In addition, if the quark–quark coupling constant is larger than a certain critical value, there is a possibility of finding absolutely stable CFL strangelets.

scholarly journals On the LHC signatures of $$SU(5)\times U(1)'$$ F-theory motivated models

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
A. Karozas ◽  
G. K. Leontaris ◽  
I. Tavellaris ◽  
N. D. Vlachos
Keyword(s):  
Gauge Symmetry ◽  
Top Quark ◽  
B Meson ◽  
Monodromy Group ◽  
Single Point ◽  
Tree Level ◽  
Fermion Mass ◽  
Internal Space ◽  
Quark Coupling ◽  
Rank One

AbstractWe study low energy implications of F-theory GUT models based on SU(5) extended by a $$U(1)'$$ U ( 1 ) ′ symmetry which couples non-universally to the three families of quarks and leptons. This gauge group arises naturally from the maximal exceptional gauge symmetry of an elliptically fibred internal space, at a single point of enhancement, $$E_8\supset SU(5)\times SU(5)'\supset SU(5)\times U(1)^4.$$ E 8 ⊃ S U ( 5 ) × S U ( 5 ) ′ ⊃ S U ( 5 ) × U ( 1 ) 4 . Rank-one fermion mass textures and a tree-level top quark coupling are guaranteed by imposing a $$Z_2$$ Z 2 monodromy group which identifies two abelian factors of the above breaking sequence. The $$U(1)'$$ U ( 1 ) ′ factor of the gauge symmetry is an anomaly free linear combination of the three remaining abelian symmetries left over by $$Z_2$$ Z 2 . Several classes of models are obtained, distinguished with respect to the $$U(1)'$$ U ( 1 ) ′ charges of the representations, and possible extra zero modes coming in vector-like representations. The predictions of these models are investigated and are compared with the LHC results and other related experiments. Particular cases interpreting the B-meson anomalies observed in LHCb and BaBar experiments are also discussed.

Sign in / Sign up

Export Citation Format

Share Document