Radiative corrections to electro-weak interactions in supergravity unified theories with equal higgs vacuum expectation values

1984 ◽  
Vol 147 (1-3) ◽  
pp. 65-72 ◽  
Author(s):  
E. Eliasson
Keyword(s):  
Weak Interactions ◽  
Vacuum Expectation ◽  
Radiative Corrections ◽  
Expectation Values ◽  
Higgs Vacuum ◽  
Unified Theories

scholarly journals A NEW ANSATZ FOR QUARK AND LEPTON MASS MATRICES

1992 ◽  
Vol 07 (26) ◽  
pp. 2429-2435 ◽  
Author(s):  
GIAN F. GIUDICE
Keyword(s):  
Vacuum Expectation ◽  
Cabibbo Angle ◽  
Expectation Values ◽  
Higgs Vacuum ◽  
Grand Unified Theories ◽  
Fermion Masses ◽  
Mass Matrices ◽  
Unified Theories ◽  
Free Parameters ◽  
Good Agreement

A new ansatz for quark and lepton mass matrices is proposed in the context of supersymmetric grand unified theories. The 13 parameters describing fermion masses and mixings are determined in terms of only 6 free parameters, allowing 7 testable predictions. The values of Vus, Vcb, Vub, mu, md, ms and mb are then predicted as a function of the 3 charged lepton masses, mc, mt and tan β, the ratio of Higgs vacuum expectation values. In particular the Cabibbo angle and ms/md are determined in terms of only lepton masses. All predictions are in very good agreement with experiments.

scholarly journals VORTEX SOLUTION IN A MULTI-HIGGS SYSTEM AND ITS PHYSICAL IMPLICATION

1993 ◽  
Vol 08 (28) ◽  
pp. 2649-2655
Author(s):  
HOSEONG LA
Keyword(s):  
Vacuum Expectation ◽  
Higgs Potential ◽  
Expectation Values ◽  
Specific Relation ◽  
Higgs Vacuum ◽  
Physical Implication ◽  
Vortex Solution ◽  
Vortex Solutions

Classical vortex solutions in (1 + 2)-dimensional multi-Higgs systems are studied. In particular the existence of such a solution requires equal characteristic lengths and a specific relation between the ratio of the two Higgs vacuum expectation values and the couplings in the Higgs potential, if λ3 ≠ 0.

UPDATED BOUNDS ON HIGGS TRIPLET VACUUM EXPECTATION VALUES AND THE TREE-LEVEL ρ PARAMETER FROM RADIATIVE CORRECTIONS

1991 ◽  
Vol 06 (21) ◽  
pp. 1961-1966 ◽  
Author(s):  
THOMAS G. RIZZO
Keyword(s):  
Parity Violation ◽  
Top Quark ◽  
Input Data ◽  
Vacuum Expectation ◽  
Top Quarks ◽  
Higgs Bosons ◽  
Tree Level ◽  
Radiative Corrections ◽  
Expectation Values ◽  
Upper Limits

We obtain 95% C. L. upper limits on the ratio of triplet to doublet vacuum expectation values in two extended electroweak models from radiative corrections. We use as input data from LEP, the Tevatron, the CERN [Formula: see text] colliders, and various low-energy experiments such as atomic parity-violation and deep inelastic scattering. The analysis includes the incorporation of leading two-loop electroweak contributions to ∆r and ρ arising from heavy top quarks and Higgs bosons, the Consoli–Hollik–Jegerlehner resummation technique, and QCD corrections to the hadronic partial widths of the Z using the new value for the (αs/π)3 coefficient. Our limits are found to be only mildly sensitive to the top quark and Higgs boson masses and somewhat stronger than those obtained previously. Our results are then generalized to bounds on the allowed value of the tree-level ρ parameter.

CP-VIOLATION IN A LEFT-RIGHT SYMMETRIC HORIZONTAL FLAVOUR CHIRAL MODEL

1988 ◽  
Vol 03 (06) ◽  
pp. 607-614 ◽  
Author(s):  
KRISHNANATH BANDYOPADHYAY ◽  
ASIM K. RAY ◽  
AMITAVA RAYCHAUDHURI
Keyword(s):  
Cp Violation ◽  
Gauge Boson ◽  
Relative Phase ◽  
Vacuum Expectation ◽  
Chiral Model ◽  
Expectation Values ◽  
Higgs Vacuum ◽  
Boson Exchange ◽  
Text Model ◽  
Left And Right

A horizontal symmetric [Formula: see text] model is studied in the light of spontaneous CP-violation. The left- and right-handed Kobayashi-Maskawa matrices are real and the CP-nonconservation occurs through horizontal gauge boson exchange. To be in accord with experiment, the relative phase between two Higgs vacuum expectation values must be rather small.

scholarly journals Cosmological evolution of the proton-to-electron mass ratio in an extended Brans–Dicke theory

2019 ◽  
Vol 34 (34) ◽  
pp. 1950277
Author(s):  
Ahmad Mohamadnejad
Keyword(s):  
Particle Physics ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Energy Scale ◽  
Electron Mass ◽  
Mass Ratio ◽  
Higgs Vacuum ◽  
Proton Mass ◽  
Expansion Of The Universe ◽  
The Universe

We study variation of the proton-to-electron mass ratio [Formula: see text] by incorporating Standard Model (SM) of particle physics into an extended Brans–Dicke theory. We show that the evolution of the Higgs vacuum expectation value (VEV), with expansion of the Universe, leads to the variation of the proton-to-electron mass ratio. This is because the electron mass is proportional to the Higgs VEV, while the proton mass is mainly dependent on the quantum chromodynamics (QCD) energy scale, i.e. [Formula: see text]. Therefore, using the experimental and cosmological constraints on the variation of the [Formula: see text], we can constrain the variation of the Higgs VEV. This study is important in understanding the recent claims of the detection of a variation of the proton-to-electron mass ratio in quasar absorption spectra.

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