scholarly journals BOSON MASS SPECTRUM INSU(4)L⊗U(1)YMODEL WITH EXOTIC ELECTRIC CHARGES

2009 ◽  
Vol 24 (22) ◽  
pp. 1731-1742 ◽  
Author(s):  
ADRIAN PALCU
Keyword(s):  
Mass Spectrum ◽  
Mass Scale ◽  
Boson Mass ◽  
Gauge Models

The boson mass spectrum of the electroweak SU (4)L⊗ U (1)Ymodel with exotic electric charges is investigated by using the algebraical approach supplied by the method of solving gauge models with high symmetries. Our approach predicts for the boson sector a one-parameter mass scale to be tuned in order to match the data obtained at LHC, LEP, CDF.

scholarly journals ELECTROWEAKSU(4)L⊗U(1)YMODELS WITHOUT EXOTIC ELECTRIC CHARGES

2009 ◽  
Vol 24 (25n26) ◽  
pp. 4923-4938 ◽  
Author(s):  
ADRIAN PALCU
Keyword(s):  
Mass Spectrum ◽  
Standard Model ◽  
Mass Scale ◽  
Boson Mass ◽  
Gauge Models ◽  
The Standard Model ◽  
The One

For the particular class of SU (4)L⊗ U (1)Yelectroweak models without exotic electric charges, some plausible phenomenological predictions — such as the boson mass spectrum and charges of all the fermions involved therein — are made by using the algebraical approach of the exactly solving method for gauge models with high symmetries. Along with the one-parameter resulting mass scale (to be confirmed at TeV scale in LHC) our approach predicts the exact expressions of the charges (both electric and neutral) in the fermion sector, while all the Standard Model phenomenology is naturally recovered.

scholarly journals SU(n) ⊗ U(1)c Gauge Models with Spontaneous Symmetry Breaking

1997 ◽  
Vol 12 (08) ◽  
pp. 1483-1509 ◽  
Author(s):  
Ion I. Cotăescu
Keyword(s):  
Exact Solution ◽  
Mass Spectrum ◽  
Symmetry Breaking ◽  
Higgs Mechanism ◽  
Boson Mass ◽  
Coupling Coefficients ◽  
Yukawa Couplings ◽  
Gauge Models ◽  
The Standard Model ◽  
General Method

A possible generalization of the technique of the standard model to SU (n) ⊗ U (1) gauge models is proposed. A special Higgs mechanism and a new kind of Yukawa couplings in unitary gauge are introduced. These allow us to obtain a general method for deriving boson mass spectrum and coupling coefficients which will be used to find an exact solution of the Frampton–Pisano–Pleitez three-generation SU (3) ⊗ U (1) model.

scholarly journals NEUTRINO MASS AS A CONSEQUENCE OF THE EXACT SOLUTION OF 3-3-1 GAUGE MODELS WITHOUT EXOTIC ELECTRIC CHARGES

2006 ◽  
Vol 21 (15) ◽  
pp. 1203-1217 ◽  
Author(s):  
ADRIAN PALCU
Keyword(s):  
Exact Solution ◽  
Mass Spectrum ◽  
Higgs Sector ◽  
Original Method ◽  
Boson Mass ◽  
Gauge Models ◽  
Left Handed ◽  
Order Of Magnitude ◽  
Breaking Mechanism ◽  
Straightforward Consequence

The unjustly neglected method of exactly solving generalized electroweak models — with an original spontaneous symmetry breaking mechanism based on the gauge group SU (n)L⊗ U (1)Y — is applied here to a particular class of chiral 3-3-1 models. This procedure enables us, without resorting to any approximation, to express the boson mass spectrum and charges of the particles involved therein as a straightforward consequence of both a proper parametrization of the Higgs sector and a new generalized Weinberg transformation. We prove that the resulting values can accommodate the experimental ones just by tuning a sole parameter. Furthermore, if we take into consideration both the left-handed and right-handed components of the neutrino (included in a lepton triplet along with their corresponding left-handed charged partner), then we are in the position to propose an original method for the neutrino to acquire a very small but nonzero mass without spoiling the previously achieved results in the exact solution of the model. In order to be compatible with the existing phenomenological data, the range of that sole parameter imposes a large order of magnitude for the vev〈ϕ〉~104 TeV in our method. Consequently, the new bosons of the model have to be very massive.

scholarly journals Flavour effects in gravitational leptogenesis

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Rome Samanta ◽  
Satyabrata Datta
Keyword(s):  
Mass Spectrum ◽  
Chemical Potential ◽  
Mass Scale ◽  
Lepton Number ◽  
Type I ◽  
Lepton Asymmetry ◽  
Seesaw Mechanism ◽  
Set Up ◽  
The Right ◽  
Lepton Number Violating

Abstract Within the Type-I seesaw mechanism, quantum effects of the right-handed (RH) neutrinos in the gravitational background lead to an asymmetric propagation of lepton and anti-leptons which induces a Ricci scalar and neutrino Dirac-Yukawa coupling dependent chemical potential and therefore a lepton asymmetry in equilibrium. At high temperature, lepton number violating scattering processes try to maintain a dynamically generated lepton asymmetry in equilibrium. However, when the temperature drops down, the interactions become weaker, and the asymmetry freezes out. The frozen out asymmetry can act as a pre-existing asymmetry prior to the standard Fukugita-Yanagida leptogenesis phase (Ti ∼ Mi, where Mi is the mass of ith RH neutrino). It is then natural to consider the viability of gravitational leptogenesis for a given RH mass spectrum which is not consistent with successful leptogenesis from decays. Primary threat to this gravity-induced lepton asymmetry to be able to successfully reproduce the observed baryon-to-photon ratio is the lepton number violating washout processes at Ti ∼ Mi. In a minimal seesaw set up with two RH neutrinos, these washout processes are strong enough to erase a pre-existing asymmetry of significant magnitude. We show that when effects of flavour on the washout processes are taken into account, the mechanism opens up the possibility of successful leptogenesis (gravitational) for a mass spectrum M2 » 109GeV » M1 with M1 ≳ 6.3 × 106 GeV. We then briefly discuss how, in general, the mechanism leaves its imprints on the low energy CP phases and absolute light neutrino mass scale.

scholarly journals Vector Boson Mass Spectrum from Extra Dimension

2013 ◽  
Vol 04 (07) ◽  
pp. 991-993 ◽  
Author(s):  
Dao Vong Duc ◽  
Nguyen Mong Giao
Keyword(s):  
Mass Spectrum ◽  
Extra Dimension ◽  
Vector Boson ◽  
Boson Mass

scholarly journals A SCREENING MECHANISM FOR EXTRA W AND Z GAUGE BOSONS

2000 ◽  
Vol 15 (21) ◽  
pp. 3369-3394
Author(s):  
JOAQUIM MATIAS ◽  
ALESSANDRO VICINI
Keyword(s):  
Mass Spectrum ◽  
Gauge Boson ◽  
Extra Dimensions ◽  
Boson Mass ◽  
Gauge Bosons ◽  
Gauge Boson Mass ◽  
Kaluza Klein

We generalize a previous construction of a fermiophobic model to the case of more than one extra W and Z gauge bosons. We focus in particular on the existence of screening configurations and their implication on the gauge boson mass spectrum. One of these configurations allows for the existence of a set of relatively light new gauge bosons, without violation of the quite restrictive bounds coming from the ρ NC parameter. The links with Bess and degenerate Bess models are also discussed. Also the signal given here by this more traditional gauge extension of the SM could help to disentangle it from the towers of Kaluza–Klein states over W and Z gauge bosons in extra dimensions.

scholarly journals CHARGES AND MASS SPECTRUM IN THE PISANO–PLEITEZ–FRAMPTON 3-3-1 GAUGE MODEL

2008 ◽  
Vol 23 (14) ◽  
pp. 1011-1030 ◽  
Author(s):  
ION I. COTĂESCU ◽  
ADRIAN PALCU
Keyword(s):  
Mass Spectrum ◽  
Gauge Symmetry ◽  
Standard Model ◽  
Neutrino Mass ◽  
Higgs Mechanism ◽  
Gauge Model ◽  
Gauge Models ◽  
Fermion Masses ◽  
Mass Pattern ◽  
General Method

The Pisano–Pleitez–Frampton 3-3-1 model is revisited here within the framework of the general method for solving gauge models with high symmetries. This exact algebraical approach — proposed several years ago by one of us — was designed to include a minimal Higgs mechanism that spontaneously breaks the gauge symmetry up to the universal U(1)em electromagnetic one and, consequently, to supply the mass spectrum and the couplings of the currents for all the particles in the model. We prove in this paper that this powerful tool, when is applied to the PPF 3-3-1 model, naturally recovers the whole Standard Model phenomenology and, in addition, predicts — since a proper parametrization is employed — viable results such as: (i) the exact expressions for the boson and fermion masses, (ii) the couplings of the charged and neutral currents and (iii) a plausible neutrino mass pattern. A generalized Weinberg transformation is implemented, while the mixing between the neutral bosons Z and Z′ is performed as a necessary step by the method itself. Some phenomenological consequences are also sketched, including the strange possibility that simultaneously m(Z) = m(Z′) and m(W) = m(V) hold.

scholarly journals Natural relaxation

2016 ◽  
Vol 31 (39) ◽  
pp. 1650215 ◽  
Author(s):  
Luca Marzola ◽  
Martti Raidal
Keyword(s):  
Hadron Collider ◽  
Planck Scale ◽  
Vacuum State ◽  
Relaxation Mechanism ◽  
Mass Scale ◽  
Boson Mass ◽  
Inflationary Cosmology ◽  
Vacuum Stability ◽  
Seesaw Mechanism ◽  
The One

Motivated by natural inflation, we propose a relaxation mechanism consistent with inflationary cosmology that explains the hierarchy between the electroweak scale and Planck scale. This scenario is based on a selection mechanism that identifies the low-scale dynamics as the one that is screened from UV physics. The scenario also predicts the near-criticality and metastability of the Standard Model (SM) vacuum state, explaining the Higgs boson mass observed at the Large Hadron Collider (LHC). Once Majorana right-handed neutrinos are introduced to provide a viable reheating channel, our framework yields a corresponding mass scale that allows for the seesaw mechanism as well as for standard thermal leptogenesis. We argue that considering singlet scalar dark matter extensions of the proposed scenario could solve the vacuum stability problem and discuss how the cosmological constant problem is possibly addressed.

scholarly journals CANONICAL SEESAW MECHANISM IN ELECTROWEAKSU(4)L⊗U(1)YMODELS

2009 ◽  
Vol 24 (32) ◽  
pp. 2589-2600 ◽  
Author(s):  
ADRIAN PALCU
Keyword(s):  
Mass Spectrum ◽  
Standard Model ◽  
Free Parameter ◽  
New Physics ◽  
Seesaw Mechanism ◽  
Gauge Models ◽  
M 10 ◽  
The Standard Model ◽  
Neutrino Mass Spectrum ◽  
Breaking Scale

In this paper we show that the canonical seesaw mechanism can naturally be implemented in a particular class of electroweak SU (4)L⊗ U (1)Ygauge models. The resulting neutrino mass spectrum is determined by just tuning a unique free parameter a within the algebraical method of treating gauge models with high symmetries proposed several years ago by Cotăescu. All the Standard Model phenomenology is preserved, being unaffected by the new physics occurring at a high breaking scale m ~ 1011GeV .

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