scholarly journals NonzeroZ→γγdecays in the renormalizable gauge sector of the noncommutative standard model

2007 ◽  
Vol 75 (9) ◽  
Author(s):  
M. Burić ◽  
D. Latas ◽  
V. Radovanović ◽  
J. Trampetić
Keyword(s):  
Standard Model ◽  
Gauge Sector

scholarly journals STATUS OF HIGHER-ORDER CORRECTIONS IN THE STANDARD ELECTROWEAK THEORY

1995 ◽  
Vol 10 (04) ◽  
pp. 443-464 ◽  
Author(s):  
BERND A. KNIEHL
Keyword(s):  
Standard Model ◽  
Higgs Sector ◽  
Higher Order ◽  
Threshold Effects ◽  
Electroweak Theory ◽  
Radiative Corrections ◽  
Gauge Sector ◽  
The Standard Model ◽  
Text Mode ◽  
Higher Order Corrections

We review recent theoretical progress in the computation of radiative corrections beyond one loop within the standard model of electroweak interactions, in both the gauge and Higgs sectors. In the gauge sector, we discuss universal corrections of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], and those due to virtual [Formula: see text]-threshold effects, as well as specific corrections to [Formula: see text] of [Formula: see text], [Formula: see text] and [Formula: see text] including finite-mb effects. We also present an update of the hadronic contributions to Δα. Theoretical uncertainties, other than those due to the lack of knowledge of MH and mt, are estimated. In the Higgs sector, we report on the [Formula: see text] corrections to [Formula: see text] including those which are specific for the [Formula: see text] mode, the [Formula: see text] corrections to [Formula: see text] including the finite-mq terms, and the [Formula: see text] corrections to Γ(H → gg).

scholarly journals Right–right–left extension of the Standard Model

2016 ◽  
Vol 31 (19) ◽  
pp. 1650117 ◽  
Author(s):  
Gauhar Abbas
Keyword(s):  
Standard Model ◽  
Gauge Group ◽  
Vacuum Expectation ◽  
Expectation Values ◽  
Unique Pattern ◽  
Gauge Sector ◽  
Gauge Symmetries ◽  
The Standard Model ◽  
Higgs Fields ◽  
Scalar Sector

A right–right–left extension of the Standard Model is proposed. In this model, SM gauge group [Formula: see text] is extended to [Formula: see text]. The gauge symmetries [Formula: see text], [Formula: see text] are the mirror counterparts of the [Formula: see text] and [Formula: see text], respectively. Parity is spontaneously broken when the scalar Higgs fields acquire vacuum expectation values (VEVs) in a certain pattern. Parity is restored at the scale of [Formula: see text]. The gauge sector has a unique pattern. The scalar sector of the model is optimum, elegant and unique.

scholarly journals Polarized Z bosons from the decay of a Higgs boson produced in association with two jets at the LHC

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Ezio Maina ◽  
Giovanni Pelliccioli
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Vector Boson ◽  
Z Bosons ◽  
Gluon Fusion ◽  
Gauge Sector ◽  
Fully Differential ◽  
Higgs Decay ◽  
Four Leptons ◽  
Two Jets

AbstractInvestigating the polarization of weak bosons provides an important probe of the scalar and gauge sector of the Standard Model. This can be done in the Higgs decay to four leptons, whose Standard-Model leading-order amplitude enables to generate polarized observables from unpolarized ones via a fully-differential reweighting method. We study the $$\text {Z} $$ Z -boson polarization from the decay of a Higgs boson produced in association with two jets, both in the gluon-fusion and in the vector-boson fusion channel. We also address the possibility of extending the results of this work to higher orders in perturbation theory.

scholarly journals Relativistic geometric quantum phases from the Lorentz symmetry violation effects in the CPT-even gauge sector of Standard Model Extension

2015 ◽  
Vol 30 (33) ◽  
pp. 1550197 ◽  
Author(s):  
K. Bakke ◽  
H. Belich
Keyword(s):  
Standard Model ◽  
Relativistic Quantum ◽  
Lorentz Symmetry ◽  
Relativistic Quantum Mechanics ◽  
Standard Model Extension ◽  
Symmetry Violation ◽  
Quantum Phases ◽  
Gauge Sector ◽  
Model Extension ◽  
Tensor Formula

We discuss the appearance of geometric quantum phases for a Dirac neutral particle in the context of relativistic quantum mechanics based on possible scenarios of the Lorentz symmetry violation tensor background in the CPT-even gauge sector of Standard Model Extension. We assume that the Lorentz symmetry breaking is determined by a tensor background given by [Formula: see text], then, relativistic analogues of the Anandan quantum phase [J. Anandan, Phys. Lett. A 138, 347 (1989)] are obtained based on the parity-even and parity-odd sectors of the tensor [Formula: see text].

The gauge sector of the SME with Lorentz-symmetry violation by symplectic projector method

2015 ◽  
Vol 30 (35) ◽  
pp. 1550191
Author(s):  
H. Belich ◽  
M. A. Santos ◽  
M. T. D. Orlando
Keyword(s):  
Standard Model ◽  
Point Of View ◽  
Standard Model Extension ◽  
Symmetry Violation ◽  
Gauge Sector ◽  
Canonical Formulation ◽  
Effective Metric ◽  
Model Extension ◽  
The Standard Model ◽  
Conditions Of Stability

We propose to analyze a modified electromagnetism inspired from the gauge sector of the Standard Model extension (SME). From the point of view of a canonical formulation, we carried out the usual analysis on the constraints structure of the odd sector (Carroll–Field–Jackiw term) and a Maxwell term with an effective metric. This effective metric is obtained by a vectorial decomposition of the CPT-even term, that is absorbed in the ordinary Maxwell term. Using symplectic projector method (SPM), we obtain the dispersions relations and we have verified conditions of stability to determine the valid spectrum.

scholarly journals The one-loop renormalization of the gauge sector in the θ-expanded noncommutative standard model

2007 ◽  
Vol 2007 (03) ◽  
pp. 030-030 ◽  
Author(s):  
Maja Burić ◽  
Voja Radovanović ◽  
Josip Trampetić
Keyword(s):  
Standard Model ◽  
Gauge Sector ◽  
The One

scholarly journals Consistency of an alternative CPT-odd and Lorentz-violating extension of QED

2019 ◽  
Vol 34 (25) ◽  
pp. 1950139
Author(s):  
J. C. C. Felipe ◽  
H. G. Fargnoli ◽  
A. P. Baeta Scarpelli ◽  
L. C. T. Brito
Keyword(s):  
Standard Model ◽  
Field Strength ◽  
Mass Term ◽  
Standard Model Extension ◽  
Classical Action ◽  
Gauge Sector ◽  
Model Extension ◽  
The Standard Model ◽  
Strength Tensor

We investigate an alternative CPT-odd Lorentz-breaking QED which includes the Carroll–Field–Jackiw (CFJ) term of the Standard Model Extension (SME), writing the gauge sector in the action in a Palatini-like form, in which the vectorial field and the field-strength tensor are treated as independent entities. Interestingly, this naturally induces a Lorentz-violating mass term in the classical action. We study physical consistency aspects of the model both at classical and quantum levels.

scholarly journals New heavy gauge bosons decaying to pair of electroweak bosons: prospect studies at Run 3 and HL-LHC with ATLAS

2021 ◽  
Vol 29 (1) ◽  
pp. 15-20
Author(s):  
I. A. Serenkova ◽  
A. A. Pankov ◽  
V. A. Bednyakov
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Final States ◽  
Gauge Bosons ◽  
Data Set ◽  
Gauge Sector ◽  
Mixing Parameters ◽  
Upper Limits ◽  
Electroweak Gauge Boson ◽  
Vector Bosons

The expected ATLAS Run 3 data set with time-integrated luminosity of 300 fb-1 and HL-LHC option of the LHC with L = 3000 fb-1 in the diboson channels in semileptonic final states are used to probe a simple benchmark model with an extended gauge sector, proposed by Altarelli et al. This model accommodates new charged W' and neutral Z' vector bosons with modified trilinear Standard Model gauge couplings, decaying into electroweak gauge boson pairs WZ or WW , where W / Z decay semileptonically. We present upper limits on the mixing parameters, W - W' and Z- Z ' , by using the expected Run 3 data and HL-LHC options of the LHC.

scholarly journals SECOND-LOOP CORRECTIONS FROM SUPERHEAVY GAUGE SECTOR TO GAUGE COUPLING UNIFICATION

1999 ◽  
Vol 14 (32) ◽  
pp. 5159-5167
Author(s):  
DARIUSZ GRECH
Keyword(s):  
Standard Model ◽  
Gauge Coupling ◽  
High Energy ◽  
Matter Field ◽  
Gauge Bosons ◽  
Gauge Sector ◽  
Loop Level ◽  
Fermionic Sector ◽  
Horizontal Symmetry ◽  
The Standard Model

We deal with extensions of the Standard Model adding horizontal interactions between particle generations. We calculate two-loop corrections caused by the presence of coupling between hypothetical horizontal gauge bosons and matter field at high energy. It is shown that the coupling of such extra bosons does not affect up to two-loop level the positive features of unified and extended Standard Model with horizontal symmetry discussed in former publications. Corrections from bosonic horizontal sector make up about tenth part of those caused by fermionic sector. Although small, they are larger than the accuracy of some electroweak measurements and therefore they might be important for future verification of various proposed horizontal models.

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