scholarly journals Remarks on an Anomalous Triple Gauge Boson Couplings

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Patricio Gaete ◽  
J. A. Helayël-Neto ◽  
L. P. R. Ospedal
Keyword(s):  
Gauge Boson ◽  
Wilson Loop ◽  
Higgs Mechanism ◽  
Linear Potential ◽  
Gauge Invariant ◽  
Physical Observable ◽  
The Standard Model ◽  
Electroweak Sector ◽  
Path Dependent ◽  
Gauge Boson Couplings

We address the effect of an anomalous triple gauge boson couplings on a physical observable for the electroweak sector of the Standard Model, when the S U 2 L ⊗ U 1 Y symmetry is spontaneously broken by the Higgs mechanism to U 1 e m . Our calculation is done within the framework of the gauge-invariant, but path-dependent variable formalism is an alternative to the Wilson loop approach. Our result shows that the interaction energy is the sum of a Yukawa and a linear potential, leading to the confinement of static probe charges. The point we wish to emphasize, however, is that the anomalous triple gauge boson couplings ( Z γ γ ) contributes to the confinement for distances on the intranuclear scale.

scholarly journals COULOMB'S LAW CORRECTIONS FROM A GAUGE-KINETIC MIXING

2011 ◽  
Vol 26 (05) ◽  
pp. 863-871 ◽  
Author(s):  
PATRICIO GAETE ◽  
IVÁN SCHMIDT
Keyword(s):  
Standard Model ◽  
Coulomb Potential ◽  
Wilson Loop ◽  
Quantum Potential ◽  
Gauge Invariant ◽  
Hidden Sector ◽  
The Standard Model ◽  
Dependent Variables ◽  
Path Dependent ◽  
Coulomb's Law

We study the connection or equivalence between two well-known extensions of the Standard Model, that is, for the coupling between the familiar massless electromagnetism U (1) QED and a hidden-sector U (1)h, and axionic electrodynamics. Our discussion is carried out using the gauge-invariant but path-dependent variables formalism, which is an alternative to the Wilson loop approach. When we compute in this way the static quantum potential for the coupling between the familiar massless electromagnetism U (1) QED and a hidden-sector U (1)h, the result of this calculation is a Yukawa correction to the usual static Coulomb potential. Previously,14, we have shown that axionic electrodynamics has a different structure which is reflected in a confining piece. Therefore, both extensions of the Standard Model are not equivalent. Interestingly, when the above calculation is done inside a superconducting box, the Coulombic piece disappears leading to a screening phase.

Anomalies, instantons and axions

2018 ◽  
Author(s):  
Michael Kachelriess
Keyword(s):  
Standard Model ◽  
Path Integral ◽  
Electric Charge ◽  
Gauge Invariant ◽  
Axial Anomaly ◽  
Yang Mills ◽  
Integral Measure ◽  
The Standard Model ◽  
Electroweak Sector

The axial anomaly is derived both from the non-invariance of the path-integral measure under UA(1) transformations and calculations of specific triangle diagrams. It is demonstrated that the anomalous terms are cancelled in the electroweak sector of the standard model, if the electric charge of all fermions adds up to zero. The CP-odd term F̃μν‎Fμν‎ introduced by the axial anomaly is a gauge-invariant renormalisable interaction which is also generated by instanton transitions between Yang–Mills vacua with different winding numbers. The Peceei–Quinn symmetry is discussed as a possible explanation why this term does not contribute to the QCD action.

scholarly journals Trilinear gauge boson couplings in the standard model with one universal extra dimension

2013 ◽  
Vol 88 (1) ◽  
Author(s):  
M. A. López-Osorio ◽  
E. Martínez-Pascual ◽  
J. Montaño ◽  
H. Novales-Sánchez ◽  
J. J. Toscano ◽  
...  
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Extra Dimension ◽  
Universal Extra Dimension ◽  
The Standard Model ◽  
Gauge Boson Couplings

INDIRECT CONSTRAINTS ON THE TRIPLE GAUGE BOSON COUPLINGS FROM $\bm{Z\to b{\bar b}}$ PARTIAL WIDTH: AN UPDATE

2000 ◽  
Vol 15 (01) ◽  
pp. 1-7 ◽  
Author(s):  
O. J. P. ÉBOLI ◽  
M. C. GONZALEZ-GARCIA ◽  
S. F. NOVAES
Keyword(s):  
Gauge Boson ◽  
Partial Width ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Present Value ◽  
Triple Gauge Couplings ◽  
The Standard Model ◽  
Model Predictions ◽  
Anomalous Triple Gauge Couplings ◽  
Gauge Boson Couplings

We update the indirect bounds on anomalous triple gauge couplings coming from the non-universal one-loop contributions to the [Formula: see text] width. These bounds, which are independent of the Higgs boson mass, are in agreement with the standard model predictions for the gauge boson self-couplings since the present value of Rb agrees fairly well with the theoretical estimates. Moreover, these indirect constraints on [Formula: see text] and [Formula: see text] are most stringent than the present direct bounds on these quantities, while the indirect limit on λZ is weaker than the available experimental data.

scholarly journals Remarks on the Static Potential Driven by Vacuum Nonlinearities in D=3 Models

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Patricio Gaete ◽  
José A. Helayël-Neto
Keyword(s):  
Interaction Energy ◽  
Long Range ◽  
Coulomb Potential ◽  
Potential Profile ◽  
Linear Potential ◽  
Static Potential ◽  
Generalized Born ◽  
Gauge Invariant ◽  
Dependent Variables ◽  
Path Dependent

Within the framework of the gauge-invariant, but path-dependent, variables formalism, we study the manifestations of vacuum electromagnetic nonlinearities in D=3 models. For this we consider both generalized Born-Infeld and Pagels-Tomboulis-like electrodynamics, as well as Euler-Heisenberg-like electrodynamics. We explicitly show that generalized Born-Infeld and Pagels-Tomboulis-like electrodynamics are equivalent, where the static potential profile contains a long-range (1/r2-type) correction to the Coulomb potential. Interestingly enough, for Euler-Heisenberg-like electrodynamics the interaction energy contains a linear potential, leading to the confinement of static charges.

scholarly journals PRECISION SUPERSYMMETRY MEASUREMENTS AT THE e-e- COLLIDER

1998 ◽  
Vol 13 (14) ◽  
pp. 2329-2336 ◽  
Author(s):  
HSIN-CHIA CHENG
Keyword(s):  
Standard Model ◽  
High Precision ◽  
Gauge Boson ◽  
Linear Collider ◽  
Direct Detection ◽  
Precision Measurements ◽  
Supersymmetric Particle ◽  
The Standard Model ◽  
Electroweak Sector ◽  
Future Linear Collider

Measurements of supersymmetric particle couplings provide important verification of supersymmetry. If some of the superpartners are at the multi-TeV scale, they will escape direct detection at planned future colliders. However, such particles induce nondecoupling corrections in processes involving the accessible superparticles through violations of the supersymmetric equivalence between gauge boson and gaugino couplings. These violations are analogous to the oblique corrections in the electroweak sector of the Standard Model, and can be parametrized in terms of super-oblique parameters. The e-e- collision mode of a future linear collider is shown to be an excellent environment for such high precision measurements of these SUSY parameters, which will provide an important probe of superparticles beyond reachable energies.

scholarly journals Elastic positivity vs extremal positivity bounds in SMEFT: a case study in transversal electroweak gauge-boson scatterings

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Kimiko Yamashita ◽  
Cen Zhang ◽  
Shuang-Yong Zhou
Keyword(s):  
Field Theory ◽  
Gauge Boson ◽  
Precise Determination ◽  
Effective Field ◽  
Quantum Numbers ◽  
Electroweak Gauge Boson ◽  
The Standard Model ◽  
Gauge Boson Couplings

Abstract The positivity bounds, derived from the axiomatic principles of quantum field theory (QFT), constrain the signs of Wilson coefficients and their linear combinations in the Standard Model Effective Field Theory (SMEFT). The precise determination of these bounds, however, can become increasingly difficult as more and more SM modes and oper- ators are taken into account. We study two approaches that aim at obtaining the full set of bounds for a given set of SM fields: 1) the traditional elastic positivity approach, which exploits the elastic scattering amplitudes of states with arbitrarily superposed helicities as well as other quantum numbers, and 2) the newly proposed extremal positivity approach, which constructs the allowed coefficient space directly by using the extremal representation of convex cones. Considering the electroweak gauge-bosons as an example, we demonstrate how the best analytical and numerical positivity bounds can be obtained in several ways. We further compare the constraining power and the efficiency of various approaches, as well as their applicability to more complex problems. While the new extremal approach is more constraining by construction, we also find that it is analytically easier to use, nu- merically much faster than the elastic approach, and much more applicable when more SM particle states and operators are taken into account. As a byproduct, we provide the best positivity bounds on the transversal quartic-gauge-boson couplings, required by the axiomatic principles of QFT, and show that they exclude ≈ 99.3% of the parameter space currently being searched at the LHC.

scholarly journals Recent observation and measurements of diboson processes from the ATLAS experiment

2020 ◽  
Vol 35 (28) ◽  
pp. 2030013
Author(s):  
Yee Chinn Yap
Keyword(s):  
Recent Observation ◽  
Production Cross ◽  
New Physics ◽  
Inclusive Production ◽  
Centre Of Mass ◽  
Atlas Experiment ◽  
The Standard Model ◽  
Electroweak Sector ◽  
Two Jets ◽  
Gauge Boson Couplings

This review covers results at a centre-of-mass energy of [Formula: see text] TeV from the ATLAS experiment that have been published, or submitted for publication, up to April 2020. It summarizes results on the inclusive production cross-section measurements of boson pairs and of the electroweak production of diboson in association with two jets. The measurements either use the full integrated luminosity of 139 fb[Formula: see text] collected by the ATLAS detector at the LHC from 2015 to 2018, or a partial dataset of 36 fb[Formula: see text]. The inclusive production rates of diboson are studied to high precision. These measurements provide stringent tests of the electroweak sector of the Standard Model and allow search for new physics via anomalous triple and quartic gauge boson couplings.

scholarly journals TRILINEAR NEUTRAL GAUGE BOSON COUPLINGS

2001 ◽  
Vol 16 (30) ◽  
pp. 4891-4909 ◽  
Author(s):  
DEBAJYOTI CHOUDHURY ◽  
SUKANTA DUTTA ◽  
SUBHENDU RAKSHIT ◽  
SAURABH RINDANI
Keyword(s):  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Minimal Supersymmetric Standard Model ◽  
Gauge Boson ◽  
Form Factors ◽  
Neutral Gauge Boson ◽  
The Standard Model ◽  
Vector Bosons ◽  
Gauge Boson Couplings

We study the CP even trilinear neutral gauge boson vertices at one-loop in the context of the Standard Model and the Minimal Supersymmetric Standard Model, assuming two of the vector bosons are on-shell. We also study the changes in the form-factors when these two bosons are off-shell.

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