New physics effects in trilinear electroweak gauge boson couplings

2006 ◽  
Author(s):  
J. J. Toscano
Keyword(s):  
Gauge Boson ◽  
New Physics ◽  
Electroweak Gauge Boson ◽  
Gauge Boson Couplings

scholarly journals Electroweak gauge-boson production in association with b jets at Hadron Colliders

2015 ◽  
Vol 30 (16) ◽  
pp. 1530042 ◽  
Author(s):  
F. Febres Cordero ◽  
L. Reina
Keyword(s):  
Large Hadron Collider ◽  
Gauge Boson ◽  
Hadron Collider ◽  
New Physics ◽  
Distribution Functions ◽  
Experimental Measurements ◽  
Cern Large Hadron Collider ◽  
Electroweak Gauge Boson ◽  
Theoretical Predictions ◽  
B Quark

The production of both charged and neutral electroweak gauge bosons in association with b jets has attracted a lot of experimental and theoretical attention in recent years because of its central role in the physics programs of both the Fermilab Tevatron and the CERN Large Hadron Collider. The improved level of accuracy achieved both in the theoretical predictions and experimental measurements of these processes can promote crucial developments in modeling b-quark jets and b-quark parton distribution functions, and can provide a more accurate description of some of the most important backgrounds to the measurement of Higgs-boson couplings and several new physics searches. In this paper, we review the status of theoretical predictions for cross sections and kinematic distributions of processes in which an electroweak gauge boson is produced in association with up to two b jets in hadronic collisions, namely [Formula: see text], pp → V + 1b jet and [Formula: see text], pp → V + 2b jets with V = W±, Z/γ*, γ. Available experimental measurements at both the Fermilab Tevatron and the CERN Large Hadron Collider are also reviewed and their comparison with theoretical predictions is discussed.

scholarly journals New physics contribution to neutral trilinear gauge boson couplings

2009 ◽  
Vol 63 (2) ◽  
pp. 305-315 ◽  
Author(s):  
Sukanta Dutta ◽  
Ashok Goyal ◽  
Mamta
Keyword(s):  
Gauge Boson ◽  
New Physics ◽  
Gauge Boson Couplings

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 Flavour Anomalies in a U(1) SUSY Extension of the SM

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 191
Author(s):  
Alexander Bednyakov ◽  
Alfiia Mukhaeva
Keyword(s):  
Standard Model ◽  
Parameter Space ◽  
Gauge Boson ◽  
New Physics ◽  
Low Energy ◽  
Effective Theory ◽  
The Standard Model ◽  
Meson Mixing ◽  
Additional Anomaly ◽  
Lepton Flavour

Flavour anomalies have attracted a lot of attention over recent years as they provide unique hints for possible New Physics. Here, we consider a supersymmetric (SUSY) extension of the Standard Model (SM) with an additional anomaly-free gauge U(1) group. The key feature of our model is the particular choice of non-universal charges to the gauge boson Z′, which not only allows a relaxation of the flavour discrepancies but, contrary to previous studies, can reproduce the SM mixing matrices both in the quark and lepton sectors. We pay special attention to the latter and explicitly enumerate all parameters relevant for our calculation in the low-energy effective theory. We find regions in the parameter space that satisfy experimental constraints on meson mixing and LHC Z′ searches and can alleviate the flavour anomalies. In addition, we also discuss the predictions for lepton-flavour violating decays B+→K+μτ and B+→K+eτ.

scholarly journals Measurement of triple-gauge-boson couplings of the W boson at LEP

2004 ◽  
Vol 586 (3-4) ◽  
pp. 151-166 ◽  
Author(s):  
P. Achard ◽  
O. Adriani ◽  
M. Aguilar-Benitez ◽  
J. Alcaraz ◽  
G. Alemanni ◽  
...  
Keyword(s):  
Gauge Boson ◽  
W Boson ◽  
Gauge Boson Couplings

scholarly journals Limits on anomalous trilinear gauge boson couplings from WW, WZ and Wγ production in pp¯ collisions at s=1.96 TeV

2012 ◽  
Vol 718 (2) ◽  
pp. 451-459 ◽  
Author(s):  
V.M. Abazov ◽  
B. Abbott ◽  
B.S. Acharya ◽  
M. Adams ◽  
T. Adams ◽  
...  
Keyword(s):  
Gauge Boson ◽  
Gauge Boson Couplings
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