CP-violating anomalous WWγ couplings in e+e− collisions

We present a systematic interpretation of vector boson scattering (VBS) and diboson measurements from the LHC in the framework of the dimension-six standard model effective field theory (SMEFT). We consider all available measurements of VBS fiducial cross-sections and differential distributions from ATLAS and CMS, in most cases based on the full Run II luminosity, and use them to constrain 16 independent directions in the dimension-six EFT parameter space. Compared to the diboson measurements, we find that VBS provides complementary information on several of the operators relevant for the description of the electroweak sector. We also quantify the ultimate EFT reach of VBS measurements via dedicated projections for the high luminosity LHC. Our results motivate the integration of VBS processes in future global SMEFT interpretations of particle physics data.

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“…and whose presence leads to CP-violating effects which are potentially observable in the electroweak sector [76][77][78][79][80].…”

Section: Theoretical Frameworkmentioning

confidence: 99%

SMEFT analysis of vector boson scattering and diboson data from the LHC Run II

et al. 2021

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“…There are a lot of phenomenological studies for W W γ interactions at the linear and hadron colliders [4][5][6][7][8][9][10][11]. The experimental sensitivity limits on anomalous W W γ couplings ∆κ = κ − 1 and λ are obtained by the LEP [12], Tevatron [13] and LHC [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Anomalous WWγ couplings with beam polarization at the Compact Linear Collider

et al. 2016

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We study the anomalous W W γ couplings at the Compact Linear Collider through the processes e + e is the Weizsacker-Williams photon). We give the 95% confidence level limits for unpolarized and polarized electron (positron) beam on the anomalous couplings for various values of the integrated luminosities and center-of-mass energies. We show that the obtained limits on the anomalous couplings through these processes can highly improve the current experimental limits. In addition, our limits with beam polarization are approximately two times better than the unpolarized case.Hereκ, λ are the dimensionless anomalous parameters. They are related to magnetic dipole and electric quadrupole moments of W boson. In the SM, the couplings are obtained g γ 1 = 1, κ = 1 and λ = 0 at the tree level. The g γ 1 = 1 value is fixed for on-shell photons at tree level by electromagnetic gauge invariance to its SM value. Then, the Feynman rule for the anomalous vertex can be found from Eq.(1),

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“…The CP conserving operators have been studied in great detail [3], and the bounds on these parameters have been analyzed (see e.g., LEP studies in [4]). The CP-violating operators have also been studied at colliders [5,6], but the bounds are only at best ∼ 0.1. The DELPHI Collaboration [6] used the process e + e − → W + W − → lνq q(l = e/µ) to obtain the measurements…”

Section: Cp Violation In the Wwz Triple Gauge Couplingsmentioning

confidence: 99%

ProbingCP-violation at colliders through interference effects in diboson production and decay

2008

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We define a CP-asymmetric observable that is sensitive to CP-violating interactions in the gaugeboson sector. We illustrate the utility of this observable by studying how well the LHC can measure the coefficient of a particular dimension-six W W Z operator. We find that sensitivity at the 10 −3 level is possible at the LHC with 100 fb −1 of integrated luminosity, which would greatly exceed the sensitivity achieved at LEP, and would rival or may even better the indirect sensitivities inferred from related operators constrained by electric dipole moment experiments.

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CP-violating anomalous WWγ couplings in e+e− collisions

Cited by 22 publications

References 24 publications

SMEFT analysis of vector boson scattering and diboson data from the LHC Run II

SMEFT analysis of vector boson scattering and diboson data from the LHC Run II

Anomalous WWγ couplings with beam polarization at the Compact Linear Collider

ProbingCP-violation at colliders through interference effects in diboson production and decay

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