Study of anomalous couplings at a 500 GeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:ma

Likhoded, A. A.; Han, Tao; Valencia, G.

doi:10.1103/physrevd.53.4811

Cited by 6 publications

(2 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Corresponding to (26), the helicity amplitudes M (λ) have the structure shown in Tab. 1 [20], where τ and τ ′ indicate the various possible W + and W − polarizations.…”

Section: Comparison With a Model With Anomalous Gauge Couplingsmentioning

confidence: 99%

“…2 and the model considered in this section, a strategy could be the following. If a signal is observed in either σ L and/or σ R and also in at least one of the 'orthogonal' observables defined above, we can conclude that it is due to the model with anomalous gauge couplings, and we can try to derive the values of some of them by properly analyzing the observed effects [25,26]. If, conversely, only σ L and/or σ R show an effect, we are left with the possibility that both models are responsible for such deviations.…”

Section: Comparison With a Model With Anomalous Gauge Couplingsmentioning

confidence: 99%

See 1 more Smart Citation

Z′ Effects and Anomalous Gauge Couplings at Lc With Polarization

Pankov

Paver

Verzegnassi

1998

Int. J. Mod. Phys. A

View full text Add to dashboard Cite

We show that the availability of longitudinally polarized electron beams at a 500 GeV Linear Collider would allow, from an analysis of the reaction e + e − → W + W − , to set stringent bounds on the couplings of a Z ′ of the most general type. In addition, to some extent, it would be possible to disentangle observable effects of the Z ′ from analogous ones due to competitor models with anomalous trilinear gauge couplings.

show abstract

“…Corresponding to (26), the helicity amplitudes M (λ) have the structure shown in Tab. 1 [20], where τ and τ ′ indicate the various possible W + and W − polarizations.…”

Section: Comparison With a Model With Anomalous Gauge Couplingsmentioning

confidence: 99%

Section: Comparison With a Model With Anomalous Gauge Couplingsmentioning

confidence: 99%

Z′ Effects and Anomalous Gauge Couplings at Lc With Polarization

Pankov

Paver

Verzegnassi

1998

Int. J. Mod. Phys. A

View full text Add to dashboard Cite

show abstract

Effects of non-standard tri-linear couplings in photon-photon collisions (I) γγ → W+Wt-

Baillargeon¹,

Manger²,

Boudjema³

1997

Nuclear Physics B

View full text Add to dashboard Cite

The effect of anomalous couplings in γγ → W + W − is studied for different energies of the γγ mode of the next linear collider. The analysis based on the maximum likelihood method exploits the variables in the four-fermion semi-leptonic final state. Polarised differential cross sections based on the complete set of diagrams for these channels with the inclusion of anomalous couplings are used and compared to an approximation based on γγ → W + W − with full spin correlations. To critically compare these results with those obtained in e + e − we perform an analysis based on the complete calculation of the four-fermion semi-leptonic final state. The anomalous couplings that we consider are derived from the next-to-leading order operators in the non-linear realisation of symmetry breaking. quite difficult to disentangle a W W γ and a W W Z coupling at the e + e − mode, whereas obviously only the former can be probed at the γγ mode. However, as we will argue, the electroweak precision measurements at the Z peak are a sign that there should be a hierarchy of couplings whereby the symmetries one has observed at the present energies indicate that the W W γ and the W W Z should be related. If this is so, though γγ → W + W − is unique in unambiguously measuring the W W γ couplings, it is somehow probing the same parameter space as e + e − → W + W − . In such an eventuality one should then enquire about how to exploit the γγ mode, and whether the reaction γγ → W + W − can give more stringent constraints than in the e + e − mode. In addition it is useful to investigate whether one may gain by combining the results of the γγ analysis with those obtained in 1 the e + e − mode. These two aspects will be addressed in the present paper.Although there have been numerous studies that dealt with the subject of the tri-linear anomalous couplings in γγ → W + W − [11], they have all been conducted at the level of the γγ → W + W − cross section. As we will show, even if one assumes reconstruction of the helicities of the W , restricting the analysis of the γγ → W + W − at the level of the cross section, where one only accesses the diagonal elements of the W W density matrix, it is not possible to maximally enhance the effect of the anomalous couplings. Indeed, as one expects in an investigation of the Goldtsone sector, the new physics parameterised in this context by an anomalous magnetic moment of the W , ∆κ γ , affects principally the production of two longitudinal W bosons. In the γγ mode this affects predominantly the J Z = 0 amplitude by providing an enhanced coupling of the order γ = s γγ /M 2 W ( √ s γγ is the γγ centre of mass energy). Unfortunately the same standard amplitude (the J Z = 0 with two longitudinal W's) has the factor 1/γ and therefore the interference is not effective in the sense that the genuine enhanced coupling γ brought about by the new physics is washed out. This is in contrast with what happens in the e + e − mode where the interference is fully effective. Nonetheless, the enhanced coupling could still be ex...

show abstract

CPviolating anomalous couplings at a500GeVe+
Likhoded
¹
,
Valencia
²
,
Yushchenko
³

1998
Phys. Rev. D
Self Cite
5
0
3
0
View full text Add to dashboard Cite

We study the sensitivity of a 500 GeV e ϩ e Ϫ linear collider to CP violating anomalous couplings. We find that with 50 fb Ϫ1 , and taking only one non-zero coupling at a time, the process e ϩ e Ϫ →W ϩ W Ϫ can be used to place the 95% confidence level bounds ͉ ␥ ͉р0.1, ͉ Z ͉р0.1 and ͉g 4 Z ͉р0.1 from CP even observables. By studying certain distributions in the process e ϩ e Ϫ → ϩ Ϫ one of the bounds can be improved to ͉g 4 Z ͉ р0.06. This process also allows the construction of a CP odd observable which can be used to place bounds on CP violating new physics. At the 95% confidence level we find ͉ ␥ ͉р0.3, ͉ Z ͉р0.2 and a much weaker bound for ͉g 4 Z ͉.

show abstract

Study of anomalous couplings at a 500 GeVe+e−

Cited by 6 publications

References 35 publications

Z′ Effects and Anomalous Gauge Couplings at Lc With Polarization

Z′ Effects and Anomalous Gauge Couplings at Lc With Polarization

Effects of non-standard tri-linear couplings in photon-photon collisions (I) γγ → W+Wt-

CPviolating anomalous couplings at a500GeVe+
Likhoded
¹
,
Valencia
²
,
Yushchenko
³

1998
Phys. Rev. D
Self Cite
5
0
3
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Study of anomalous couplings at a 500 GeVe+e−

Cited by 6 publications

References 35 publications

Z′ Effects and Anomalous Gauge Couplings at Lc With Polarization

Z′ Effects and Anomalous Gauge Couplings at Lc With Polarization

Effects of non-standard tri-linear couplings in photon-photon collisions (I) γγ → W+Wt-

CPviolating anomalous couplings at a500GeVe+Likhoded1, Valencia2, Yushchenko3 1998Phys. Rev. DSelf Cite5030View full textAdd to dashboardCite

Contact Info

Product

Resources

About

CPviolating anomalous couplings at a500GeVe+
Likhoded
¹
,
Valencia
²
,
Yushchenko
³

1998
Phys. Rev. D
Self Cite
5
0
3
0
View full text Add to dashboard Cite