Anomalous gauge boson interactions

Aihara, H.; Barklow, T.; Baur, U.

doi:10.2172/93563

Cited by 13 publications

(25 citation statements)

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“…For what concerns the quantitative theoretical predictions for each of these neutral couplings, very little has been said up to now [5,6,7,8], in contrary to the of the charged (ZW W and γW W ) self-couplings for which several types of predictions had been given since a long time [9,10,11]. A reappraisal of the theoretical expectations for these neutral couplings, is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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New and standard physics contributions to anomalous Z and γ self-couplings

2000

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We examine the Standard and the New Physics (NP) contributions to the ZZZ, ZZγ and Zγγ neutral gauge couplings. At the one-loop level, if we assume that there is no CP violation contained in NP beyond the Standard Model one, we find that only CP conserving neutral gauge couplings are generated, either from the standard quarks and leptons, or from possible New Physics (NP) fermions. Bosonic one-loop diagrams never contribute to these couplings, while the aforementioned fermionic contributions satisfyWe also study examples of two-loop NP effects that could generate non vanishing h γ,Z 4 couplings. We compare quantitative estimates from SM, MSSM and some specific examples of NP contributions, and we discuss their observability at future colliders.

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Section: Introductionmentioning

confidence: 99%

“…≃ m 2 Z ) among the multiplets; like e.g. between the heavy lepton and the heavy quark doublets, then the resulting couplings are of the order m 4 Z /M 4 F , which means that they are suppressed by an extra power m 2 Z /M 2 F as compared to (9)(10)(11). This case corresponds to a spontaneous broken SU(2) × U(1) situation.…”

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confidence: 99%

New and standard physics contributions to anomalous Z and γ self-couplings

2000

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“…In particular, they have been discussed in the context of future e + e − colliders by many authors [2,3]. There are two main differences between our present study and those that can be found in the literature.…”

Section: Introductionmentioning

confidence: 59%

“…Expected bounds from LEP II with √ s = 190 GeV and Ldt = 500 pb Studies for the LHC (with √ s = 14 TeV and integrated luminosity 100 fb −1 ) have found [3] a sensitivity to L 9L of order 10.…”

Section: Discussionmentioning

confidence: 98%

“…, 3 Recall that we only use the channel that allows a complete reconstruction of the W W pair. 4 There are several ways for such data modelling: a) application of the analytical SM expressions to represent "experimental" distributions, see, for example, [19]; b) Monte-Carlo simulation of the experimental distributions according to the SM predictions taking into account a probabilistic spread, see, for example [20,21].…”

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Study of anomalous couplings at a 500 GeVe+e−
Likhoded
¹
,
Han
²
,
Valencia
³

1996
Phys. Rev. D
6
0
2
0
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We consider the possibility of observing deviations from the Standard Model gauge-boson self-couplings at a future 500 GeV e + e − linear collider. We concentrate on the case in which the electroweak symmetry breaking sector is strongly interacting and there are no new resonances within reach of the collider. We find a sensitivity to the anomalous couplings that is two orders of magnitude higher than that achievable at LEP II. We also show how a polarized electron beam extends the reach of the collider, allowing experiments to probe different directions in parameter space.

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Measurement of the electroweak production of dijets in association with a Z-boson and distributions sensitive to vector boson fusion in proton-proton collisions at $ \sqrt{s} $ = 8 TeV using the ATLAS detector

Aad¹,

Abajyan²,

Abbott³

et al. 2014

J. High Energ. Phys.

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Measurements of fiducial cross sections for the electroweak production of two jets in association with a Z-boson are presented. The measurements are performed using 20.3 fb −1 of proton-proton collision data collected at a centre-of-mass energy of √ s = 8 TeV by the ATLAS experiment at the Large Hadron Collider. The electroweak component is extracted by a fit to the dijet invariant mass distribution in a fiducial region chosen to enhance the electroweak contribution over the dominant background in which the jets are produced via the strong interaction. The electroweak cross sections measured in two fiducial regions are in good agreement with the Standard Model expectations and the background-only hypothesis is rejected with significance above the 5σ level. The electroweak process includes the vector boson fusion production of a Z-boson and the data are used to place limits on anomalous triple gauge boson couplings. In addition, measurements of cross sections and differential distributions for inclusive Z-boson-plus-dijet production are performed in five fiducial regions, each with different sensitivity to the electroweak contribution. The results are corrected for detector effects and compared to predictions from the Sherpa and Powheg event generators. The ATLAS collaboration 40The dominant production mechanism for a leptonically decaying Z/γ * -boson 1 in association with two jets (Zjj) at the Large Hadron Collider (LHC) is via the Drell-Yan process, with the additional jets arising as a result of the strong interaction. Production of Zjj events via the t-channel exchange of an electroweak gauge boson is a purely electroweak process and is therefore much rarer. Electroweak Zjj production in the leptonic decay channel is defined to include all contributions to + − jj production for which there is a t-channel exchange of an electroweak gauge boson [1,2]. These contributions include Z-boson production via vector boson fusion (VBF), Z-boson bremsstrahlung and non-resonant production, as shown in figure 1. The VBF process is of particular interest because of the similarity to the VBF production of a Higgs boson and the sensitivity to anomalous W W Z triple gauge couplings. 2 This paper presents two measurements of Zjj production using 20.3 fb −1 of protonproton collision data collected by the ATLAS experiment [3] at a centre-of-mass energy of √ s = 8 TeV:1. Measurements of fiducial cross sections and differential distributions of inclusive Zjj production. These measurements are performed in five fiducial regions with different sensitivity to the electroweak component. Inclusive Zjj production is dominated by the strong production process, an example of which is shown in figure 2(a). The data therefore provide important constraints on the theoretical modelling of QCD-initiated processes that produce VBF-like topologies. 3 2. Observation of electroweak Zjj production and measurements of the cross section in two fiducial regions. Limits are also placed on anomalous W W Z couplings.These measurements are perfo...

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Anomalous gauge boson interactions

Cited by 13 publications

References 0 publications

New and standard physics contributions to anomalous Z and γ self-couplings

New and standard physics contributions to anomalous Z and γ self-couplings

Study of anomalous couplings at a 500 GeVe+e−
Likhoded
¹
,
Han
²
,
Valencia
³

1996
Phys. Rev. D
6
0
2
0
View full text Add to dashboard Cite

Measurement of the electroweak production of dijets in association with a Z-boson and distributions sensitive to vector boson fusion in proton-proton collisions at $ \sqrt{s} $ = 8 TeV using the ATLAS detector

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Anomalous gauge boson interactions

Cited by 13 publications

References 0 publications

New and standard physics contributions to anomalous Z and γ self-couplings

New and standard physics contributions to anomalous Z and γ self-couplings

Study of anomalous couplings at a 500 GeVe+e−Likhoded1, Han2, Valencia3 1996Phys. Rev. D6020View full textAdd to dashboardCite

Measurement of the electroweak production of dijets in association with a Z-boson and distributions sensitive to vector boson fusion in proton-proton collisions at $ \sqrt{s} $ = 8 TeV using the ATLAS detector

Contact Info

Product

Resources

About

Study of anomalous couplings at a 500 GeVe+e−
Likhoded
¹
,
Han
²
,
Valencia
³

1996
Phys. Rev. D
6
0
2
0
View full text Add to dashboard Cite