Gauge boson pair production at the LHC: Anomalous couplings and vector boson scattering

Kuss, I.; Nuss, E.

doi:10.1007/s100520050234

Cited by 5 publications

(10 citation statements)

References 38 publications

(125 reference statements)

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“…Finally we have defined effective TGCs in the scheme P W which allow a direct comparison of the ELb, ELa and FF approaches for e + e − → W W . An extensive study [23] has discussed the measurement of the γW W and ZW W couplings at the LHC. Using events with a W ± Z (W ± γ) pair in the final state one is sensitive only to the ZW W (γW W ) couplings in Drell-Yan-type production, and therefore the two groups of couplings can be measured separately.…”

Section: Discussionmentioning

confidence: 99%

“…Thus any observed deviations from these SM values would have drastic consequences for the structure of the theory. Gauge-boson couplings can be studied at the LHC [23][24][25] and with high precision at a future LC like TESLA [26][27][28], NLC [8], JLC [29] or CLIC [30]. There W pair production, e + e − → W W , is suitable to measure TGCs.…”

Section: Introductionmentioning

confidence: 99%

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Anomalous gauge-boson couplings and the Higgs-boson mass

Nachtmann

Nagel²,

Pospischil³

2005

Eur. Phys. J. C

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We study anomalous gauge-boson couplings induced by a locally SU(2) × U(1) invariant effective Lagrangian containing ten operators of dimension six built from boson fields of the Standard Model (SM) before spontaneous symmetry breaking (SSB). After SSB some operators lead to new three-and four-gauge-boson interactions, some contribute to the diagonal and off-diagonal kinetic terms of the gauge bosons, to the kinetic term of the Higgs boson and to the mass terms of the W and Z bosons. This requires a renormalisation of the gauge-boson fields, which, in turn, modifies the chargedand neutral-current interactions, although none of the additional operators contain fermion fields. Also the Higgs field must be renormalised. Bounds on the anomalous couplings from electroweak precision measurements at LEP and SLC are correlated with the Higgs-boson mass m H . Rather moderate values of anomalous couplings allow m H up to 500 GeV. At a future linear collider the triple-gauge-boson couplings γW W and ZW W can be measured in the reaction e + e − → W W . We compare three approaches to anomalous gauge-boson couplings: the form-factor approach, the addition of anomalous coupling terms to the SM Lagrangian after and, as outlined above, before SSB. The translation of the bounds on the couplings from one approach to another is not straightforward. We show that it can be done for the process e + e − → W W by defining new effective γW W and ZW W couplings.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anomalous gauge-boson couplings and the Higgs-boson mass

Nachtmann

Nagel²,

Pospischil³

2005

Eur. Phys. J. C

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“…The impact of potential non-SM triple-gauge-boson interactions has been considered at LO in Refs. [75][76][77][78][79][80] and at NLO QCD in Refs. [81,82,31].…”

Section: Introductionmentioning

confidence: 99%

Anomalous triple-gauge-boson interactions in vector-boson pair production with Recola2

2018

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Diboson production at the LHC is a process of great importance both in the context of tests of the SM and for direct searches for new physics. In this paper we present a phenomenological study of WW (→ e + ν e μ −ν μ ), WZ (→ e − ν e μ + μ − ), and ZZ (→ e + e − μ + μ − ) production considering event selections of interest for the anomalous triplegauge-boson-coupling searches at the LHC: we provide theoretical predictions within the Standard Model at NLO QCD and NLO EW accuracy and study the effect of the anomalous triple-gauge-boson interactions at NLO QCD. For WW and ZZ the contribution of the loop-induced gg → W + W − and gg → ZZ processes is included. Anomalous triple-gaugeboson interactions are parametrized in the EFT framework. This paper is the first application of Recola2 in the EFT context.

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“…• direct effects in e + e − → W + W − constrained by LEP2 and LC measurements [9]; and also from W + W − , W γ, W Z production at the hadron colliders TEVATRON and LHC [10].…”

Section: The Dim = 6 Operators Inducing Anomalous Higgs Couplingsmentioning

confidence: 99%

Tests of Higgs boson couplings at aμ+μ−collider

Gounaris

Renard

1999

Phys. Rev. D

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We investigate the potential of a muon collider for testing the presence of anomalous Higgs boson couplings. We consider the case of a light (less than 160 GeV ) Higgs boson and study the effects on the Higgs branching ratios and total width, which could be induced by the non standard couplings created by a class of dim = 6 SU(3) × SU(2) × U(1) gauge invariant operators satisfying the constraints imposed by the present and future hadronic and e − e + colliders. For each operator we give the minimal value of the µ + µ − integrated luminosity needed for the muon collider (µC) to improve these constraints. Depending on the operator and the Higgs mass, this minimal µC luminosity lies between 0.1 f b −1 and 100 f b −1 .One of the main goals of a future µ + µ − Collider (µC), is to provide a Higgs boson factory [1]. It has been shown that with a good energy resolution (of the order of 0.003%) and a reasonable integrated luminosity (of the order of the f b −1 ), the mass and the total width and branching ratios of a light Higgs boson can be directly measured with a high accuracy [2]. In particular, the measurement of the mass and the total width, is the unique feature of a µC [3]. In addition, the branching ratios can be more accurately measured than at a Linear e + e − Collider (LC), as long as m H 160 GeV ; i.e. as long as the total width Γ H is sufficiently small, so that the peak of the µ + µ − → H cross section is enhanced, and a large number of events is produced [2,4].The aim of the present paper is to discuss more precisely the potential of a µ + µ − collider for the search of anomalous Higgs boson couplings. We assume that only a single light (i.e. m H 160 GeV ) standard-like Higgs boson exists. Moreover, we assume that this Higgs boson may have anomalous couplings which can be generated by adding to the Standard Model (SM) lagrangian L SM , a set of new physics (NP) terms associated to a high scale Λ, lying in the several TeV range. These NP terms are expressed in terms of all possible dim = 6 SU(3) × SU(2) × U(1) gauge invariant operators O i involving the various standard model fields and contributing with couplings g i ef f , [5,6,7]. Thus, the contributions of each of these operators on the partial decay widths Γ(H → F ), are determined by g i ef f . Constraints on these coupling constants have already been established from the effects of the aforementioned operators in the gauge sector (at LEP1/SLC, LEP2 and TEVATRON) [8,9,10]. These constraints will be improved by further TEVATRON studies [11], as well as studies at LHC [12] and LC [13] (anticipated to run before the µC), in particular through the direct production of the Higgs boson. For each operator we collect the most stringent constraint on the associated coupling constant g i ef f that should be available by that time. We mention separately the constraints that could be obtained from the study of the Hγγ couplings, if the γγ mode at a Linear Collider will also be available [14,15].Taking the accuracy at which a µC can measure the Higgs total and pa...

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Gauge boson pair production at the LHC: Anomalous couplings and vector boson scattering

Cited by 5 publications

References 38 publications

Anomalous gauge-boson couplings and the Higgs-boson mass

Anomalous gauge-boson couplings and the Higgs-boson mass

Anomalous triple-gauge-boson interactions in vector-boson pair production with Recola2

Tests of Higgs boson couplings at aμ+μ−collider

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