Tests of anomalous quartic couplings at the Next Linear Collider

Éboli, O. J. P.; Gonzalez-Garcia, M. C.; Mizukoshi, J. K.

doi:10.1103/physrevd.58.034008

Cited by 51 publications

(84 citation statements)

References 30 publications

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“…Typical signatures of "new physics", such as strong electroweak symmetry breaking, show up as enhancements over the predicted Standard Model production rates in the cross sections for EW qq → qqV V production at high center-of-mass energies. Accurate predictions for EW V V jj production are therefore needed not only in estimates of backgrounds to the Higgs signal in VBF, but also for the search of physics beyond the Standard Model [6].…”

Section: Introductionmentioning

confidence: 99%

Next-to-leading-order QCD corrections toW+ZandW−Zproduction via vector-boson fusion

Bozzi¹,

Jäger²,

Oleari³

et al. 2007

Phys. Rev. D

106

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We present the calculation of the next-to-leading order QCD corrections to electroweak pp → e + ν e µ + µ − jj and pp → e −ν e µ + µ − jj production at the CERN LHC in the form of a fully flexible parton-level Monte Carlo program. The QCD corrections to the total cross sections are modest, changing the leading-order results by less than 10%. At the Born level, the shape of kinematic distributions can depend significantly on the choice of factorization scale. This theoretical uncertainty is strongly reduced by the inclusion of the next-to-leading order QCD corrections.

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Section: Introductionmentioning

confidence: 99%

Next-to-leading-order QCD corrections toW+ZandW−Zproduction via vector-boson fusion

Bozzi¹,

Jäger²,

Oleari³

et al. 2007

Phys. Rev. D

106

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show abstract

“…Nonetheless, this b r P P value (when combined with the b r M and b r F values in Table I) is consistent with the b r P P value in Eq. (21). For N f = 6, the data is even closer to the LO dashed line, suggesting that NLO perturbation theory in the form of Eq.…”

Section: Scattering Resultsmentioning

confidence: 58%

“…Comparison with the α 4 and α 5 employed by Eboli et al [21] requires the inclusion of standard-model corrections not considered here. Then the above log(M 2 dd ) dependence can be separated and incorporated into these corrections (allowing the limit M dd → 0 to be taken there) since the resultant NGBs are eaten by the W and Z.…”

Section: Arxiv:12013977v1 [Hep-lat] 19 Jan 2012 Electroweak Chiral Lmentioning

confidence: 99%

“…In Ref. [21], Eboli et al found that with an integrated luminosity of 100 fb −1 , and by considering both W and Z scattering, the LHC could place 99% CL bounds −7.7 × 10 −3 < α 4 < 15 × 10 −3 and −12 × 10 −3 < α 5 < 10×10 −3 . Because the fit to potential LHC data was made using only the terms of Eq.…”

Section: Arxiv:12013977v1 [Hep-lat] 19 Jan 2012 Electroweak Chiral Lmentioning

confidence: 99%

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WWscattering parameters via pseudoscalar phase shifts

et al. 2012

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Using domain-wall lattice simulations, we study pseudoscalar-pseudoscalar scattering in the maximal isospin channel for an SU (3) gauge theory with two and six fermion flavors in the fundamental representation. This calculation of the S-wave scattering length is related to the next-to-leading order corrections to WW scattering through the low-energy coefficients of the chiral Lagrangian. While two and six flavor scattering lengths are similar for a fixed ratio of the pseudoscalar mass to its decay constant, six-flavor scattering shows a somewhat less repulsive next-to-leading order interaction than its two-flavor counterpart. Estimates are made for the WW scattering parameters and the plausibility of detection is discussed.

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“…This has been discussed most recently in [9] by comparing cross sections with and without the operator controlled by the corresponding coefficient. They consider scattering of W + W − , W ± Z and ZZ (W ± W ± gives somewhat weaker bounds) and report limits (at 99% CL) that we take here to be…”

Section: Lhc Sensitivitymentioning

confidence: 99%

Possible experimental signatures at the CERN LHC of strongly interacting electroweak symmetry breaking

Fabbrichesi

Vecchi

2007

Phys. Rev. D

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If electro-weak symmetry is broken by a new strongly interacting sector, new physics will probably manifest itself in gauge boson scattering at the LHC. The relevant dynamics is well described in terms of an effective lagrangian. We discuss the probable size of the coefficients of the relevant operators under a combination of model-independent constraints and reasonable assumptions based on two models of the strongly interacting sector. We compare these values with LHC sensitivity and argue that they will be too small to be seen. Therefore, the presence of vector and scalar resonances required by unitarity will be the only characteristic signature. We analyze the most likely masses and widths of these resonances.PACS numbers: 11.15. Ex,12.39.Fe,12.60.Fr,12.60.Nz I. MOTIVATIONSIf the breaking of the electro-weak symmetry is due to a new and strongly interacting sector, it is quite possible that the LHC will not discover any new fundamental particle below the scale of 2 TeV. In this scenario-in which there is no SUSY and no light (fundamental or composite) Higgs boson to be seen-it becomes particularly relevant to analyze the physics of gauge boson scattering-W W , W Z and ZZ-because it is here that the strongly interacting sector should manifest itself most directly.Gauge boson scattering in this regime looks similar in many ways to ππ scattering in QCD and similar techniques can be used. The natural language is that of the effective electro-weak lagrangian introduced in [1]. This lagrangian contains all dimension four operators for the propagation and interaction of the Goldstone bosons of the breaking of the global SU (2) × U (1) symmetry. If we knew the coefficients of these operators we could predict the physics of gauge boson scattering at the LHC. Unfortunately the crucial coefficients do not enter directly in currently measured observables. We do not know their values and constraints on them can only be inferred by their effect in small loop corrections to the EW observables. Accordingly they are rather weak. In addition, even though the LHC will explore these terms directly, its sensitivity is not as good as we would like it to be and an important range of values will remain unexplored.This lack of predictive power can be ameliorated if we assume some model of the strong dynamics responsible of the electro-weak symmetry breaking. In this case, additional relations among the coefficients can be found and used to relate them to known constraints. Our strategy is therefore to use our prejudices-that is, model-dependent relationships among the coefficients of the effective lagrangian-plus general constraints coming from causality and analyticity of the amplitudes to see what values the relevant coefficients of the effective electro-weak lagrangian can assume without violating any of the current bounds.We are aware that in many models the relations among the coefficients we utilize can be made weaker and therefore our bounds will not apply. Nevertheless we find it useful to be as conservative as possible a...

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Tests of anomalous quartic couplings at the Next Linear Collider

Cited by 51 publications

References 30 publications

Next-to-leading-order QCD corrections toW+ZandW−Zproduction via vector-boson fusion

Next-to-leading-order QCD corrections toW+ZandW−Zproduction via vector-boson fusion

WWscattering parameters via pseudoscalar phase shifts

Possible experimental signatures at the CERN LHC of strongly interacting electroweak symmetry breaking

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