Unitarity constraints on top quark signatures of Higgsless models

Schwinn, Christian

doi:10.1103/physrevd.71.113005

Cited by 16 publications

(18 citation statements)

References 61 publications

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“…As in the gauge boson sector [10], unitarity SRs can be used to constrain signatures of the Higgsless mechanism in the_top sector [ 11]. In the 4D SM without a Higgs, the scattering amplitude for W + W~ -> it grows like y/s.…”

Section: Unitarity Constraints On Top Signaturesmentioning

confidence: 99%

“…To obtain estimates for the couplings, in [11] the SRs from W + W~ -> tt, WZ -> tb and ZZ -> tt were solved under the assumption of saturation by the first KK-level and non-degenerate KK-modes. For the example of equal left-and right handed couplings of the KK-modes and non-anomalous zero mode couplings one obtains the estimates …”

Section: Unitarity Constraints On Top Signaturesmentioning

confidence: 99%

“…The production of heavy top quarks in W-b fusion qb -> q'T at the LHC has been studied in the context of Little Higgs models [17] where the relevant coupling is given ~^2nrfX^-^o r^1 -fa, the reach of the LHC has been estimated [17] asmr -2 TeV Comparing to the result analogous to (3) for g WT (i) b [11] one can approximately relate the cross sections in the Littlest Higgs model and in the Higgsless scenario as aMWb^T^^^^) 2 aMWb^T)^0.n^^) 2 aMWb^T) (5) so the phenomenology of the T^-1 ' will be even more challenging in the Higgsless model. For a light T^ as in [14], QCD pair production is the dominant signal [17].…”

Section: Implications For Phenomenologymentioning

confidence: 99%

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Top quark signatures of Higgsless models

Schwinn

2007

AIP Conference Proceedings

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In these proceedings I describe the use of tree level unitarity to constrain top quark signatures of Higgsless electroweak models and discuss implications for collider phenomenology.Comment: 5 pages, 3 figures, aipproc style. To appear in the proceedings of SUSY06, 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, USA 12-17 June 200

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Section: Unitarity Constraints On Top Signaturesmentioning

confidence: 99%

Section: Unitarity Constraints On Top Signaturesmentioning

confidence: 99%

Section: Implications For Phenomenologymentioning

confidence: 99%

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Top quark signatures of Higgsless models

Schwinn

2007

AIP Conference Proceedings

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“…General constraints on couplings in Higgsless models from this and related processes have been considered previously in Ref. [39]. In the SM, the tree-level…”

Section: Unitarity Constraintsmentioning

confidence: 99%

An effective Higgsless theory: Satisfying electroweak constraints and a heavy top quark

Foadi

Schmidt

2006

Phys. Rev. D

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The main challenge faced by Higgsless models of electroweak symmetry breaking is to reconcile the experimental constraints imposed by the precision electroweak data and the top quark phenomenology with the unitarity constraints imposed by longitudinal gauge boson scattering amplitudes. In this paper we expand on previous work, giving details of how delocalized fermions can be used to adjust the S parameter to zero, while keeping the T and U parameters naturally suppressed. We also show that it is possible to obtain the top quark mass, without affecting the delay of unitarity violation of the W + W − → W + W − scattering amplitude, by separating the mass scales of the fermion sector (1/R f ) from that of the gauge sector (1/R g ). The fermion sector scale 1/R f is only weakly constrained by unitarity of the tt → W + W − scattering amplitude; thus the ratio R g /R f can be quite large, and the top mass can be easily achieved. Anomalous right-handed couplings involving the third generation quarks also avoid constraints from experimental data if 1/R f is sufficiently large.

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“…WHIZARD has also been used to study top quark physics in higgsless models of electroweak symmetry breaking [45].…”

Section: Exoticamentioning

confidence: 99%

WHIZARD—simulating multi-particle processes at LHC and ILC

2011

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Abstract. We describe the universal Monte-Carlo (parton-level) event generator WHIZARD d , version 2. The program automatically computes complete tree-level matrix elements, integrates them over phase space, evaluates distributions of observables, and generates unweighted partonic event samples. These are showered and hadronized by calling external codes, either automatically from within the program or via standard interfaces. There is no conceptual limit on the process complexity; using current hardware, the program has successfully been applied to hard scattering processes with up to eight particles in the final state. Matrix elements are computed as helicity amplitudes, so spin and color correlations are retained. For event generation, processes can be concatenated with full spin correlation, so factorized approximations to cascade decays are possible when complete matrix elements are not desired. The Standard Model, the MSSM, and many alternative models such as Little Higgs, anomalous couplings, or effects of extra dimensions or noncommutative SM extensions have been implemented. Using standard interfaces to parton shower and hadronization programs, WHIZARD covers physics at hadron, lepton, and photon colliders.

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Unitarity constraints on top quark signatures of Higgsless models

Cited by 16 publications

References 61 publications

Top quark signatures of Higgsless models

Top quark signatures of Higgsless models

An effective Higgsless theory: Satisfying electroweak constraints and a heavy top quark

WHIZARD—simulating multi-particle processes at LHC and ILC

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