Deciphering the spin of new resonances in Higgsless models

Alves, Alexandre; Eboli, O. J. P.; Gonzalez-Garcia, M. C.; Mizukoshi, J. K.

doi:10.48550/arxiv.0810.1952

Cited by 8 publications

(12 citation statements)

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“…17 we show the estimated signal compared to the Standard Model background, as well as a pair of phenomenological schemes designed to describe the unitarization of massive vector boson scattering. This is only one example of electroweak scattering channels which will serve as discovery channels for Higgsless KK excitation [418][419][420][421][422][423]. Alternative signals appear in Higgless models with an extended top quark sector, including exotic vector-like custodial fermions [414,424,425].…”

Section: Higgless Modelsmentioning

confidence: 99%

Physics searches at the LHC

Morrissey,

Plehn,

Tait

2009

Preprint

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With the LHC up and running, the focus of experimental and theoretical high energy physics will soon turn to an interpretation of LHC data in terms of the physics of electroweak symmetry breaking and the TeV scale. We present here a broad review of models for new TeV-scale physics and their LHC signatures. In addition, we discuss possible new physics signatures and describe how they can be linked to specific models of physics beyond the Standard Model. Finally, we illustrate how the LHC era could culminate in a detailed understanding of the underlying principles of TeV-scale physics.

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Section: Higgless Modelsmentioning

confidence: 99%

Physics searches at the LHC

Morrissey,

Plehn,

Tait

2009

Preprint

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“…Spin, on the other hand, shows up only in the distributions in various kinematic variables in the production and the decay sub-processes. Since the knowledge of the spin, along with the gauge quantum numbers, can enable us to distinguish amongst various candidate theories of physics beyond the SM (BSM) there has been growing interest in this subject recently in the context of the upcoming Large Hadron Collider (LHC) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19] and also in the context of proposed International Linear Collider (ILC) [20,21,22,23,24,25].…”

Section: Introductionmentioning

confidence: 99%

“…distribution [4,7,11,13,22] in the production (polar) angle relying on a known production mechanism, 3. comparing different spin assignments to intermediate particles in a process for a given collider signature [1,5,7,8,9,10,17,18,19],…”

Section: Introductionmentioning

confidence: 99%

A model independent spin analysis of fundamental particles using azimuthal asymmetries

Boudjema¹,

Singh²

2009

J. High Energy Phys.

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Exploiting the azimuthal angle dependence of the density matrices we construct observables that directly measure the spin of a heavy unstable particle. A novelty of the approach is that the analysis of the azimuthal angle dependence in a frame other than the usual helicity frame offers an independent cross-check on the extraction of the spin. Moreover, in some instances when the transverse polarisation tensor of highest rank is vanishing, for an accidental or dynamical reason, the standard azimuthal asymmetries vanish and would lead to a measurement with a wrong spin assignment. In a frame such as the one we construct, the correct spin assignment would however still be possible. The method gives direct information about the spin of the particle under consideration and the same event sample can be used to identify the spins of each particle in a decay chain. A drawback of the method is that it is instrumental only when the momenta of the test particle can be reconstructed. However we hope that it might still be of use in situations with only partial reconstruction. We also derive the conditions on the production and decay mechanisms for the spins, and hence the polarisations, to be measured at a collider experiment. As an example for the use of the method we consider the simultaneous reconstruction, at the partonic level, of the spin of both the top and the W in top pair production in e + e − in the semi-leptonic channel.

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“…Initial studies of the LHC phenomenology of the three-site model, focusing on W ′ boson production in the vector-boson fusion and associated production modes, were reported in [46], production of nearly-fermiophobic vector bosons in the three-site model was described in [47], and a more extensive analysis including additional channels is underway [48]. Related studies of other Higgsless scenarios, both continuum and deconstructed, are also in the literature [49,50,51,52,53,54,55,56].…”

Section: Introductionmentioning

confidence: 99%

W_L W_L Scattering in Higgsless Models: Identifying Better Effective Theories

Belyaev,

Chivukula,

Christensen

et al. 2009

Preprint

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The three-site model has been offered as a benchmark for studying the collider phenomenology of Higgsless models. In this paper we analyze how well the three-site model performs as a general exemplar of Higgsless models in describing WLWL scattering, and which modifications can make it more representative. We employ general sum rules relating the masses and couplings of the Kaluza-Klein (KK) modes of the gauge fields in continuum and deconstructed Higgsless models as a way to compare the different theories. We show that the size of the four-point vertex for the (unphysical) Nambu-Goldstone modes and the degree to which the sum rules are saturated by contributions from the lowest-lying KK resonances both provide good measures of the extent to which a highlydeconstructed theory can accurately describe the low-energy physics of a continuum 5d Higgsless model. After comparing the three-site model to flat and warped continuum models, we analyze extensions of the three-site model to a longer open linear moose with an additional U (1) group and to a ring ("BESS' or "hidden local symmetry") model with three sites and three links. Both cases may be readily analyzed in the framework of the general sum rules. We demonstrate that WLWL scattering in the ring model can very closely approximate scattering in the continuum models, provided that the hidden local symmetry parameter 'a' is chosen to mimic ρ-meson dominance of ππ scattering in QCD. The hadron and lepton collider phenomenology of both extended models is briefly discussed, with a focus on the complementary information to be gained from precision measurements of the Z ′ line shape and ZW W coupling at a high-energy lepton collider. SU (2) × SU (2) Higgsless model with a flat extra dimension

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Deciphering the spin of new resonances in Higgsless models

Cited by 8 publications

References 0 publications

Physics searches at the LHC

Physics searches at the LHC

A model independent spin analysis of fundamental particles using azimuthal asymmetries

W_L W_L Scattering in Higgsless Models: Identifying Better Effective Theories

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