Derivation of gauge invariance from high-energy unitarity bounds on the S matrix

Cornwall, John M.; Levin, David; Tiktopoulos, George

doi:10.1016/b978-0-444-88807-5.50102-3

Cited by 141 publications

(231 citation statements)

References 18 publications

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“…Not all the production and decay processes that could be computed with this method are equally sizable, however. In section 3.2 we will present an estimate of the various processes based on the use of the Goldstone boson Equivalence Theorem [29][30][31], this will allow us to classify (in section 3.3) the channels which are more promising for the search of the top partners at the LHC.…”

Section: Jhep04(2013)004 3 Top Partners Phenomenologymentioning

confidence: 99%

A first top partner hunter’s guide

Simone

Matsedonskyi

Rattazzi

et al. 2013

J. High Energ. Phys.

255

355

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We provide a systematic effective lagrangian description of the phenomenology of the lightest top-partners in composite Higgs models. Our construction is based on symmetry, on selection rules and on plausible dynamical assumptions. The structure of the resulting simplified models depends on the quantum numbers of the lightest top partner and of the operators involved in the generation of the top Yukawa. In all cases the phenomenology is conveniently described by a small number of parameters, and the results of experimental searches are readily interpreted as a test of naturalness. We recast presently available experimental bounds on heavy fermions into bounds on top partners: LHC has already stepped well inside the natural region of parameter space.

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Section: Jhep04(2013)004 3 Top Partners Phenomenologymentioning

confidence: 99%

A first top partner hunter’s guide

Simone

Matsedonskyi

Rattazzi

et al. 2013

J. High Energ. Phys.

255

355

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“…The first calculations of V L V L scattering were performed in the context of the so-called Effective W Approximation 1 (EWA) in the 1980s [57][58][59], with the use of the Goldstone equivalence theorem [60] 2 . The first realistic study of V L V L scattering in a strongly coupled EWSB sector but assuming the equivalence theorem and EWA and adopting several unitarisation prescriptions were performed in the 1990s [61,62] (see also [63]).…”

Section: Motivationmentioning

confidence: 99%

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Thomas¹

2016

Springer Theses

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In this thesis I study the collider phenomenology of BSM physics at the LHC, concentrating on the Higgs boson and supersymmetery. The implications and effects on cross sections of the loss of unitarity in scattering processes involving multiple vector bosons and/or the Higgs, when the Higgs couplings to the W and the Z are non-SM, is studied using an effective Lagrangian. Subsequently methods to remove unwanted background from transversely polarised vector bosons are explored, which enable an estimation of the potential to measure the Higgs couplings to weak bosons in a model-independent way via vector boson fusion. MSSM effects on Higgs production and decay are also considered, concentrating on the effects due to light stops, sbottoms and staus. Amongst other things, we find that light 3 rd generation squarks generally produce asymmetrical alteration in signal strengths of different production channels, generally causing µ V BF µ ggF > 1. Finally we extend some ATLAS analyses in the low ∆m = mt − mχ0 1 region, extending the excluded masses of light stops. This enables us to limit the maximum effects of light stops on the Higgs, and further limits the parameter space where the light stop scenario of electroweak baryogenesis is viable.

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“…We work in the heavy-top limit [37], in which the masses of the W and Z bosons are neglected with respect to M t . This is achieved by considering a gauge-less theory with massive quarks, the Higgs boson h, and 3 Goldstone bosons χ (related by the equivalence theorem [38][39][40] to the longitudinal components of the W and Z), where the only quark interaction is…”

Section: 2)mentioning

confidence: 99%

Indirect determinations of the top quark mass

Giudice

Paradisi

Струмиа

2015

J. High Energ. Phys.

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Abstract:We give a complete analysis of indirect determinations of the top quark mass in the Standard Model by introducing a systematic procedure to identify observables that receive quantum corrections enhanced by powers of M t . We discuss how to use flavour physics as a tool to extract the top quark mass. Although present data give only a poor determination, we show how future theoretical and experimental progress in flavour physics can lead to an accuracy in M t well below 2 GeV. We revisit determinations of M t from electroweak data, showing how an improved measurement of the W mass leads to an accuracy at the level of 1 GeV.

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Derivation of gauge invariance from high-energy unitarity bounds on the S matrix

Cited by 141 publications

References 18 publications

A first top partner hunter’s guide

A first top partner hunter’s guide

Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry

Indirect determinations of the top quark mass

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