Electroweak constraints on warped models with custodial symmetry

Carena, Marcela; Pontón, Eduardo; Santiago, José; Wagner, Carlos E. M.

doi:10.1103/physrevd.76.035006

Cited by 214 publications

(347 citation statements)

References 61 publications

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“…Hence, whenever these corrections become important, non-universal fermion-gauge-boson couplings are induced, even when all fermions are localized identically. Thus, although localizing the leptons and first two quark generations near the conformal point can be interesting due to the possibility of a small coupling to the lightest gauge boson KK modes, a determination of the bounds requires a global fit to the EW observables and will be presented elsewhere [12]. In this paper we will concentrate on a region of parameter space where an analysis based on the effective parameters S, T and U is sufficient.…”

Section: Tree-level Corrections From Gauge Kk Modesmentioning

confidence: 99%

“…In fact, if the top mass is generated only fromM Q , T is negative for all c 1 and c 2 , the localization parameters for the two SO(5) multiplets that generate the top quark [12].…”

Section: Gauge-higgs Unificationmentioning

confidence: 99%

“…A naive estimation, using only R b , would seem to push the lower boundk ≈ 1.5 TeV. A more careful analysis requires a global fit to all EW observables that is currently underway [12].…”

Section: Gauge-higgs Unificationmentioning

confidence: 99%

“…Thus, as a first approximation we will consider the phenomenology of just the singlet. A more detailed analysis of the collider phenomenology of these and other fermion KK modes will be presented elsewhere [12]. Vector-like singlets of charge 2/3 can be pair or singly produced at colliders.…”

Section: Phenomenologymentioning

confidence: 99%

“…This mass makes the χ d 's in ξ 1 lighter and enhances their negative contribution to T . Therefore, it should be taken sufficiently small for a region with positive (or zero) T to exist [12]. to δg b L /g b L , involving the sector of fermion KK modes that mix with the top.…”

Section: Gauge-higgs Unificationmentioning

confidence: 99%

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Light Kaluza–Klein states in Randall–Sundrum models with custodial SU(2)

et al. 2006

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We consider Randall-Sundrum scenarios based on SU (2) L × SU (2) R and a discrete parity exchanging L with R. The custodial and parity symmetries can be used to make the tree level contribution to the T parameter and the anomalous couplings of the bottom quark to the Z very small. We show that the resulting quantum numbers typically induce a negative T parameter at one loop that, together with the positive value of the S parameter, restrict considerably these models. There are nevertheless regions of parameter space that successfully reproduce the fit to electroweak precision observables with light Kaluza-Klein excitations accessible at colliders. We consider models of gauge-Higgs unification that implement the custodial and parity symmetries and find that the electroweak data singles out a very well defined region in parameter space. In this region one typically finds light gauge boson Kaluza-Klein excitations as well as light SU (2) L singlet, and sometimes also doublet, fermionic states, that mix with the top quark, and that may yield interesting signatures at future colliders.

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Section: Tree-level Corrections From Gauge Kk Modesmentioning

confidence: 99%

“…In fact, if the top mass is generated only fromM Q , T is negative for all c 1 and c 2 , the localization parameters for the two SO(5) multiplets that generate the top quark [12].…”

Section: Gauge-higgs Unificationmentioning

confidence: 99%

“…A naive estimation, using only R b , would seem to push the lower boundk ≈ 1.5 TeV. A more careful analysis requires a global fit to all EW observables that is currently underway [12].…”

Section: Gauge-higgs Unificationmentioning

confidence: 99%

Section: Phenomenologymentioning

confidence: 99%

Section: Gauge-higgs Unificationmentioning

confidence: 99%

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Light Kaluza–Klein states in Randall–Sundrum models with custodial SU(2)

et al. 2006

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The electroweak symmetry breaking riddle

Altarelli

2010

Fortschritte der Physik

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I present a concise review of the Higgs problem which plays a central role in particle physics today. The Higgs of the minimal Standard Model is so far just a conjecture that needs to be verified or discarded at the LHC. Probably the reality is more complicated. I will summarize the motivation for New Physics that should accompany or even replace the Higgs discovery and a number of its possible forms that could be revealed by the LHC.Copyright line will be provided by the publisher The programme of LHC physicsFinally in November '09 the first collisions were observed at the LHC and the physics run at 3.5 TeV per beam will soon start. The particle physics community eagerly waits for the answers that one expects from the LHC to a number of big questions. The main physics issues at the LHC, addressed by the ATLAS and CMS collaborations, will be: 1) the experimental clarification of the Higgs sector of the electroweak (EW) theory, 2) the search for new physics at the weak scale that, on conceptual grounds, one predicts should be in the LHC discovery range, and, hopefully, 3) the identification of the particle(s) that make the Dark Matter in the Universe, in particular if those are WIMPs (Weakly Interacting Massive Particles). In addition the LHCb detector will be devoted to the study of precision B physics, with the aim of going deeper into the physics of the Cabibbo-Kobayashi-Maskawa (CKM) matrix and of CP violation. The LHC will also devote a number of runs to accelerate heavy ions and the ALICE collaboration will study their collisions for an experimental exploration of the QCD phase diagram.

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Collider aspects of flavor physics at high Q

Lari¹,

Pape²,

Porod³

et al. 2009

Flavor in the Era of the LHC

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This chapter of the "Flavor in the era of LHC" workshop report discusses flavor-related issues in the production and decays of heavy states at the LHC at high momentum transfer Q, both from the experimental and the theoretical perspective. We review top quark physics, and discuss the flavor aspects of several extensions of the standard model, such as supersymmetry, little Higgs models or models with extra dimensions. This includes discovery aspects, as well as the measurement of several properties of these heavy states. We also present publicly available computational tools related to this topic.

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Electroweak constraints on warped models with custodial symmetry

Cited by 214 publications

References 61 publications

Light Kaluza–Klein states in Randall–Sundrum models with custodial SU(2)

Light Kaluza–Klein states in Randall–Sundrum models with custodial SU(2)

The electroweak symmetry breaking riddle

Collider aspects of flavor physics at high Q

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