CERN LHC signals from warped extra dimensions

Agashe, Kaustubh; Belyaev, A.; Krupovnickas, Tadas; Pérez, Gilad; Virzi, J.

doi:10.1103/physrevd.77.015003

Cited by 333 publications

(463 citation statements)

References 66 publications

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“…Parametrically, we then predict S ∼ y, S/ √ B ∼ y/ 3/2 , and S/B ∼ y 2 for pp → g (1) → tt. This behavior can significantly extend the reach for Little KK gluons, well above KK masses (∼ 4 TeV [10,11]) accessible at the LHC with O(10 2 ) fb −1 in untruncated models. In addition, one may expect that the enhanced Little g (1) production could provide very early hints of new physics at the LHC.…”

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confidence: 80%

“…[10] that imply a 3-TeV KK gluon can be detected at the 5σ level with about 25 fb −1 of integrated luminosity 1 . On the other hand, our Fig.…”

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confidence: 97%

“…Generally speaking, it has been shown that a very likely new state in these models to be discovered at the LHC is the first KK gluon [10,11]. The analysis of Refs.…”

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confidence: 99%

“…The analysis of Refs. [10,11] suggests that KK gluons as heavy as 4 TeV will be within the reach of the LHC. However, for the KK modes of the weak sector, the corresponding reach is in the 2-3 TeV range [12,13] and typically requires several hundred fb −1 .…”

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confidence: 99%

“…In particular, the lightest gluon KK mode g (1) in warped models generally has the largest production rate [10,11]. Here, the same enhanced coupling to light fermions as for the Z ′ would also lead to an enhanced production rate for g (1) .…”

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confidence: 99%

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Big signals of Little Randall–Sundrum models

2010

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We examine signals at the Large Hadron Collider (LHC) of Kaluza-Klein modes, in volumetruncated "Little Randall-Sundrum" (LRS) models of flavor, characterized by 5D cutoff scales M5 that are small compared to the 4D Planck mass MP ∼ 10 19 GeV. In particular, for the phenomenologically viable choice M5 ∼ 10 4 TeV, the discovery of a 2 (3)-TeV "Little" Z ′ at the LHC requires about 1 (4) fb −1 at √ s = 10 (14) TeV, in the clean di-lepton channel. Our results highlight the possibility of probing interesting values of M5, starting with the early LHC data. With M5 ∼ 10 4 TeV, discovering the second KK mode Z ′′ , at about 4.3 TeV, requires O(100) fb −1 at √ s = 14 TeV, providing a probe of the warped nature of the bulk that is encoded in the mass ratio of the first two KK modes, at design luminosity. By comparison, discovering a 3-TeV Z ′ of the Planck-weak hierarchy models (with M5 ∼ MP ), in any channel, would require upwards of O(300) fb −1 at √ s = 14 TeV. We also point out that discovery prospects markedly improve for Little KK gluons as well, but the challenging reconstruction of their tt decay products may not allow an appreciable advantage for early discovery, over the Little Z ′ case.Introduction: The Higgs condensate, H ≃ 250 GeV, sets the electroweak scale in the Standard Model (SM). Yet, the SM Higgs potential is unstable against quantum corrections from the cutoff scale, often assumed to be near the Planck scale M P ∼ 10 19 GeV. This gives rise to the hierarchy problem, which is the puzzling smallness of the ratio H /M P ∼ 10 −17 . The Randall-Sundrum (RS) model [1] was initially proposed to explain the hierarchy by gravitationally red-shifting the 5D fundamental scale M 5 ∼ M P down to the TeV-scale, along a warped 5 th dimension. This geometry is based on a slice of AdS 5 , truncated by flat 4D boundaries often referred to as the UV (Planck) and IR (TeV) branes. The RS metric is given by [1]

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confidence: 80%

“…[10] that imply a 3-TeV KK gluon can be detected at the 5σ level with about 25 fb −1 of integrated luminosity 1 . On the other hand, our Fig.…”

mentioning

confidence: 97%

“…Generally speaking, it has been shown that a very likely new state in these models to be discovered at the LHC is the first KK gluon [10,11]. The analysis of Refs.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Big signals of Little Randall–Sundrum models

2010

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Studies and Applications of Jet Vetoing in Boosted Topologies

Joshi

2015

QCD Radiation in Top-Antitop and Z+Jets Final States

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Composite Higgses

Bellazzini¹,

Csáki²,

Serra³

2014

Supersymmetry After the Higgs Discovery

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We present an overview of composite Higgs models in light of the discovery of the Higgs boson. The small value of the physical Higgs mass suggests that the Higgs quartic is likely loop generated, thus models with tree-level quartics will generically be more tuned. We classify the various models (including bona fide composite Higgs, little Higgs, holographic composite Higgs, twin Higgs and dilatonic Higgs) based on their predictions for the Higgs potential, review the basic ingredients of each of them, and quantify the amount of tuning needed, which is not negligible in any model. We explain the main ideas for generating flavor structure and the main mechanisms for protecting against large flavor violating effects, and present a summary of the various coset models that can result in realistic pseudo-Goldstone Higgses. We review the current experimental status of such models by discussing the electroweak precision, flavor and direct search bounds, and comment on UV completions and on ways to incorporate dark matter.We start by explaining the consequences of the recent measurement of the value of the Higgs mass on the parameters of the Higgs potential: both the mass and quartic self coupling are independently fixed. A light Higgs mass of 125 GeV implies a small quartic, which is more likely to point toward a loop induced quartic rather than a tree-level one. We present a simple parametrization of the potential suitable for pseudo-Goldstone composite Higgs models, and the tuning necessary to obtain this potential. In Sec. 3 we classify the various types of composite Higgs models based on their predictions for the Higgs potential and quantify the expected amount of tuning in these models. Sec. 4 contains the discussion of the various possible mechanisms for generating the Yukawa couplings, and for protecting from large flavor changing effects. We review the various coset models that can give rise to realistic patterns of symmetry breaking with SM-like Higgs bosons in Sec. 5. The signals and constraints on the composite Higgs models are summarized in Sec. 6, and we finally comment on UV completions in Sec. 7. The Higgs Potential of Composite Higgs Models and TuningOne can nicely classify the various types of composite Higgs models by the size of the Higgs potential and also by the mechanism that generates the Yukawa couplings, in particular for the top quark. We will first focus on the generic features of the potential, in order to categorize in Sec. 3 composite Higgs models based on the particulars of such a potential, and finally in Sec. 4 we will discuss the various mechanisms for the generation of the Yukawa couplings.While the numerical values of the parameters in the Higgs potential (1.1) are now fixed, there are several different dynamical ways in which one can arrive at this potential. We will make the following assumptions regarding the dynamics responsible for generating the potential:• The Higgs is a composite with a scale of compositeness given by f .

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CERN LHC signals from warped extra dimensions

Cited by 333 publications

References 66 publications

Big signals of Little Randall–Sundrum models

Big signals of Little Randall–Sundrum models

Studies and Applications of Jet Vetoing in Boosted Topologies

Composite Higgses

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