On dilatons and the LHC diphoton excess

Megías, Eugenio; Pujolàs, Oriol; Quirós, M.

doi:10.1007/jhep05(2016)137

Cited by 51 publications

(42 citation statements)

References 73 publications

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“…In particular we will consider a set of warped theories with a strong deformation of conformality towards the infra-red (IR) brane [2][3][4][5][6][7][8][9][10][11][12], such that the Standard Model can propagate in the bulk of the fifth dimension, consistently with all measured electroweak observables. The theory is characterized by the superpotential W (φ) = 6k(1 + e a 0 φ )…”

Section: Jhep07(2017)102mentioning

confidence: 99%

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Lepton-flavor universality violation in R K and R D ∗ $$ {R}_{D^{{}_{\left(\ast \right)}}} $$ from warped space

Megías

Quirós

Salas

2017

J. High Energ. Phys.

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Some anomalies in the processes b → s ( = µ, e) and b → c ν ( = τ, µ, e), in particular in the observables R K and R D ( * ) , have been found by the BaBar, LHCb and Belle collaborations, leading to a possible lepton flavor universality violation. If these anomalies were confirmed they would inevitably lead to physics beyond the Standard Model. In this paper we try to accommodate the present anomalies in an extra dimensional theory, solving the naturalness problem of the Standard Model by means of a warped metric with a strong conformality violation near the infra-red brane. The R K anomaly can be accommodated provided that the left-handed bottom quark and muon lepton have some degree of compositeness in the dual theory. The theory is consistent with all electroweak and flavor observables, and with all direct searches of Kaluza-Klein electroweak gauge bosons and gluons. The fermion spectrum, and fermion mixing angles, can be reproduced by mostly elementary right-handed bottom quarks, and tau and muon leptons. Moreover the R D ( * ) anomaly requires a strong degree of compositeness for the left-handed tau leptons, which turns out to be in tension with experimental data on the g Z τ L coupling, possibly unless some degree of fine-tuning is introduced in the fixing of the CKM matrix.

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Section: Jhep07(2017)102mentioning

confidence: 99%

“…We will not specify here the details of the five-dimensional (5D) model, as they were widely covered in the literature, refs. [2][3][4][5][6][7][8][9][10][11][12], which we refer the reader to. 1 In this paper we will consider the superpotential of eq.…”

Section: Jhep07(2017)102mentioning

confidence: 99%

Lepton-flavor universality violation in R K and R D ∗ $$ {R}_{D^{{}_{\left(\ast \right)}}} $$ from warped space

Megías

Quirós

Salas

2017

J. High Energ. Phys.

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“…Besides, there are very recent phenomenological perspectives showing promising results for the dilaton field in the LHC [40][41][42]. The new thick brane setup is described by the action [4, 9, 10, 43, 44]…”

Section: Sine-gordon Brane With the Dilaton Fieldmentioning

confidence: 99%

Multiresonance modes in sine–Gordon brane models

et al. 2016

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In this work, we study the localization of the vector gauge field in two fivedimensional braneworlds generated by scalar fields coupled to gravity. The sine-Gordon like potentials are employed to produce different thick brane setups. A zero mode localized is obtained, and we show the existence of reverberations with the wave solutions indicating a quasi-localized massive mode. More interesting results are achieved when we propose a double sineGordon potential to the scalar field. The resulting thick brane shows a more detailed topology with the presence of an internal structure composed by two kinks. The massive spectrum of the gauge field is revalued on this scenario revealing the existence of various resonant modes. Furthermore, we compute the corrections to Coulomb law coming from these massive KK vector modes in these thick scenarios, where is concluded that the dilaton parameter regulates these corrections.

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“…This possibility would be favoured by a large width of the resonance, as first indications seem to suggest. Another possibility is to interpret the signal in the context of extra-dimensional models [5,9,29,30,48,84,125,141,203,225,312], with the resonance being a scalar, a graviton, a dilaton, or a radion, depending on the scenario. However, some of these interpretations are in tension with the non-observation of this resonance in other channels.…”

Section: Modelsmentioning

confidence: 99%

Precision tools and models to narrow in on the 750 GeV diphoton resonance

et al. 2016

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The hints for a new resonance at 750 GeV from ATLAS and CMS have triggered a significant amount of attention. Since the simplest extensions of the standard model cannot accommodate the observation, many alternatives have been considered to explain the excess. Here we focus on several proposed renormalisable weakly-coupled models and revisit results given in the literature. We point out that physically important subtleties are often missed or neglected. To facilitate the study of the excess we have created a collection of 40 model files, selected from recent literature, for the Mathematica package SARAH. With SARAH one can generate files to perform numerical studies using the tailormade spectrum generators FlexibleSUSY and SPheno. These have been extended to automatically include crucial higher order corrections to the diphoton and digluon decay rates for both CP-even and CP-odd scalars. Additionally, we have extended the UFO and CalcHep interfaces of SARAH, a

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On dilatons and the LHC diphoton excess

Cited by 51 publications

References 73 publications

Lepton-flavor universality violation in R K and R D ∗ $$ {R}_{D^{{}_{\left(\ast \right)}}} $$ from warped space

Lepton-flavor universality violation in R K and R D ∗ $$ {R}_{D^{{}_{\left(\ast \right)}}} $$ from warped space

Multiresonance modes in sine–Gordon brane models

Precision tools and models to narrow in on the 750 GeV diphoton resonance

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