Holographic technidilaton at 125 GeV

Matsuzaki, Shinya; Yamawaki, Koichi

doi:10.1103/physrevd.86.115004

Cited by 64 publications

(213 citation statements)

References 60 publications

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“…It was shown that the TD can account for the 125 GeV Higgs, with couplings that are consistent with the current LHC data of the 125 GeV Higgs (see below) [8][9][10][11]. Thus the origin of the Higgs mass is dynamically explained by the scale of the chiral condensate in WTC.…”

Section: Introductionsupporting

confidence: 48%

“…A precise ladder evaluation of m φ F φ based on this PCDC relation reads [12]: (m φ F φ ) 2 More recently, in another approach using holographic WTC [15] it was shown [11] that the strong gluon dynamics via the large technigluon condensate can realize a parametrically massless TD limit m φ /v EW → 0+ and hence naturally realize m φ ≃ v EW /2 ≃ 125 GeV, consistent with the LHC Higgs data. Similar arguments for realizing a parametrically light dilaton were given in somewhat different contexts [16].…”

Section: Introductionmentioning

confidence: 79%

“…The global chiral symmetry-breaking pattern of the one-family model is G/H = SU (8) L × SU (8) R /SU (8) V , which is described by the usual nonlinear chiral Lagrangian based on the manifold G/H in terms of the 63 NG bosons. It is further straightforwardly extended to a scale-invariant version so as to incorporate the TD, φ, as a composite Higgs [9]. The chiral perturbation theory (ChPT) of the scale-invariant version can also be formulated by assigning the chiral order counting m 2 φ = O(p 2 ) [21].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of WTC we extend the scale-invariant version of the low-energy effective theory [8][9][10] -i.e., the case of the one-family model based on…”

Section: Introductionmentioning

confidence: 99%

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Discovering walking technirho mesons at the LHC

2014

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We formulate a scale-invariant hidden local symmetry (HLS) as a low-energy effective theory of the walking technicolor (WTC) which includes the technidilaton, technipions, and technirho mesons as the low-lying spectra. As a benchmark for LHC phenomenology, we in particular focus on the one-family model of WTC having eight technifermion flavors, which can be at energy scales relevant to the reach of the LHC described by the scale-invariant HLS based on the manifold [SU (8)L × SU (8)R] global × SU (8) local /SU (8)V , where SU (8) local is the HLS and the global SU (8)L × SU (8)R symmetry is partially gauged by SU (3) × SU (2)L × U (1)Y of the standard model. Based on the scale-invariant HLS, we evaluate the coupling properties of the technirho mesons and place limits on the masses from the current LHC data. Then, implications for future LHC phenomenology are discussed by focusing on the technirho mesons produced through the Drell-Yan process. We find that the color-octet technirho decaying to the technidilaton along with the gluon is of interest as the discovery channel at the LHC, which would provide a characteristic signature to probe the one-family WTC.

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Section: Introductionsupporting

confidence: 48%

Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

“…In the case of WTC we extend the scale-invariant version of the low-energy effective theory [8][9][10] -i.e., the case of the one-family model based on…”

Section: Introductionmentioning

confidence: 99%

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Discovering walking technirho mesons at the LHC

2014

Self Cite

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“…• Pure singlet extension of the SM [55][56][57][58][59] • Hidden (dark) sector DM with hidden (dark) gauge symmetry [52][53][54][60][61][62][63][64][65][66][67] • Dilaton or radion [68][69][70][71][72][73][74][75][76][77][78][79][80] • Enhancing diphoton rate from vector-like(VL) fermions or new charged vector bosons [81][82][83][84][85][86][87][88][89] Determination of the Higgs couplings in the presence of a (light) singlet scalar boson has not been discussed properly in the recent literature (but, for some earlier attempts, see Refs. [16,27,40]).…”

Section: Introductionmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the electroweak symmetry breaking (EWSB) sector of the SM and its various extensions. If one imposes the local gauge symmetry of the Standard Model (SM) (SU (3) c ×SU (2) L ×U (1) Y ) to the SM and any possible new physics scenarios, the SM Higgs properties will be modified by intrinsically two different ways: by new physics either coupling directly to the SM Higgs boson h, or affecting indirectly the SM Higgs properties through the mixing of h with a SM singlet scalar s. (Here s is a singlet under the SM gauge group, but may be charged under a new gauge charge and can have nonrenormalizable couplings to non-SM particles.) The models of two Higgs doublet, extra sequential and mirror fermions belong to the first category, whereas the models with a hidden sector dark matter, extra vectorlike fermions and new charged vector bosons, which can enhance the diphoton rate of the SM Higgs-like resonance, belong to the second category. We perform a global fit to data in terms of the effective Lagrangian description of two interaction eigenstates of scalar bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is more suitable to study singlet-extended scenarios discussed above compared to other approaches based on the Lagrangian of mass eigenstates. With fairly model-independent assumptions, the effective Lagrangian contains at most four free parameters still encompassing the majority of models in the literature. Interestingly, the SM gives the best fit if all data from ATLAS and CMS are used, whereas various singlet extensions can fit better to individual ATLAS or CMS data. Without further assumptions, an upper bound on the total width (or, nonstandard branching ratio) is generically obtained. Furthermore, global fit based on our parameterization can be used to probe interactions of the singlet scalar if the singlet resides below 2m W .

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Oblique S and T constraints on electroweak strongly-coupled models with a light Higgs

Pich

Rosell

Sanz-Ciller

2014

J. High Energ. Phys.

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Using a general effective Lagrangian implementing the chiral symmetry breaking SU(2) L ⊗ SU(2) R → SU(2) L+R , we present a one-loop calculation of the oblique S and T parameters within electroweak strongly-coupled models with a light scalar. Imposing a proper ultraviolet behaviour, we determine S and T at next-to-leading order in terms of a few resonance parameters. The constraints from the global fit to electroweak precision data force the massive vector and axial-vector states to be heavy, with masses above the TeV scale, and suggest that the W + W − and ZZ couplings of the Higgs-like scalar should be close to the Standard Model value. Our findings are generic, since they only rely on soft requirements on the short-distance properties of the underlying strongly-coupled theory, which are widely satisfied in more specific scenarios.

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Holographic technidilaton at 125 GeV

Cited by 64 publications

References 60 publications

Discovering walking technirho mesons at the LHC

Discovering walking technirho mesons at the LHC

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Oblique S and T constraints on electroweak strongly-coupled models with a light Higgs

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