Holographic models of composite Higgs in the Veneziano limit. Part I. Bosonic sector

Elander, Daniel; Frigerio, Michele; Knecht, Marc; Kneur, Jean-Loïc

doi:10.1007/jhep03(2021)182

Cited by 23 publications

(38 citation statements)

References 159 publications

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“…We do not review these constructions here but refer to the existing literature: see [14,15] for the initial constructions (a streamlined classification can be found in [23]). Additional models of this type are presented in [17,[24][25][26][27][28][29][30][31][32].…”

Section: Composite Higgs and Partial Compositeness: An Outlinementioning

confidence: 99%

Phenomenological aspects of composite Higgs scenarios: exotic scalars and vector-like quarks

Banerjee¹,

Franzosi²,

Cacciapaglia³

et al. 2022

Preprint

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Composite Higgs models usually contain additional pseudo Nambu Goldstone bosons and vector-like quarks. We discuss various aspects related to their LHC phenomenology and provide summary plots of exclusion limits using currently available information. We also describe a general parametrisation implemented in a software for Monte Carlo simulations and study the SU (5)/SO(5) scenario as a concrete example.

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Section: Composite Higgs and Partial Compositeness: An Outlinementioning

confidence: 99%

Phenomenological aspects of composite Higgs scenarios: exotic scalars and vector-like quarks

Banerjee¹,

Franzosi²,

Cacciapaglia³

et al. 2022

Preprint

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“…Recent more realistic constructions with a warped EDS (beyond the RS throat and motivated by top-down approaches) can be found in Refs. [162,163].…”

Section: Discussion: Gauge Hierarchy Ultraviolet Nonlocality and Bran...mentioning

confidence: 99%

Extra Dimensions & Fuzzy Branes in String-Inspired Nonlocal Field Theory

Nortier¹

2021

Preprint

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Particle physics models with extra dimensions of space (EDS's) and branes allow to shed new light on naturalness of the electroweak and flavor sectors, with a rich TeV scale phenomenology. Usually, such models are formulated in the framework of local effective field theories. The scope of this article is to propose new model building issues with EDS and branes, arising in the framework of string-inspired infinite derivative quantum field theories (QFT's), which are perturbatively exorcized (ghost-free) and intrinsically nonlocal above some ultraviolet (UV) scale. First, a toy model with bulk and brane scalar fields is presented. It is shown that a 4D field localized on a δ-like 3-brane is still delocalized in the bulk on a small distance from the brane position, with a penetration length given by the nonlocal length scale. Fields localized on such distant fuzzy branes are thus allowed to interact directly with suppressed couplings, which is impossible in a local QFT. It is also argued that above the nonlocal scale, it should be much more difficult to probe the Kaluza-Klein (KK) tower in an experiment, because of the UV opaqueness of such infinite derivative QFT's. In this way, a shadow EDS is obtained if the nonlocal and KK scales are close to each other, such that the effects of the KK-excitations are screened compared to a local QFT. After that, directions for model building are given. By using this new possibility of fuzzy branes, a new realization of split fermions in an EDS is presented, allowing to naturally generate flavor hierarchies. Moreover, with a warped EDS, the usual warp transmutation of a brane mass term is revisited, where it is shown that the nonlocal scale is also redshifted. This may provide a new way to solve or reduce the little hierarchy problem related to the Higgs boson mass.

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“…In these studies, EFT (and perturbative) arguments and guidance from the experiment are combined to constraint the strongly coupled dynamics, but its detailed description is accessible only with non-perturbative instruments. There is a rich literature on the topic coming from gauge-gravity dualities, in the context of bottom-up holographic models [51][52][53], with a recent resurgence of interest [54][55][56][57], including a first attempt at identifying a complete top-down model [58]. Alternative ways to approach the dynamics have also been proposed in Ref.…”

Section: The Lattice Theorymentioning

confidence: 99%

Lattice studies of the $Sp(4)$ gauge theory with two fundamental and three antisymmetric Dirac fermions

Bennett,

Hong,

Hsiao

et al. 2022

Preprint

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We consider the Sp(4) gauge theory coupled to N f = 2 fundamental and n f = 3 antisymmetric flavours of Dirac fermions in four dimensions. This theory serves as the microscopic origin for composite Higgs models with SU (4)/Sp(4) coset, supplemented by partial top compositeness. We study numerically its lattice realisation, and couple the fundamental plaquette action to Wilson-Dirac fermions in mixed representations, by adopting a (rational) hybrid Monte Carlo method, to perform non-trivial tests of the properties of the resulting lattice theory.We find evidence of a surface (with boundaries) of first-order bulk phase transitions in the threedimensional space of bare parameters (one coupling and two masses). Explicit evaluation of the Dirac eigenvalues confirms the expected patterns of global symmetry breaking. After investigating finite volume effects in the weak-coupling phase of the theory, for the largest available lattice we study the mass spectra of the lightest spin-0 and spin-1 flavoured mesons composed of fermions in each representation, and of the lightest half-integer spin composite particle made of fermions in different representations-the chimera baryon. This work sets the stage for future systematical studies of the non-perturbative dynamics in phenomenologically relevant regions of parameter space.

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Holographic models of composite Higgs in the Veneziano limit. Part I. Bosonic sector

Cited by 23 publications

References 159 publications

Phenomenological aspects of composite Higgs scenarios: exotic scalars and vector-like quarks

Phenomenological aspects of composite Higgs scenarios: exotic scalars and vector-like quarks

Extra Dimensions & Fuzzy Branes in String-Inspired Nonlocal Field Theory

Lattice studies of the $Sp(4)$ gauge theory with two fundamental and three antisymmetric Dirac fermions

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