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

Banerjee, Avik; Franzosi, Diogo Buarque; Cacciapaglia, Giacomo; Deandrea, Aldo; Ferretti, G.; Flacke, Thomas; Fuks, Benjamin; Kunkel, Manuel; Panizzi, Luca; Porod, W.; Schwarze, Leonard

doi:10.48550/arxiv.2203.07270

“…This fermion sector exhibits an SU(5) × SU(6) global symmetry. Its electroweak sector has been investigated in [18,28,29]. The chiral condensates 𝜓𝜓 and 𝜒 𝜒 spontaneously break the global symmetry to the stability group 𝑆𝑂 (5) × 𝑆 𝑝 (6).…”

Section: Model Aspectsmentioning

confidence: 99%

“…identified as the composite Higgs doublet. This sector has been studied in [18,28], to which we refer for further details. The main aspect relevant for the discussion below is that, after the EW symmetry breaking, the bi-triplet…”

Section: Model Aspectsmentioning

confidence: 99%

“…The presence of the additional pNGBs generates new decay channels for the top partners [19] besides the ones usually considered in direct searches at the LHC. These can substantially shift the mass bounds for these states for which we refer to [18] for a summary. These models do not only have an extended pNGB sector but usually contain also additional baryonic states which do not transform as SU(3) 𝑐 triplets.…”

Section: Introductionmentioning

confidence: 99%

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LHC phenomenology of unusual top partners in composite Higgs models

Porod¹

2022

Preprint

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Composite Higgs models with a fermionic UV completion can contain additional colored states beside the usual top-partners. We focus here on a model which contains in addition SU(3) color octet top partners as well as color singlet ones. The latter can in principle serve as a dark matter candidate. We consider a particular composite Higgs model which contains SU(3) color octet top partners besides the usually considered triplet representations. Moreover, color singlet top partners are present as well which can in principle serve as dark matter candidates. We investigate the LHC phenomenology of these unusual top partners. Some of these states could at first glance be confused with gluinos predicted in supersymmetric models.

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“…This fermion sector exhibits an SU(5) × SU(6) global symmetry. Its electroweak sector has been investigated in [18,28,29]. The chiral condensates and spontaneously break the global symmetry to the stability group (5) × (6).…”

Section: Model Aspectsmentioning

confidence: 99%

“…The presence of the additional pNGBs generates new decay channels for the top partners [19] besides the ones usually considered in direct searches at the LHC. These can substantially shift the mass bounds for these states for which we refer to [18] for a summary. These models do not only have an extended pNGB sector but usually contain also additional baryonic states which do not transform as SU(3) triplets.…”

Section: Introductionmentioning

confidence: 99%

LHC phenomenology of unusual top partners in composite Higgs models

Porod¹

2022

Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021)

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Composite Higgs models with a fermionic UV completion can contain additional colored states beside the usual top-partners. We focus here on a model which contains in addition SU(3) color octet top partners as well as color singlet ones. The latter can in principle serve as a dark matter candidate. We consider a particular composite Higgs model which contains SU(3) color octet top partners besides the usually considered triplet representations. Moreover, color singlet top partners are present as well which can in principle serve as dark matter candidates. We investigate the LHC phenomenology of these unusual top partners. Some of these states could at first glance be confused with gluinos predicted in supersymmetric models.

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Heavy vector-like quarks decaying to exotic scalars: a case study with triplets

Banerjee,

Ellajosyula,

Panizzi

2024

J. High Energ. Phys.

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We investigate the pair production of a vector-like quark triplet with hypercharge 5/3 decaying into top quark and a complex scalar triplet with hypercharge 1 at the LHC. This novel scenario, featuring particles with exotic charges — two quarks with charge 8/3 and 5/3 and a scalar with charge 2 — serves as a unique window to models based on the framework of partial compositeness, where these particles naturally emerge as bound states around the TeV scale. Leveraging on the LHC data we establish exclusion limits on the masses of the vector-like quark and the scalar triplet. Subsequently, we design an analysis strategy aimed at improving sensitivity in the region which is still allowed. Our analysis focuses on two specific regions in the parameter space: the first entails a large mass gap between the vector-like quarks and the scalars, so that the vector-like quarks can decay into the scalars; the second involves a small mass gap, such that this decay is forbidden. To simplify the parameter space, both vector-like quarks and scalars are assumed to be degenerate or almost degenerate within the triplets, such that chain decays between fermions and scalars are suppressed. As a result, we found that final states characterized by a same-sign lepton pair, multiple jets, and high net transverse momentum (i.e. effective mass) will play a pivotal role to unveil this model and, more in general, models characterised by multiple vector-like quarks around the same mass scale during the high luminosity LHC phase.

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

Cited by 7 publications

References 99 publications

LHC phenomenology of unusual top partners in composite Higgs models

LHC phenomenology of unusual top partners in composite Higgs models

LHC phenomenology of unusual top partners in composite Higgs models

Heavy vector-like quarks decaying to exotic scalars: a case study with triplets

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