Single production of the excited electrons in the future FCC-based lepton–hadron colliders

Kara, S. O.

doi:10.1142/s0217751x18501415

Cited by 11 publications

(8 citation statements)

References 37 publications

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“…Moreover, the composite Majorana neutrinos of this model can be responsible for baryogenesis via leptogenesis [33,34]. The phenomenology of other excited states has also been discussed in a series of recent papers [31,[35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Perturbative unitarity bounds for effective composite models

et al. 2019

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In this paper we present the partial wave unitarity bound in the parameter space of dimension-5 and dimension-6 effective operators that arise in a compositeness scenario. These are routinely used in experimental searches at the LHC to constraint contact and gauge interactions between ordinary Standard Model fermions and excited (composite) states of mass M. After deducing the unitarity bound for the production process of a composite neutrino, we implement such bound and compare it with the recent experimental exclusion curves for Run 2, the High-Luminosity and High-Energy configurations of the LHC. Our results also applies to the searches where a generic single excited state is produced via contact interactions. We find that the unitarity bound, so far overlooked, is quite compelling and significant portions of the parameter space (M, Λ) become excluded in addition to the standard request M ≤ Λ.

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Section: Introductionmentioning

confidence: 99%

Perturbative unitarity bounds for effective composite models

et al. 2019

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“…Here, L T = (ν L , L ) is the ordinary lepton doublet, g and g are the SU(2) L and U(1) Y gauge couplings and W W W µν , B µν are the field strength tensor of the corresponding gauge fields respectively; τ τ τ are the Pauli matrices and Y is the hypercharge, f and f are dimensionless couplings and are expected (and assumed) to be of order unity. Excited states interacting with the SM sector through the model Lagrangians (1.1)-(1.2) and (1.3) have been extensively searched for at high-energy collider facilities and their phenomenology has also been discussed in a series of recent papers [24,25,26,27,28,29,30,31,32,33]. The current strongest bounds are due to the recent LHC experiments.…”

Section: Pos(corfu2019)057mentioning

confidence: 99%

Perturbative unitarity bounds for fermions composite models

Biondini¹,

Leonardi²,

Panella³

et al. 2020

Proceedings of Corfu Summer Institute 2019 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2019)

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Perturbative unitarity is a powerful tool for inferring the range of validity of a given effective field theory. Here, we study such a bound in the parameter space of dimension-5 and dimension-6 effective operators that arise in a scenario of fermion compositeness. These operators are routinely used in experimental searches at the LHC to constraint contact and gauge interactions between ordinary Standard Model fermions and excited states of mass M. We derive the unitarity bound for the production process of an excited neutrino, then we implement such bound and compare it with the recent experimental exclusion curves for Run 2, the High-Luminosity and High-Energy configurations of the LHC. The results also applies to the searches where a generic single excited state is produced via dimension-6 contact interactions. The unitarity bound, so far overlooked in these effective models, is quite compelling and can serve as a guide for exploring the parameter space (M, Λ) in addition to the standard request M ≤ Λ.

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“…Even though there is no evidence for the excited leptons in the experimental studies performed in HERA, Tevatron, ATLAS and center of mass system (CMS) (see the references in [3]), the colliders with higher center-of-mass energy and luminosity, planned to be installed in the future, will continue to search for their discovery. A possible discovery of the any excited fermion will be a direct proof of the lepton and quark compositeness.…”

Section: Introductionmentioning

confidence: 99%

MANIFESTATION OF AN EXCITED ELECTRON IN e⁺e¯ → γγ REACTION

Gakh¹,

Konchatnij²,

Merenkov³

et al. 2021

Problems of Atomic Science and Technology

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The differential cross section and some polarization observables have been calculated for the e⁺e¯ → γγ reaction taking into account the contribution of the excited electron. The spin correlation coefficients were calculated for the case when both beams are polarized. We consider two approaches for the excited electron contribution: the eу → γγ contact interaction and the exchange of the excited electron in t- and u-channels. Numerical estimations are given for the excited electron contribution to the differential cross section and spin correlation coefficients for vari-ous values of the electron beam energy and excited electron mass.

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Single production of the excited electrons in the future FCC-based lepton–hadron colliders

Cited by 11 publications

References 37 publications

Perturbative unitarity bounds for effective composite models

Perturbative unitarity bounds for effective composite models

Perturbative unitarity bounds for fermions composite models

MANIFESTATION OF AN EXCITED ELECTRON IN e⁺e¯ → γγ REACTION

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