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Low- and high-energy phenomenology of a doubly charged scalar

Low- and high-energy phenomenology of a doubly charged scalar
Low- and high-energy phenomenology of a doubly charged scalar

We explore the phenomenology of an SU(2)-singlet doubly charged scalar at the high and low energy frontier. Such a particle is predicted in different new physics models, like left-right symmetric models or the Zee-Babu model. Nonetheless, since its interactions with Standard Model (SM) leptons are gauge invariant, it can be consistently studied as a UV complete SM extension. Its signatures range from same-sign dilepton pairs to flavor changing decays of charged leptons to muonium-antimuonium oscillations. In this article, we use a systematic effective-field-theory approach for studying the low-energy observables and comparing them consistently to collider bounds. For this purpose, experimental searches for doubly charged scalars at the Large Hadron Collider are reinterpreted, including large width effects, and projections for exclusion and discovery reaches in the high-luminosity phase are provided. The sensitivities of the future International Linear Collider and Compact Linear Collider for the doubly charged scalar are presented with a focus on dilepton final states and resonant production. Theoretically and phenomenologically motivated benchmark scenarios are considered showing the different impact of low- and high-energy observables. We find that future low- and high-energy experiments display strong complementarity in studying the parameter space of the model.

2470-0010
1-20
Crivellin, Andreas
71c800a1-7868-4b88-b882-9644383823c9
Ghezzi, Margherita
91a2fed0-8f91-4281-93b0-fc999943591e
Panizzi, Luca
e8ade38e-ee5d-4e2d-8307-3286a8b92740
Pruna, Giovanni Marco
1cfcac6c-e730-4c1a-b460-62e7fef81a1b
Signer, Adrian
40ec128d-a9c4-4eeb-81e5-b566513d7367
Crivellin, Andreas
71c800a1-7868-4b88-b882-9644383823c9
Ghezzi, Margherita
91a2fed0-8f91-4281-93b0-fc999943591e
Panizzi, Luca
e8ade38e-ee5d-4e2d-8307-3286a8b92740
Pruna, Giovanni Marco
1cfcac6c-e730-4c1a-b460-62e7fef81a1b
Signer, Adrian
40ec128d-a9c4-4eeb-81e5-b566513d7367

Crivellin, Andreas, Ghezzi, Margherita, Panizzi, Luca, Pruna, Giovanni Marco and Signer, Adrian (2019) Low- and high-energy phenomenology of a doubly charged scalar. Physical Review D, 99 (3), 1-20. (doi:10.1103/PhysRevD.99.035004).

Record type: Article

Abstract

We explore the phenomenology of an SU(2)-singlet doubly charged scalar at the high and low energy frontier. Such a particle is predicted in different new physics models, like left-right symmetric models or the Zee-Babu model. Nonetheless, since its interactions with Standard Model (SM) leptons are gauge invariant, it can be consistently studied as a UV complete SM extension. Its signatures range from same-sign dilepton pairs to flavor changing decays of charged leptons to muonium-antimuonium oscillations. In this article, we use a systematic effective-field-theory approach for studying the low-energy observables and comparing them consistently to collider bounds. For this purpose, experimental searches for doubly charged scalars at the Large Hadron Collider are reinterpreted, including large width effects, and projections for exclusion and discovery reaches in the high-luminosity phase are provided. The sensitivities of the future International Linear Collider and Compact Linear Collider for the doubly charged scalar are presented with a focus on dilepton final states and resonant production. Theoretically and phenomenologically motivated benchmark scenarios are considered showing the different impact of low- and high-energy observables. We find that future low- and high-energy experiments display strong complementarity in studying the parameter space of the model.

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PhysRevD.99.035004 - Version of Record
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e-pub ahead of print date: 7 February 2019
Published date: February 2019

Identifiers

Local EPrints ID: 429150
URI: https://eprints.soton.ac.uk/id/eprint/429150
ISSN: 2470-0010
PURE UUID: 0cc236b3-5848-4aa2-91fe-318c1cc717f4

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Date deposited: 22 Mar 2019 17:30
Last modified: 14 Aug 2019 16:33

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