Riding the Seesaw: what Higgsstrahlung may reveal about massive neutrinos

Tobias Felkl; Adam Lackner; Michael Schmidt

doi:10.1140/epjc/s10052-023-11461-7

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 342
https://doi.org/10.1140/epjc/s10052-023-11461-7

Regular Article - Theoretical Physics

Riding the Seesaw: what Higgsstrahlung may reveal about massive neutrinos

Tobias Felkl^a, Adam Lackner and Michael Schmidt

Sydney Consortium for Particle Physics and Cosmology, School of Physics, The University of New South Wales, 2052, Sydney, NSW, Australia

^a t.felkl@unsw.edu.au

Received: 11 January 2023
Accepted: 31 March 2023
Published online: 28 April 2023

Abstract

We investigate if the projected high-precision measurements of the cross section of the Higgsstrahlung process $e^{+} e^{-} \to Z h$ $e^+ e^- \rightarrow Zh$ at a future electron–positron collider can be utilised to indirectly probe the fermionic Seesaw models. We consider the two centre-of-mass energies $\sqrt{s} = 240$ $\sqrt{s}=240$ GeV and 365 GeV, and compare the collider reaches to constraints from electroweak observables, probes of lepton flavour universality and the existing and prospective bounds from searches for lepton flavour violation. For the analysis we assume the limit of an exactly conserved lepton-number symmetry. We find that while any appreciable correction to the Higgsstrahlung cross section is already strictly constrained in the Type-I Seesaw model, effects of up to $O (10 %)$ ${\mathcal {O}}(10\%)$ are possible within Type-III Seesaw.

© The Author(s) 2023

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