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Sifting composite from elementary models at FCCee and CePC
by G. Cacciapaglia, A. Deandrea, A. M. Iyer, A. Pinto
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New Physics models with either an elementary or composite origin are often associated with a similar imprint in a direct search at colliders, case in point being the production of a light pseudoscalar in association with a monochromatic photon from the decay of a Z boson at future $e+e-$ colliders. We exploit the correlation between the discovery of a signal in the Z decays and electroweak precision measurements as a tool to distinguish a composite model from an elementary scalar one. Our results offer an appealing and rich physics case for future colliders and demonstrate how a lepton collider at the Z mass can be a discovery machine for new physics in the Higgs sector.
Published as SciPost Phys. 14, 170 (2023)
Author comments upon resubmission
We have fixed the typographical errors pointed out by the referee. In our reply report, we also clarified the importance of the work towards the development of FCCee strategy in terms of desired precision goals.
List of changes
1) Typographical Error in Eq. 4 has been corrected.
2) A c.c has now been included in the potential in Eq. 5.
3) The values of the contours in the plot in Figure 1 corresponds to a value of Yukawa coupling of the VLL to be $\sim 1.5$. This information has now been added to the draft
4) The following line is added in the last paragraph on Page 6.
``Overall, the results in Fig.2 serve as a useful benchmark for the development of FCCee strategy in terms of desired precision goals.''
Submission & Refereeing History
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