https://doi.org/10.1140/epjp/s13360-026-07942-9
Regular Article
Higgs pair production at the photon collider
1
Institut für Theoretische Physik, Universität Hamburg, Hamburg, Germany
2
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
a
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Received:
27
March
2026
Accepted:
7
June
2026
Published online:
3
July
2026
Abstract
A photon collider, either in conjunction with an 
linear collider or as a stand-alone facility, offers a very attractive Higgs physics programme at relatively low centre-of-mass (c.m.) energies. While the Higgs boson that has been discovered at the LHC can be studied in detail in resonant production at 125 GeV, a c.m. energy as low as 280 GeV can probe the Higgs potential via the Higgs pair production process providing access to the trilinear Higgs-boson self-coupling. High polarisation of the photon beams (produced via Compton back-scattering) can be achieved and adjusted by flipping the polarisation of the incident laser. The prospects for exploring the Higgs pair production process at a photon collider are assessed by comparing different running scenarios utilising different types of the incident laser. The possibility to use photon polarisations for disentangling different kinds of contributions to the Higgs pair production process is emphasised.
© The Author(s) 2026
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