Speaker
Description
A photon-photon collider presents outstanding physics opportunities that complement and extend the capabilities of a linear e+e- collider. This is due to three key defining features: i) the Higgs boson is produced in the s-channel, in contrast to e+e- where an additional Z boson has to be produced, ii) photons allow for full control of the polarization of the initial state, enabling a rich physics program of CP violation, and iii) at 280 GeV CoM energy (as opposed to 550 GeV in e+e-), a photon-photon collider mode can produce pairs of Higgs bosons and directly measure the Higgs potential with sensitivity complementary to the e+e- mode and to future 10 TeV pCoM hadron colliders.
In this talk, we present the first feasibility study for measuring the Higgs self-coupling with an X-ray FEL photon-photon collider. All physics backgrounds as well as the residual e-gamma and e+e- backgrounds characteristic of gamma-gamma colliders were simulated using CAIN and WHIZARD Monte Carlo, and ran through a Delphes ILC-like detector simulation. We discuss the Higgs self coupling expected precision and its complementary with a 550 GeV e+e- linear collider (LCF) and a 100 TeV hadron collider (FCC-hh)
