Measurements of γγ→ Higgs and γγ→ W⁺W⁻ in e⁺e⁻ collisions at the Future Circular Collider
d'Enterria, David · Teles, Patricia Rebello · Martins, Daniel E.
Original · EN
The measurements of the two-photon production of the Higgs boson and of W± boson pairs in e⁺e⁻ collisions at the Future Circular Collider (FCC-ee) are investigated. The processes e⁺e⁻γγe+ He-,e+ W+W-e- are computed using the effective photon approximation for electron-positron beams, and studied in their H→ bb and W+W-→ 4j decay final-states including parton showering and hadronization, jet reconstruction, e± forward tagging, and realistic experimental cuts. After selection criteria, up to 75 Higgs bosons and 6600 W± pairs will be reconstructed on top of controllable continuum backgrounds at √s = 240 and 350 GeV for the total expected integrated luminosities, by tagging the scattered e± with near-beam detectors. A 5σ observation of γγ is thereby warranted, as well as high-statistics studies of triple γWW and quartic γγWW electroweak couplings, improving by at least factors of 2 and 10 the current limits on dimension-6 anomalous quartic gauge couplings.
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