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Charting the European Course to the High-Energy Frontier

Authors :: Amaldi, U.
Aslanides, E.
Barate, R.
Benvenuti, C.
Bloch, P.
Camporesi, T.
David, A.
Denegri, D.
Diemoz, M.
Di Lella, L.
Dissertori, G.
Doble, N.
Dumarchez, J.
Ellis, J.
Engelen, J.
Fabjan, C.
Fuks, B.
Gavillet, P.
Hoecker, A.
Iliopoulos, J.
Innocenti, P.
Kozanecki, W.
Lebrun, P.
Smith, C. Llewellyn
Lourenço, C.
Maiani, L.
Malgeri, L.
Mangano, M.
Moortgat, F.
Mulders, M.
Myers, S.
Nessi-Tedaldi, F.
Pape, L.
Pauss, F.
Perin, R.
Rodrigo, T.
Rolandi, G.
Schopper, A.
Schukraft, J.
Spiro, M.
Sulak, L.
Taylor, T.
Treille, D.
Tonelli, G.
Unal, G.
Vannucci, F.
Varela, J.
Virdee, T.
Voss, R.
Wallny, R.
Wenninger, H.
Zalewski-Bak, A.
Zinn-Justin, J.
Publication Year :: 2019
Abstract: We review the capabilities of two projects that have been proposed as the next major European facility, for consideration in the upcoming update of the European Strategy for Particle Physics: CLIC and FCC. We focus on their physics potentials and emphasise the key differences between the linear or circular approaches. We stress the uniqueness of the FCC-ee programme for precision electroweak physics at the $Z$ peak and the $WW$ threshold, as well as its unequalled statistics for Higgs physics and high accuracy for observing possible new phenomena in Higgs and $Z$ decays, whereas CLIC and FCC-ee offer similar capabilities near the $t \overline t$ threshold. Whilst CLIC offers the possibility of energy upgrades to 1500 and 3000 GeV, FCC-ee paves the way for FCC-hh. The latter offers unique capabilities for making direct or indirect discoveries in a new energy range, and has the highest sensitivity to the self-couplings of the Higgs boson and any anomalous couplings. We consider the FCC programme to be the best option to maintain Europe's place at the high-energy frontier during the coming decades.<br />Comment: Contribution to the update of the European Strategy for Particle Physics