The Lepton Collider (FCC-ee) Conceptual Design Report

O.A.SAMPAYO; A.ABADA - FCC. COLLABORATION (1349 AUTORES)

EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS

EDP SCIENCES S A

Lugar: Paris; Año: 2019 vol. 228

1951-6355

Particle physics has arrived at an important moment in its history. The discovery of the Higgs boson, witha mass of 125 GeV, completes the matrix of particles and interactions that has constituted the ?StandardModel? for several decades. This model is a consistent and predictive theory, which has so far provensuccessful at describing all phenomena accessible to collider experiments. On the other hand, severalexperimental facts require the extension of the Standard Model and explanations are needed for observationssuch as the domination of matter over antimatter, the evidence for dark matter and the non-zeroneutrino masses. Theoretical issues that need to be addressed include the hierarchy problem, the neutralityof the Universe, the stability of the Higgs boson mass upon quantum corrections and the strongCP problem. This report contains the description of a novel research infrastructure based on a highestluminosityenergy frontier electron-positron collider (FCC-ee) designed to address the open questionsof modern physics. It will be a general precision instrument for the continued in-depth exploration ofnature at the smallest scales, optimised to measure precisely the properties of the Higgs boson at theper-cent level, the Z and W bosons, the top quark and the Higgs coupling to the Z at the per-mil level.FCC-ee will provide unprecedented sensitivity to signs of new physics appearing either in the form ofsmall deviations from the Standard Model or as rare decay processes.