Abstract
Circular colliders have the advantage of delivering collisions to multiple interaction points, which allow different detector designs to be studied and optimised—up to four for FCC-ee. On the one hand, the detectors must satisfy the constraints imposed by the invasive interaction region layout. On the other hand, the performance of heavy-flavour tagging, of particle identification, of tracking and particle-flow reconstruction, and of lepton, jet, missing energy and angular resolution, need to match the physics programme and the exquisite statistical precision offered by FCC-ee. During the FCC feasibility study (2021–2025), benchmark physics processes will be used to determine, via appropriate simulations, the requirements on the detector performance or design that must be satisfied to ensure that the systematic uncertainties of the measurements are commensurate with their statistical precision. The usage of the data themselves, in order to reach the challenging goals on the stability and on the alignment of the detector, in particular for the programme at and around the Z peak, will also be studied. In addition, the potential for discovering very weakly coupled new particles, in decays of Z or Higgs bosons, could motivate dedicated detector designs that would increase the efficiency for reconstructing the unusual signatures of such processes. These studies are crucial input to the further optimisation of the two concepts described in the FCC-ee conceptual design report, CLD and IDEA, and to the development of new concepts which might actually prove to be better adapted to the FCC-ee physics programme, or parts thereof.
Highlights
Detectors for FCC-ee have to comply with the tight constraints imposed by the invasive machine detector interface [1]: the last focusing quadrupole is at two meters only from the interaction point (IP); the experiment magnetic field is constrained to be below 2 T for the run at the Z resonance; the angular coverage of the detector can not extend below 100 mrad from the beam axis, as this space is used by machine magnets
Send offprint requests to: Patrizia Azzi1, Emmanuel Perez2: Exploring requirements and detector solutions for FCC-ee at 1 m only from the interaction point, and the measurement starting at an angle of 65 mrad, the inner radius of the LumiCal must be known to 1.6 μm only [1]
An initial list of the requirements that a FCC-ee detector should fulfil, in order to match the physics programme offered by the huge statistics that will be collected, has been established
Summary
Detectors for FCC-ee have to comply with the tight constraints imposed by the invasive machine detector interface [1]: the last focusing quadrupole is at two meters only from the interaction point (IP); the experiment magnetic field is constrained to be below 2 T for the run at the Z resonance; the angular coverage of the detector can not extend below 100 mrad from the beam axis, as this space is used by machine magnets. The experimental environment, which is different from that of a linear collider in particular at the Z peak (high physics event rates, small bunch spacing), sets important constraints, preventing for example the use of pulsed electronics. The detector requirements imposed by the physics programme [2, 3], at 240 GeV and above, have already been studied extensively for the linear colliders, but will have to be revisited in the context of the FCC-ee environment. The specific discovery potential for very weakly coupled particles, offered by the huge FCC-ee statistics, should be kept in mind too when designing the detectors
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