Abstract
The physics reach and feasibility of the Future Circular Collider are currently being investigated in the form of a Conceptual Design Report. The ultimate goal of the FCC is to collide protons with a centre-of-mass energies of 100 TeV, thus extending the reach of the current HEP facilities. This high-energy regime opens new opportunities for the discovery of physics beyond the standard model, but also new constraints on the detector design. As at 100 TeV a large fraction of the W, Z, H bosons and top quarks are produced with a significant boost, it implies an efficient reconstruction of high energetic objects. The reconstruction of those boosted objects sets the calorimeter performance requirements in terms of energy resolution, containment of highly energetic hadron showers, and high transverse granularity. The detectors designed for the FCC experiments need to tackle harsh conditions of the unprecedented collision energy and instantaneous luminosity . They also must be able to deal with a very high number of collisions per bunch crossings (pile-up). Excellent energy and angular resolution, also for low energetic particles , are therefore needed in order to meet the demands based on the physics benchmarks like Higgs self-couplings. In this proceedings are presented the current baseline technologies for the calorimeter system of the FCC-hh reference detector and present first results of the performance studies with the combined calorimeters, meeting the energy resolution goal.
Highlights
The physics reach and feasibility of the Future Circular Collider are currently being investigated in the form of a Conceptual Design Report
The radiation level is mostly driven by the instantaneous luminosity which is a factor 100 larger than LHC
Direct production of heavy resonances can be probed up to masses of 40 TeV and supersymmetric top-partners up to 10 TeV. In addition to such heavy states, FCC-hh has a large programme of precision physics, complementary to an e+e− collider
Summary
Compared to LHC, the total inelastic cross-section only increases by a factor of 1.25. The radiation level is mostly driven by the instantaneous luminosity which is a factor 100 larger than LHC. It has implication on the radiation levels for the calorimeters as the 1 MeV neutron equivalence fluence would raise up to 4 × 1015(14) cm−2 in the barrel for the ECal (HCal) and up to 2 × 1016 cm−2 in the end-caps. Assuming 25 ns bunch spacing, the average number of pile-up collisions, ⟨μ⟩, is as high as 1000 in the ultimate scenario Mitigation of this high pile-up may be the most important challenge for the detectors and the reconstruction methods on the FCC-hh
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