Speaker
Description
The Future Circular electron–positron Collider (FCC-ee) will operate as a high-luminosity circular electron–positron collider, providing precise measurements of the Z, W, and Higgs bosons, as well as the top quark. To fully exploit this environment, the inner tracker must reconstruct charged-particle trajectories with high precision across a wide momentum range while keeping the material budget low to limit multiple scattering. Furthermore, the tracker needs to provide robust particle identification capabilities to distinguish among different charged particles.
We propose a straw tracker for the inner tracker of FCC-ee experiments, such as ALLEGRO. Combined with a high-resolution pixel vertex detector and an outer silicon strip tracker, it provides O(100) precise position measurements per track while keeping the material budget low. The design achieves a transverse momentum resolution of 0.1–0.2% at 45 GeV and an angular resolution of O(0.1 mrad). It also enables particle identification via measuring the energy loss (dE/dx) or the number of primary ionization clusters (dN/dx), allowing separation of charged hadrons across a broad momentum range from O(100 MeV) to O(40 GeV).
This presentation will cover the development of the straw tracker for the FCC-ee inner tracking system. Results from detailed simulations of its expected performance will be presented, along with measurements from cosmic muon studies and recent test-beam campaigns. These studies demonstrate the feasibility of the design and highlight its potential to provide precise tracking and particle identification for future FCC-ee experiments.
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