https://doi.org/10.1140/epjc/s10052-024-13717-2
Regular Article - Experimental Physics
Timing-based mass measurement of exotic long-lived particles at the FCC-ee
1
IRFU, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette cedex, France
2
CERN, Geneva, Switzerland
3
INFN Sezione di Pavia, Via Bassi 6, 27100, Pavia, Italy
Received:
3
October
2024
Accepted:
15
December
2024
Published online:
9
January
2025
The very high luminosity run foreseen at the Z-pole for the FCC-ee will allow the detection in Z decays of new particles with very low couplings to the Standard Model. These particles can have measurable flight paths before they decay. If the timing and the position of the decay vertex can be measured with high precision, the mass of such particles can be measured by exploiting the constrained kinematics of an collider. The mass resolution achievable with this technique is studied through a detailed analysis in the framework of a parametrised simulation of the performance of the IDEA detector. The adopted benchmark model is the production of Heavy Neutral Leptons, which is one of the key channels for new physics discovery at the FCC-ee.
© The Author(s) 2025
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