What question did this study set out to answer?

The aim is to evaluate how the MIP Timing Detector improves particle time measurements and vertex reconstruction accuracy.

February 2, 2026Open Access

Enhancing Particle Reconstruction and Identification with the MIP Timing Detector at CMS

Key Points

The aim is to evaluate how the MIP Timing Detector improves particle time measurements and vertex reconstruction accuracy.
Assessment of the MIP Timing Detector's time resolution capabilities
Analysis of track path length resolution's impact on time-of-flight calculations
Evaluation of particle identification performance in relation to timing accuracy
Estimated track path length resolution at CMS is reported
Demonstrates that the path length resolution is less critical than the detector's time resolution
Improvements in time-of-flight measurements enhance overall particle reconstruction efforts

Abstract

The MIP Timing Detector that will be installed at the CMS experiment is a novel kind of detector which will assign times to charged particles with an unprecedented resolution of 30-60 ps. This will allow vertex reconstruction in 4D, an essential feature to perform pileup mitigation in the high vertex multiplicity environment which is going to characterize the High-Luminosity phase of the LHC. In this contribution, we explore the impact of the track path length resolution in the computation of the time-of-flight, which is a crucial factor that comes into play when computing precise time information at the vertex. In addition to that, a summary of the particle identification performance and its impact on the track time resolution will be reported. The results presented here provide the first estimate of the track path length resolution in CMS and demonstrate that its effect is subdominant when compared to the time resolution of the detector.

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