# The time-of-propagation counter for Belle II

Source: [The time-of-propagation counter for Belle II](<https://www.sota2.com/research/paper/68fa3a491e209131ce8c9503>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T23:58:38.326Z

Authors: K. Nishimura

Published: 2010-09-04T21:41:53.000Z

## Abstract

The Belle II detector operating at the future upgrade to the KEKB accelerator will perform high-statistics precision investigations into the flavor sector of the Standard Model. As charged hadron identification is a vital element of the experiment's success, the time-of-propagation (TOP) counter has been chosen as the primary particle identification device in the barrel region of Belle II. The TOP counter is a compact variant of the detection of internally reflected Cherenkov light (DIRC) technique and relies heavily on exquisite single photon timing resolution with micro-channel plate photomultiplier tubes. We discuss the general principles of TOP operation and optimization of the Belle II TOP configuration, which is expected to provide 4 sigma or better separation of kaons and pions up to momenta of approximately 4 GeV/c.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1009.0876>)

[PDF](<https://arxiv.org/pdf/1009.0876.pdf>)