29 July 2018 to 4 August 2018
Russian Academy of Sciences
Europe/Moscow timezone

The TOP counter of Belle II: status and first results

30 Jul 2018, 10:05
Russian Academy of Sciences

Russian Academy of Sciences

Leninsky Prospekt, 32а Moscow 119071 Russian Federation
oral presentation [20+5 min] Cherenkov light imaging in particle and nuclear physics experiments Cherenkov light imaging in particle and nuclear physics experiments


Umberto Tamponi (INFN Torino)


High-efficiency and high-purity particle identification are fundamental requirements for the success of the Belle II experiment, whose main goal is to explore the new-physics scenarios in the CP-violating decays of the B mesons.
To achieve the required PID performances, the Time-of-propagation counter (TOP) has been installed in the central barrel region. This unique device consists in 16 bars of fused silica that act simultaneously as radiator and as light guide for the Cerenkov light. Unlike in the DIRC detectors, the PID information is mostly extracted measuring the time of propagation of the Cherenkov light in the radiator rather than its purely geometrical patterns.
We will present here a general overview of the status of the TOP counter, including the estimation of the time resolution, the calibration strategies and performances, and the first result obtained in the commissioning phase, both using cosmic rays and e+e- collision events collected during the "Phase II"
pilot run of the Belle II experiment.
These are the first measurements of the particle identification performances of a time-of-propagation detector in a full HEP experimental setup.

Primary author

Umberto Tamponi (INFN Torino)

Presentation Materials

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