# Demonstration of a 25-picosecond single-photon time resolution with gaseous photomultiplication

## TL;DR

This paper demonstrates that gaseous photomultiplier detectors based on resistive plate chambers can achieve a single-photon time resolution of approximately 25 picoseconds, promising for high-precision photon detection.

## Contribution

The study presents a prototype RPC-based photodetector with a LaB$_6$ photocathode achieving 25 ps time resolution for single photons, a significant improvement in gaseous detector performance.

## Key findings

- Achieved 25 ps time resolution for single photons
- Demonstrated effective use of LaB$_6$ photocathode in RPCs
- Validated detector performance with picosecond laser testing

## Abstract

Photosensitive gaseous detectors with a simple photoelectron multiplication mechanism of resistive plate chambers (RPCs) are expected to have both a large photocoverage and an excellent time resolution and to be low-cost. To demonstrate the time resolution of the RPC-based photodetectors, we built a prototype detector with a LaB$_6$ photocathode. It was tested with a picosecond pulse laser and the intrinsic time resolution for single photons was measured to be $25.0 \pm 1.1$ ps at a gain of $3.3 \times 10^6$.