Development of a low-mass and high-efficiency charged particle detector

Abstract

We developed a low-mass and high-efficiency charged particle detector for an experimental study of the rare decay $K_L\to {\pi }^0\nu \bar{\nu }$. The detector is important to suppress the background with charged particles to the level below the signal branching ratio predicted by the Standard Model (O(10${}^{-11}$)). The detector consists of two layers of 3-mm-thick plastic scintillators with wavelength shifting fibers embedded and Multi Pixel Photon Counters for readout. We manufactured the counter and evaluated the performance such as light yield, timing resolution, and efficiency. With this design, we achieved the inefficiency per layer against penetrating charged particles to be less than $1.5\times 10^{-5}$, which satisfies the requirement of the KOTO experiment determined from simulation studies.

20 pages, 18 figures

References in corpus (1)

• Two-Loop Electroweak Corrections for the K -> pi nu anti-nu Decays

Cited by in corpus (9)

• Search for $K_L\to {\pi }^0\nu \overline{\nu }$ and $K_L\to {\pi }^0{X}^0$ Decays at the J-PARC KOTO Experiment
• Study of the $K_L\to {\pi }^0\nu \overline{\nu }$ Decay at the J-PARC KOTO Experiment
• A new search for the $K_L\to {\pi }^0\nu \overline{\nu }$ and $K_L\to {\pi }^0{X}^0$ decays
• Search for the $K_L\to {\pi }^0\nu \bar{\nu }$ Decay at the J-PARC KOTO Experiment
• Long-lived neutral-kaon flux measurement for the KOTO experiment
• High-sensitivity low-noise photodetector using large-area silicon photomultiplier
• First Search for the $K_L\to {\pi }^0\gamma$ Decay
• Search for the Pair Production of Dark Particles $X$ with $K_L^0\to XX$, $X\to \gamma \gamma$
• The Search for $K_L\to {\pi }^0{\pi }^0\gamma \gamma$ and $K_L\to {\pi }^0{\pi }^{0}X$ where $X\to 2\gamma$ at the KOTO Experiment