High sensitivity tests of the Pauli Exclusion Principle with VIP2

TL;DR

The VIP2 experiment aims to test the Pauli Exclusion Principle with unprecedented sensitivity by searching for forbidden X-ray transitions in copper, potentially revealing tiny violations of this fundamental rule.

Contribution

This paper presents the VIP2 experiment, which improves the sensitivity of Pauli Exclusion Principle tests by orders of magnitude over previous experiments, using advanced detection methods.

Findings

VIP2 sets the most stringent limits on PEP violations to date.

The experiment employs novel detection techniques for higher sensitivity.

Comparison of different PEP tests highlights the advancements in experimental methods.

Abstract

The Pauli Exclusion Principle is one of the most fundamental rules of nature and represents a pillar of modern physics. According to many observations the Pauli Exclusion Principle must be extremely well fulfilled. Nevertheless, numerous experimental investigations were performed to search for a small violation of this principle. The VIP experiment at the Gran Sasso underground laboratory searched for Pauli-forbidden X-ray transitions in copper atoms using the Ramberg-Snow method and obtained the best limit so far. The follow-up experiment VIP2 is designed to reach even higher sensitivity. It aims to improve the limit by VIP by orders of magnitude. The experimental method, comparison of different PEP tests based on different assumptions and the developments for VIP2 are presented.