Search for a signature of Pauli exclusion principle violation by VIP-2. (1st August 2022)

• Record Type: Journal Article
• Authors: De Paolis, L; Napolitano, F; Bartalucci, S; Bazzi, M; Bertolucci, S; Bragadireanu, M; Capoccia, C; Cargnelli, M; Clozza, A; Del Grande, R; Fiorini, C; Guaraldo, C; Iliescu, M; Laubenstein, M; Marton, J; Miliucci, M; Milotti, E; Piscicchia, K; Porcelli, A; Scordo, A; Shi, H; Sirghi, D L; Sirghi, F; Sgaramella, F; Zmeskal, J; Curceanu, C
• Is Part Of: Physica scripta. Volume 97:Number 8(2022)
• Publication Date: 2022-08-01
• Subjects: VIP-2 -- Pauli exclusion principle -- Pauli exclusion principle violation -- close encounters -- VIP -- violation of Pauli; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/ac76ec
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: The VIP-2 experiment performs a high sensitivity test of the Pauli Exclusion Principle for electrons, and is operated in the ultra-low cosmic background environment of the Gran Sasso Underground Laboratories of INFN. The experimental technique consists in testing the symmetry state of an open, continuously supplied, system of fermions; thus representing the only spin-statistics test which strictly fulfills the Messiah-Greenberg superselection rule. In April 2019, VIP-2 started the ongoing data taking campaign in its final layout, with the goal to improve the previous VIP result of at least two orders of magnitude. Before April 2019, VIP-2 collected, in a partial configuration of the external shielding complex, two sets of data in 2018–2019 for a total duration of about 208 days. We present in this work the results of the analyses of the first two data sets collected by VIP-2, which already improve the VIP result by one order of magnitude. The results are also interpreted in the framework of a diffusion random walk model, which provides a significantly enhanced description of the electrons-atoms close encounters process, and hence a boost on the estimated limit on the Pauli Exclusion Principle violation probability.