VIP2 experiment

The experiment is located in the underground laboratory of Gran Sasso, LNGS-INFN, near the town L'Aquila in Italy.

[1] The different approaches to investigate the Pauli exclusion principle need to be distinguished concerning their possible fulfillment of the Messiah–Greenberg superselection rule.

One way to fulfill this rule and test the Pauli exclusion principle with high precision is to introduce "new" electrons in a conductor.

The experiment is taking data in stable conditions since summer 2016 in the Gran Sasso underground laboratory.

With the data taken until the end of 2020, an intermediate upper limit can be set for the probability that the Pauli exclusion principle is violated in an atom of[6] The VIP-2 experiment is in 2023 in its last year of operation.

Comparison of normal (left) and non-Paulian (right) atomic 2p to 1s transitions.
VIP collaboration group picture at the experiment site at LNGS in November 2015.