Testing the Pauli Exclusion Principle with the VIP-2 Experiment

Violations of the Pauli Exclusion Principle (PEP), albeit small, could be motivated by physics beyond Standard Model, ranging from violation Lorentz invariance to extra space dimensions. This scenario can experimentally constrained through dedicated, state-of-the-art X-ray spectroscopy, searching for a forbidden atomic transition L shell K already occupied two electrons. The VIP-2 Experiment located at underground Gran Sasso National Laboratories INFN (Italy) tests PEP violations introducing new electrons via direct current in copper conductor, measuring energies silicon drift detector. Bayesian and frequentist analyses approximately six months data taken with fully operational setup is presented, setting strongest limit date on shown VIP collaboration. upper bound are placed 90% CL β2/2≤6.8×10−42 approach, β2/2≤7.1×10−42 CLs technique.