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In the VIP2 (VIolation of the Pauli Exlusion Principle) experiment at theGran Sasso underground laboratory (LNGS) we are searching for possibleviolations of standard quantum mechanics predictions. With high precision weinvestigate the Pauli Exclusion Principle and the collapse of the wave function(collapse models). We will present our experimental method of searching forpossible small violations of the Pauli Exclusion Principle for electrons, viathe search for "anomalous" X-ray transitions in copper atoms, produced by "new"electrons (brought inside a copper bar by circulating current) which could havethe probability to undergo Pauli-forbidden transition to the ground state (1 slevel) already occupied by two electrons. We will describe the concept of theVIP2 experiment taking data at LNGS presently. The goal of VIP2 is to test thePEP for electrons with unprecedented accuracy, down to a limit in theprobability that PEP is violated at the level of 10$^{-31}$. We will showpreliminary experimental results obtained at LNGS and discuss implications of apossible violation.

VIP2 at Gran Sasso - Test of the validity of the spin statistics theorem for electrons with X-ray spectroscopy