UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-23 18:08
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Conference: Bucharest University Faculty of Physics 2014 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
Experiments for the study of neutrino oscillations - (2)


Authors:
Ionel LAZANU, Alexandru Catalin ENE


Affiliation:
University of Bucharest, Faculty of Physics, Atomic and Nuclear Physics Chair


E-mail
aime_silenz@yahoo.com


Keywords:
astroparticle physics, neutrino oscillations, large underground detector


Abstract:
In recent years, experiments concerning neutrino oscillations have revealed, with great statistics, that the solar neutrino problem and the atmospheric neutrino anomaly are not caused by poor detection methods or by a poor theoretical understanding of the phenomena taking place within the sun or of the cosmic rays bombarding the atmosphere, but by this novel phenomenon, named neutrino oscillations. The cause of this phenomenon lies in the way that the mass and flavour eigenstates of the neutrino interact. A flavour eigenstate of the neutrino can be expressed as a linear combination of the three mass eigenstates. If the eigenvalues of the neutrino mass eigenstates differ, then the energy of the mass eigenstates differ too and, so, if we consider the mass eigenstates as behaving like plane waves, then they will propagate at different phase velocities, causing the neutrinos to oscillate through the flavour eigenstates. Though we, now, have some understanding of this phenomenon, including many of the parameters involved, we still don’t know the mass hierarchy or if CP is violated. The LAGUNA-LBNO (Large Apparatus studying Grand Unification and Neutrino Astrophysics - Long Baseline Neutrino Oscillations) is an experiment designed to study these matters using beams of neutrinos and antineutrinos from CERN that will traverse the Earth and be detected at a far site (possibly Slănic, România, too). These neutrinos will oscillate due to matter effects through the Earth. Careful study of the data obtained with this experiment should provide a greater understanding of the mass hierarchy problem and the CP violation. In this work, we have obtained some theoretical predictions for the neutrino oscillation probabilities for the CERN-Slănic baseline (1540 km), using the parameters published by LAGUNA-LBNO and different CP violation scenarios.