Antonio Di Domenico (Rome):
Hunting for CPT symmetry and Quantum Mechanics violations
in neutral meson systems
Abstract:
CPT symmetry, i.e. the symmetry under
the combination of charge conjugation, parity, and time reversal transformations,
experimentally appears to be the only discrete symmetry of Quantum Mechanics
respected in Nature. Even though this result has a very solid theoretical
foundation in the well known CPT theorem  which holds for standard quantum
field theories formulated on flat spacetimes  tiny CPT violation effects
could be justified in the framework of a quantum theory of gravity with non
trivial spacetime topologies, in some cases implying a loss of quantum
coherence in single and entangled states.
Therefore the discovery of CPT
violation would have dramatic consequences on our present theoretical picture
and would definitely constitute an unambiguous signal of New Physics beyond
the Standard Model.
In this lecture the last and more
refined experimental searches for CPT violation effects will be reviewed with
a special focus on the tests performed on neutral meson systems and the
interplay between CPT symmetry and the basic principles of Quantum
Mechanics.
So far no deviation from the
expectations of CPT symmetry and Quantum Mechanics is observed, while the
precision of the measurements, in some cases, reaches the interesting Planck
scale region, where CPT violation effects driven by quantum gravity might show
up.
Finally, prospects for this kind of
experimental studies will be presented.
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