Abstract
Discrete symmetries tested in high precision atomic physics experiments provide guidance to model building beyond the Standard Model (SM). Here experimental opportunities arise for searches for permanent electric dipole moments (EDMs) and measurements of atomic parity violation (APV). Heavy atoms are favorable for such experiments since symmetry violating effects in atoms increase faster than the third power of the nuclear charge Z. Of special interest are isotopes of the heavy alkaline earth element radium (Z=88) since they offer large enhancement factors for EDMs and provide a new experimental road towards high precision measurements of atomic parity violation. These opportunities are exploited at the TRIμP facility at KVI, Groningen.
Highlights
The Standard Model (SM) comprises the knowledge of physics over a wide range of energies and different interactions
Its success is visible through predictions which were verified by experimental observations
All experimental observed phenomena are accommodated by the theory, but the SM does not provide explanations for them, e.g. the origin of parity violation or the matter-antimatter asymmetry in the universe [1]
Summary
The Standard Model (SM) comprises the knowledge of physics over a wide range of energies and different interactions. Experimental limits on violations of discrete symmetries, i.e. parity (P), particle-antiparticle symmetry (charge conjugation, C) and time reversal (T) provide sensitive tests of the range of validity of the SM which guide theoretical model building beyond the SM. The heavy alkaline earth element radium is at the focus of this paper This system is preferred since symmetry violating effects scale with higher powers of the nuclear charge Z due to the larger number of coherently contributing particles and relativistic effects [2, 3]. The rate of Ra+ after the TI is up to 5×104/s depending on the isotope These isotopes are exploited in our searches for permanent electric dipole moments and measurements of atomic parity violation
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