Pump-probe measurement of atomic parity violation in cesium with a precision of 2.6%
- 70 Downloads
We present the atomic parity violation measurements made in Cs vapour using a pump-probe scheme. After pulsed excitation of the 6S -7S forbidden transition in the presence of a longitudinal electric field, a laser beam resonant with one of the 7S -6P transitions stimulates the 7S atom emission for a duration of 20ns. The polarisation of the amplified probe beam is analysed. A seven-fold signature allows discrimination of the parity-violating linear dichroism, and real-time calibration by a similar, known, parity-conserving linear dichroism. The zero-field linear dichroism signal due to the magnetic dipole transition moment is observed for the first time, and used for in situ determination of the electric field. The result, ImE 1 pv = (- 808±21)×10-14 ea 0 , is in perfect agreement with the corresponding, more precise measurement obtained by the Boulder group. A transverse field configuration with large probe amplification could bring atomic parity violation measurements to the 0.1% accuracy level.
PACS.32.80.Ys Weak-interaction effects in atoms 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries 33.55.Be Zeeman and Stark effects 42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption
Unable to display preview. Download preview PDF.
- 2.M.A. Bouchiat, C. Bouchiat, J. Phys. (Paris) 35, 899 (1974).Google Scholar
- 3.See B. Frois, M.A. Bouchiat (Editors), Parity violation in atoms and polarized electron scattering (World Scientific, Singapore, 1999)Google Scholar
- 27.M.A. Bouchiat, (in French) unpublished.Google Scholar
- 28.A. Derevianko, this conference.Google Scholar