dorsal/arxiv
View SchemaCylindrical Symmetry Discrimination of Magnetoelectric Optical Systematic Effects in a Pump-probe Atomic Parity Violation Experiment
| Authors | M-A. Bouchiat, J. Guéna, M. Lintz |
|---|---|
| Categories | |
| ArXiv ID | physics/0311101 |
| URL | https://arxiv.org/abs/physics/0311101 |
| DOI | 10.1140/epjd/e2004-00021-7 |
Abstract
A pump-probe atomic parity violation (APV) experiment performed in a longitudinal electric field, provides a signal breaking mirror symmetry while preserving the cylindrical symmetry of the set-up. The excited vapor acts on the probe beam as a linear dichroic amplifier, imprinting a very specific signature on the detected signal. Our differential polarimeter is oriented to yield a null result unless the excited atoms are endowed with a chirality of some kind. Ideally, only the APV (E-odd) and the calibration (E-even) signals contribute to a chiral atomic response, a situation highly favourable to the detection of a tiny effect. In the present work we give a thorough analysis of possible unwanted defects like stray transverse fields or misalignments which would spoil the ideal set-up and lead to chiral systematics. A possible way to suppress such effects is to perform global rotations of the experiment by incremental steps of 45 degrees, leaving both stray fields and misalignments unaltered. The conspiration of at least two defects is necessary to affect the E-odd polarimeter signal. The transverse nature of the defects manifests itself by an azimuthal cosine square modulation. The harmful systematics are those which survive the averaging over four successive configurations. They require the presence of a stray transverse electric field, which can be determined and eventually minimized by auxiliary measurements of the systematic effects, amplified by applying a known external magnetic field. Transverse stray magnetic fields must be compensated by a similar procedure. We also propose statistical correlation tests as diagnoses of the aforementioned systematic effects.
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"abstract": "A pump-probe atomic parity violation (APV) experiment performed in a\nlongitudinal electric field, provides a signal breaking mirror symmetry while\npreserving the cylindrical symmetry of the set-up. The excited vapor acts on\nthe probe beam as a linear dichroic amplifier, imprinting a very specific\nsignature on the detected signal. Our differential polarimeter is oriented to\nyield a null result unless the excited atoms are endowed with a chirality of\nsome kind. Ideally, only the APV (E-odd) and the calibration (E-even) signals\ncontribute to a chiral atomic response, a situation highly favourable to the\ndetection of a tiny effect. In the present work we give a thorough analysis of\npossible unwanted defects like stray transverse fields or misalignments which\nwould spoil the ideal set-up and lead to chiral systematics. A possible way to\nsuppress such effects is to perform global rotations of the experiment by\nincremental steps of 45 degrees, leaving both stray fields and misalignments\nunaltered. The conspiration of at least two defects is necessary to affect the\nE-odd polarimeter signal. The transverse nature of the defects manifests itself\nby an azimuthal cosine square modulation. The harmful systematics are those\nwhich survive the averaging over four successive configurations. They require\nthe presence of a stray transverse electric field, which can be determined and\neventually minimized by auxiliary measurements of the systematic effects,\namplified by applying a known external magnetic field. Transverse stray\nmagnetic fields must be compensated by a similar procedure. We also propose\nstatistical correlation tests as diagnoses of the aforementioned systematic\neffects.",
"arxiv_id": "physics/0311101",
"authors": [
"M-A. Bouchiat",
"J. Gu\u00e9na",
"M. Lintz"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1140/epjd/e2004-00021-7",
"title": "Cylindrical Symmetry Discrimination of Magnetoelectric Optical Systematic Effects in a Pump-probe Atomic Parity Violation Experiment",
"url": "https://arxiv.org/abs/physics/0311101"
},
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