Precision Measurement of Parity Nonconservation in Atomic Cesium: A Low-Energy Test of the Electroweak Theory

Noecker, M. C.; Masterson, B. P.; Wieman, Carl

doi:10.1103/physrevlett.61.310

Cited by 313 publications

(186 citation statements)

References 23 publications

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“…(2.2a) grows coherently with nucleon numbers N and Z. The second term, together with the anapole moment [5] term (which also depends upon σ B · α), amounts to at most a few percent of the first term in heavy atoms, and furthermore sums to zero when all hfs sublevels are combined, since all directions of σ B are then weighted equally. Thus in this paper we will consider the first term only.…”

Section: Pnc In the Standard Model A Theoretical Considerationsmentioning

confidence: 99%

Atomic parity nonconservation: Electroweak parameters and nuclear structure

1992

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There have been suggestions to measure atomic parity nonconservation (PNC) along an isotopic chain, by taking ratios of observables in order to cancel complicated atomic structure effects. Precise atomic PNC measurements could make a significant contribution to tests of the Standard Model at the level of one loop radiative corrections. However, the results also depend upon certain features of nuclear structure, such as the spatial distribution of neutrons in the nucleus. To examine the sensitivity to nuclear structure, we consider the case of Pb isotopes using various recent relativistic and non-relativistic nuclear model calculations. Contributions from nucleon internal weak structure are included, but found to be fairly negligible. The spread among present models in predicted sizes of nuclear structure effects may preclude using Pb isotope ratios to test the Standard Model at better than a one percent level, unless there are adequate independent tests of the nuclear models by various alternative strong and electroweak nuclear probes. On the other hand, sufficiently accurate atomic PNC experiments would provide a unique method to measure neutron distributions in heavy nuclei.1 12.15.Ji,12.15.Mm,31.10+z Typeset Using REVTEX

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Section: Pnc In the Standard Model A Theoretical Considerationsmentioning

confidence: 99%

Atomic parity nonconservation: Electroweak parameters and nuclear structure

1992

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“…in technicolor theories [36]{ [38] . In such a case, one can, for example, add to the analysis the ratio R of neutral to charged current processes in deep inelastic neutrino scattering on nuclei [39] , the \weak charge" Q W measured in atomic parity violation experiments on Cs [40] , and the measurement of g V =g A from e scattering [41] . In this way one obtains the global t (R b from ALEPH, sin 2 eff with enlarged error as in eq.…”

Section: A More Model-independent Approachmentioning

confidence: 99%

Status of Precision Tests of the Standard Model

Altarelli

1997

NATO ASI Series

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“…The present generation of experiments aim at observing nuclear spin-dependent efFects in the measurement of hyperffne (hf) components of the same E1 or M1 transition. These exceedingly diKcult experiments have reached an uncertainty less than 2'Fo [4]. It has revived interest in probing nuclear spin-and size-dependent efFects which are 2 orders of magnitude smaller as compared to the nuclear spin-independent parity nonconserving (PNC) eKect.…”

Section: Introductionmentioning

confidence: 99%

“…The nucleon weak axial current parameter of SM cannot be measured in highenergy experiments as it is highly suppressed compared with the nucleon weak charge parameter. This parameter entering in the nuclear weak axial current could have been extracted from the recent measurements [4]. But it has not been possible because of its mixing with another electron-nucleus weak interaction induced by PNC nucleon-nucleon (KIiI) interaction.…”

Section: Introductionmentioning

confidence: 99%

Relativistic mean-field approach to anapole moment: Atomic parity-violating hyperfine transitions

1995

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A generalized formula of nuclear anapole moment is derived using the current relativistic nuclear approach. The Dirac spin magnetization and the anomalous spin magnetization contributions to anapole moment are shown to be proportional to the second moment of respective magnetizations. The valence nucleon effective g~(g ) factors in a nucleus are obtained from the different phenomenological generalizations of relativistic nuclear magnetic moment. The unitary transformation approach is used to derive the parity nonconserving (PNC) perturbed wave functions. In the case of g~p arametrization, the anomalous spin magnetization and pion contributions to anapole moment are nearly two and three times the Dirac magnetization contribution respectively; while for g parametrization, all the three contributions are of the same order of magnitude. Using these calculated values of anapole moment and available atomic structure data from published literature, the Cs PNC hyper6ne amplitudes are calculated. The results are closer to the experimental data, particularly when the measured value of ImE~~' /P is used. The optical rotation angles induced by nuclear spin dependent PNC interaction are also calculated.

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Precision Measurement of Parity Nonconservation in Atomic Cesium: A Low-Energy Test of the Electroweak Theory

Cited by 313 publications

References 23 publications

Atomic parity nonconservation: Electroweak parameters and nuclear structure

Atomic parity nonconservation: Electroweak parameters and nuclear structure

Status of Precision Tests of the Standard Model

Relativistic mean-field approach to anapole moment: Atomic parity-violating hyperfine transitions

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