Precise Test of Electroweak Theory from a New Measurement of Parity Nonconservation in Atomic Thallium

Vetter, Paul; Meekhof, D. M.; Majumder, P. K.; Lamoreaux, S. K.; Fortson, E. N.

doi:10.1103/physrevlett.74.2658

Cited by 273 publications

(272 citation statements)

References 20 publications

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“…(20) This scaled value is in agreement with the measurement [1], where a nearly identical value of χ was used, and all three values are in agreement with the theoretical result (18) for the Q W = Q SM W . We use the best experimental result [1] together with our calculation (18) to derive the experimental value of the weak charge for 205 Tl: …”

Section: Discussionsupporting

confidence: 78%

“…The thallium atom is the second simplest atom where parity non-conservation (PNC) has been observed [1,2]. The simplest and best understood such atom is cesium, where theory has the accuracy of 1% [3,4] (see also more recent calculations [5,6,7]).…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we report a new calculation of the PNC E1-amplitude for the 6p 1/2 → 6p 3/2 transition in thallium. Combining this new calculation with the most accurate experiment [1], leads to a value of the weak charge of the 205 Tl nucleus that can also be compared with the standard model prediction [9]:…”

Section: Introductionmentioning

confidence: 99%

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Parity nonconservation in thallium

2001

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We report a new calculation of the parity non-conserving E1 amplitude for the 6p 1/2 → 6p 3/2 transition in 205 Tl. Our result for the reduced matrix element is E1PNC = −(66.7 ± 1.7) · i 10 −11 (−QW /N ) a.u.. Comparison with the experiment of Vetter et al. [Phys. Rev. Letts. 74, 2658] gives the following result for the weak charge of 205 Tl: QW /Q SM W = 0.97 (±0.01)expt (±0.03) theor , where Q SM W = −116.7 ± 0.1 is the standard model prediction. This result confirms an earlier conclusion based on the analysis of a Cs experiment that atomic PNC experiments are in agreement with the standard model.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Parity nonconservation in thallium

2001

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“…The highlight of these efforts was the 0.35% precision measurement of nuclear-spin-independent PNC in Cs, and the 14% precision measurement of the nuclear spin-dependent PNC for the odd-proton nucleus of 133 Cs [4]. However, measurement of the anapole moment in Cs disagrees with Tl [4,5], and also with some theoretical nuclear calculations ([9-11] and references therein). To help resolve these inconsistencies, and to improve the atomic PNC tests of the standard model, further experiments are needed.…”

mentioning

confidence: 99%

“…In recent decades, successful atomic PNC measurements have been performed using two techniques: (a) the Stark interference technique, on Cs [4], and (b) the optical rotation technique, on Tl, Bi, and Pb [5][6][7][8]. The highlight of these efforts was the 0.35% precision measurement of nuclear-spin-independent PNC in Cs, and the 14% precision measurement of the nuclear spin-dependent PNC for the odd-proton nucleus of 133 Cs [4].…”

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confidence: 99%

Calculation of parity-nonconserving optical rotation in iodine at 1315 nm

et al. 2013

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We examine the feasibility of a parity non-conserving (PNC) optical rotation experiment for the 2 P 3/2 → 2 P 1/2 transition of atomic iodine at 1315 nm. The calculated E1PNC to M 1 amplitude ratio is R = 0.80(16) × 10 −8 . We show that very large PNC rotations (greater than 10 µrad) are obtained for iodine-atom column densities of ∼ 10 22 cm −2 , which can be produced by increasing the effective interaction pathlength by a factor of ∼ 10 4 with a high-finesse optical cavity. The simulated signals indicate that measurement of the nuclear anapole moment is feasible, and that a 1% PNC precision measurement should resolve the inconsistency between previous measurements in Cs and Tl. [5][6][7][8]. The highlight of these efforts was the 0.35% precision measurement of nuclear-spin-independent PNC in Cs, and the 14% precision measurement of the nuclear spin-dependent PNC for the odd-proton nucleus of 133 Cs [4]. However, measurement of the anapole moment in Cs disagrees with Tl [4,5], and also with some theoretical nuclear calculations ([9-11] and references therein). To help resolve these inconsistencies, and to improve the atomic PNC tests of the standard model, further experiments are needed. For example, there is a proposal to measure the nuclear anapole moment using the PNC-generated hyperfine frequency shift of dressed states in atoms [12], with particular proposals for Cs [13] and Fr [14]. However, for other PNC candidates, as the precision in the atomic theory is not expected to significantly surpass the current experimental or theoretical PNC precision of Cs, future PNC experiments have focused on other fruitful directions, such as the measurement of atomic PNC on a chain of isotopes [9,15], or the measurement of nuclear anapole moments. Therefore, along these lines, PNC experiments are in progress on Yb and Dy at Berkeley [16,17], on Rb and Fr at the Tri-University Meson Facility (TRIUMF, University of British Columbia) [18,19], on Ra + at KVI Groningen [20], and on Ba + at the University of Washington, Seattle [21]. Recently, Bougas et al.

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