Progress toward an EDM measurement in 225Ra

Ahmad, I.; Bailey, K.; Graner, B.; Greene, J. P.; Korsch, W.; Lu, Zheng‐Tian; Müller, P.; O’Connor, Thomas P.; Sulai, Ibrahim; Trimble, W.

doi:10.1016/j.nuclphysa.2010.05.013

Cited by 22 publications

(25 citation statements)

References 13 publications

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“…We find that for sufficiently large masses, the entire dependence of the ratio R on the carrier mass can be well approximated by taking only a single channel contribution in the EDM sum over states (16). This is the contribution from the excitation of the outer-most occupied orbital |a = 6s 1/2 to the excited orbitals |s = np 1/2 , (n = 6, 7, .…”

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confidence: 94%

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Dark forces and atomic electric dipole moments

Gharibnejad

Derevianko

2015

Phys. Rev. D

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Postulating the existence of a finite-mass mediator of T,P-odd coupling between atomic electrons and nucleons we consider its effect on permanent electric dipole moment (EDM) of diamagnetic atoms. We present both numerical and analytical analysis for such mediator-induced EDMs and compare it with EDM results for the conventional contact interaction. Based on this analysis we derive limits on coupling strengths and carrier masses from experimental limits on EDM of 199 Hg atom.

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confidence: 94%

“…While we will use the Hg EDM result for putting constraints on the light mediators, the formalism and derived analytical expressions are applicable to other diamagnetic systems, such as the atoms of current experimental interest: xenon [11], ytterbium [12,13], radon [14], and radium [15,16].…”

Section: Introductionmentioning

confidence: 99%

Dark forces and atomic electric dipole moments

Gharibnejad

Derevianko

2015

Phys. Rev. D

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“…Preparatory work with the radium atom towards measurements of fundamental symmetries violations is in progress at Argonne National Laboratory (USA) [1] and Kernfysisch Versneller Instituut (The Netherlands) [2]. Studies of the parity and time-reversal violating atomic electric dipole moment (EDM) and atomic parity violation (APV) are particularly attractive in radium due to orders of magnitude enhancement of the effects, arising from both nuclear and electronic mechanisms: the presence of octupole deformation of the nucleus may lead to several-hundred times nuclear enhancement of the EDM in radium in the electronic ground state compared to mercury (see, e.g., [3,4]), for which the best limit on an atomic EDM has been placed [5]; the presence of anomalously close electronic levels of opposite parity may lead to orders of magnitude electronic enhancement of EDM effects in metastable states and APV effects in certain transitions [6,7].…”

Section: Introductionmentioning

confidence: 99%

Spectra of barium, radium, and element 120: Application of the combined correlation-potential, singles-doubles, and configuration-interactionab initiomethods

Ginges

Dzuba

2015

Phys. Rev. A

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We apply a version of the recently developed approach combining the correlation potential, linearized singles-doubles coupled-cluster, and the configuration interaction methods to the spectra of the heavy alkaline earths barium, radium, and element 120. Quantum electrodynamics radiative corrections are included. We have found unprecedented agreement between ab initio theory and experiment for the spectra of barium and radium, and we make accurate predictions for missing and unreliable data for all three atoms.

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“…However, the atom's electrons shield any nonzero EDM which the nucleus may possess and weaken the constraint thereby placed on the existence of new sources of CP violation. It has become possible to study the EDMs of very heavy atoms, such as 225 Ra [23] or 221/223 Rn [24], that mitigate the cancelling effect of electron shielding through their large Z, finite nuclear size, and octupole deformation [25]. The evasion of electron shielding in 225 Ra is estimated to be some seven hundred times bigger than that in 199 Hg [26], making these systems excellent candidates for the discovery of a nonzero EDM.…”

Section: Heavy-atom Edmsmentioning

confidence: 99%

An overview of neV probes of PeV scale physics – and of what's in between

Gardner

Plaster

2014

EPJ Web of Conferences

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Abstract. Low-energy experiments which would identify departures from the Standard Model (SM) rely either on the unexpected observation of symmetry breaking, such as of CP or B, or on an observed significant deviation from a precise SM prediction. We discuss examples of each search strategy, and show that low-energy experiments can open windows on physics far beyond accessible collider energies. We consider how the use of a frequentist analysis framework can redress the impact of theoretical uncertainties in such searchesand how lattice QCD can help control them. ContextDirect searches for new physics at the LHC has yielded the discovery of the Higgs boson [1, 2], but no unanticipated, new particles -as yet. On the other hand, observational cosmology, analyzed in the framework of general relativity, tells us that only 4% of the energy density of the universe is in the matter we know [3], so that the SM of particle physics, successful though it is, is probably incomplete. The lack of evidence thus far for new physics and interactions through collider studies at the highest energies motivates broader thinking in the search for new physics. For example, the missing matter could be weakly coupled, making it more challenging if not impossible to identify in a collider environment. Low-energy, precision searches for new physics can also probe this alternative possibility and thus play a key role in the search for new physics. In this contribution we offer a terse overview of the diverse program these experiments comprise.Generally, there are two distinct search strategies. That is, one can either make null tests of the breaking of SM symmetries, or refine the measurement of quantities which can be computed, or assessed, precisely with the SM. In the former case, one can test, e.g., B-L invariance by searching for nn oscillations or neutrinoless double-decay. Although CP is not a symmetry of the SM, there are nevertheless observables for which the SM prediction is so small that searches at current levels of sensitivity also constitute null tests. Searches for permanent electric dipole moments (EDMs) of the neutron or electron, e.g., or for CP violation in the charm sector, be it through DD mixing or decay rate a

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Progress toward an EDM measurement in 225Ra

Cited by 22 publications

References 13 publications

Dark forces and atomic electric dipole moments

Dark forces and atomic electric dipole moments

Spectra of barium, radium, and element 120: Application of the combined correlation-potential, singles-doubles, and configuration-interactionab initiomethods

An overview of neV probes of PeV scale physics – and of what's in between

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