First Measurement of the Atomic Electric Dipole Moment of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ra</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>225</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>

Parker, Richard H.; Dietrich, Matthew R.; Kalita, Mukut; Lemke, Nathan D.; Bailey, K.; Bishof, Michael; Greene, J. P.; Holt, R. J.; Korsch, W.; Lu, Zheng‐Tian; Müller, P.; O’Connor, Thomas P.; Singh, J.

doi:10.1103/physrevlett.114.233002

Cited by 138 publications

(96 citation statements)

References 35 publications

(48 reference statements)

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“…We obtain 225 Ra from the National Isotope Development Center at Oak Ridge National Laboratory. Our previous EDM measurement combined two separate data runs which used 3 mCi and 6 mCi shipments of 225 Ra respectively [17]. In the current measurement, we use a single 9 mCi shipment, which equates to 225 ng of 225 Ra.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, we reported the first measurement of the 225 Ra EDM [17], representing both the first EDM measurement using an atom with an octupole deformed nucleus and the first EDM measurement using laser-trapped atoms. Although the 95% confidence upper limit from this measurement is not yet competitive with that of 199 Hg for limiting CP violation in the nucleus according to current theoretical calculations [18], 225 Ra measurements have the potential to achieve rapid improvements by many orders of magnitude through a series of experimental upgrades.…”

Section: Introductionmentioning

confidence: 99%

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Improved limit on theRa225electric dipole moment

et al. 2016

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Background: Octupole-deformed nuclei, such as that of 225 Ra, are expected to amplify observable atomic electric dipole moments (EDMs) that arise from time-reversal and parity-violating interactions in the nuclear medium. In 2015, we reported the first "proof-of-principle" measurement of the 225 Ra atomic EDM.Purpose: This work reports on the first of several experimental upgrades to improve the statistical sensitivity of our 225 Ra EDM measurements by orders of magnitude and evaluates systematic effects that contribute to current and future levels of experimental sensitivity. Method: Laser-cooled and trapped225 Ra atoms are held between two high voltage electrodes in an ultra high vacuum chamber at the center of a magnetically shielded environment. We observe Larmor precession in a uniform magnetic field using nuclear-spin-dependent laser light scattering and look for a phase shift proportional to the applied electric field, which indicates the existence of an EDM. The main improvement to our measurement technique is an order of magnitude increase in spin precession time, which is enabled by an improved vacuum system and a reduction in trap-induced heating. Results: We have measured the225 Ra atomic EDM to be less than 1.4 × 10 −23 e cm (95% confidence upper limit), which is a factor of 36 improvement over our previous result. Conclusions:Our evaluation of systematic effects shows that this measurement is completely limited by statistical uncertainty. Combining this measurement technique with planned experimental upgrades we project a statistical sensitivity at the 1 × 10 −28 e cm level and a total systematic uncertainty at the 4 × 10 −29 e cm level.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved limit on theRa225electric dipole moment

et al. 2016

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“…As discussed below, for our purposes the latter can be interpreted as a constraint on the EDM of the electron, d e . Recently, a first measurement of the EDM of the atom 225 Ra, d Ra , has been reported [50], but the experiment is not precise enough to impact the constraints discussed below. The outlook of EDM experiments is very positive.…”

Section: Experimental Status and Prospectsmentioning

confidence: 99%

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Chien

Cirigliano

Dekens

et al. 2016

J. High Energ. Phys.

117

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Abstract:We investigate direct and indirect constraints on the complete set of anomalous CP-violating Higgs couplings to quarks and gluons originating from dimension-6 operators, by studying their signatures at the LHC and in electric dipole moments (EDMs). We show that existing uncertainties in hadronic and nuclear matrix elements have a significant impact on the interpretation of EDM experiments, and we quantify the improvements needed to fully exploit the power of EDM searches. Currently, the best bounds on the anomalous CP-violating Higgs interactions come from a combination of EDM measurements and the data from LHC Run 1. We argue that Higgs production cross section and branching ratios measurements at the LHC Run 2 will not improve the constraints significantly. On the other hand, the bounds on the couplings scale roughly linearly with EDM limits, so that future theoretical and experimental EDM developments can have a major impact in pinning down interactions of the Higgs.

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“…Neste mesmo trabalho, cálculos relativísticos também foram empregados como contra-prova ao valor experimental. Nota-se também a primeira medida experimental do momento de dipolo elétrico do átomo de 88 Ra [22], uma das grandes evidências já encontradas na busca de uma nova física além do Modelo Padrão. Novos estudos sobre colisões frias envolvendo este elemento deverão utilizar curvas de energia potencial teóricas do dímero Ra 2 recentemente publicadas com base em cálculos relativísticos [23].…”

Section: Uma Abordagem Histórica Da Química Relativística Computacionalunclassified

“…Mas, para este estudo, utilizou-se do conjunto RPF-4Z para todos os átomos dos sistemas considerados. Na Tabela 4.35, mostra-se o estudo de incremento com funções tight para a base RPF-4Z do 19 22 -0,6364 0,0000 -0,5705 0,0000 +2s 22,24 -0,6364 0,0000 -0,5705 0,0000 +1p 16 -0,6366 -0,0002 -0,5707 -0,0002 +2p 16,18 -0,6366 0,0000 -0,5707 0,0000 +1d 9 -0,6400 -0,0037 -0,5764 -0,0059 +2d 9,11 -0,6377 0,0023 -0,5729 0,0035 +3d *Valores mostrados com métodos correlacionados são obtidos pela soma do valor analítico em nível DG-HG com a contribuição da correlação eletrônica calculada no nível correspondente a cada linha nesta tabela pelo método numérico de dois pontos; †Estes são dados pela soma dos valores calculados em nível CCSD-T com uma correção para as excitações triplas iterativas com um espaço ativo menor que o utilizado nos demais cálculos; † †Cálculos em nível SF-DKH2-CCSD(T).…”

Section: Momento De Quadrupolo Elétrico Nuclear Do Potássiounclassified

Desenvolvimento de conjuntos polarizados de funções de base relativísticas Gaussianas e aplicações

Teodoro¹

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First Measurement of the Atomic Electric Dipole Moment ofRa225

Cited by 138 publications

References 35 publications

Improved limit on theRa225electric dipole moment

Improved limit on theRa225electric dipole moment

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Desenvolvimento de conjuntos polarizados de funções de base relativísticas Gaussianas e aplicações

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