Parity and Time-Reversal Violation in Atomic Systems

Roberts, B. M.; Dzuba, V. A.; Flambaum, V. V.

doi:10.1146/annurev-nucl-102014-022331

Cited by 96 publications

(92 citation statements)

References 214 publications

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“…Taking into account the recent atomic structure calculation [160], the experimental value of the weak charge of 133 55 Cs is given by [85] Q exp Comparing this with Eq. (5.14), we obtain the corresponding 2σ bounds on λ ed and λ ed as a function of the LQ mass as follows:…”

Section: Atomic Parity Violationmentioning

confidence: 99%

Non-standard interactions in radiative neutrino mass models

Babu

Dev

Jana

et al. 2020

J. High Energ. Phys.

136

126

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Models of radiative Majorana neutrino masses require new scalars and/or fermions to induce lepton number violating interactions. We show that these new particles also generate observable neutrino nonstandard interactions (NSI) with matter. We classify radiative models as type-I or II, with type-I models containing at least one Standard Model (SM) particle inside the loop diagram generating neutrino mass, and type-II models having no SM particle inside the loop. While type-II radiative models do not generate NSI at tree-level, popular models which fall under the type-I category are shown, somewhat surprisingly, to generate observable NSI at tree-level, while being consistent with direct and indirect constraints from colliders, electroweak precision data and charged-lepton flavor violation (cLFV). We survey such models where neutrino masses arise at one, two and three loops. In the prototypical Zee model which generates neutrino masses via one-loop diagrams involving charged scalars, we find that diagonal NSI can be as large as (8%, 3.8%, 9.3%) for (ε ee , ε µµ , ε τ τ ), while off-diagonal NSI can be at most (1.5 × 10 −3 %, 0.56%, 0.34%) for (ε eµ , ε eτ , ε µτ ). In one-loop neutrino mass models using leptoquarks (LQs), (ε µµ , ε τ τ ) can be as large as (21.6%, 51.7%), while ε ee and (ε eµ , ε eτ , ε µτ ) can at most be 0.6%. Other twoand three-loop LQ models are found to give NSI of similar strength. The most stringent constraints on the diagonal NSI are found to come from neutrino oscillation and scattering experiments, while the off-diagonal NSI are mostly constrained by low-energy processes, such as atomic parity violation and cLFV. We also comment on the future sensitivity of these radiative models in long-baseline neutrino experiments, such as DUNE. While our analysis is focused on radiative neutrino mass models, it essentially covers all NSI possibilities with heavy mediators. arXiv:1907.09498v2 [hep-ph] 3 Oct 2019 Contents 7 Other type-I radiative models 76 7.1 One-loop models 77 7.1.1 Minimal radiative inverse seesaw model 77 7.1.2 One-loop model with vectorlike leptons 80 7.1.3 SU (2) L -singlet leptoquark model with vectorlike quark 82 7.1.4 SU (2) L -doublet leptoquark model with vectorlike quark 83 7.1.5 Model with SU (2) L -triplet leptoquark and vectorlike quark 84 7.1.6 A new extended one-loop leptoquark model 85 7.2 Two-loop models 87 7.2.1 Zee-Babu model 87 7.2.2 Leptoquark/diquark variant of the Zee-Babu model 88 7.2.3 Model with SU (2) L -doublet and singlet leptoquarks 89 7.2.4 Leptoquark model with SU (2) L -singlet vectorlike quark 90 7.2.5 Angelic model 91 7.2.6 Model with singlet scalar and vectorlike quark 92 7.2.7 Leptoquark model with vectorlike lepton 93 7.2.8 Leptoquark model with SU (2) L -doublet vectorlike quark 93 7.2.9 A new two-loop leptoquark model 94 7.3 Three-loop models 95 7.3.1 KNT Model 95 7.3.2 AKS model 96 7.3.3 Cocktail Model 97 7.3.4 Leptoquark variant of the KNT model 98 -ii -7.3.5 SU (2) L -singlet three-loop model 99 7.4 Four-and higher-loop models 100 8 Type II r...

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Section: Atomic Parity Violationmentioning

confidence: 99%

Non-standard interactions in radiative neutrino mass models

Babu

Dev

Jana

et al. 2020

J. High Energ. Phys.

136

126

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“…The most promising experimental observable to probe the CP violation of new physics is the electric dipole moment (EDM) [6][7][8][9][10][11][12][13][14][15][16]. The EDM is measurable in many systems, and many experimental measurements were done so far, including the neutron [17], atoms [18][19][20][21][22], molecules [23,24], etc.…”

Section: Introductionmentioning

confidence: 99%

Electric dipole moment of C13

et al. 2017

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We calculate for the first time the electric dipole moment (EDM) of 13 C generated by the isovector CP-odd pion exchange nuclear force in the α-cluster model, which describes well the structures of low lying states of the 13 C nucleus. The linear dependence of the EDM of 13 C on the neutron EDM and the isovector CP-odd nuclear coupling is found to be d13 C = −0.33dn − 0.0020Ḡ(1) π . The linear enhancement factor of the CP-odd nuclear coupling is smaller than that of the deuteron, due to the difference of the structure between the 1/2 − 1 state and the opposite parity (1/2 + ) states. We clarify the role of the structure played in the enhancement of the EDM. This result provides good guiding principles to search for other nuclei with large enhancement factor. We also mention the role of the EDM of 13 C in determining the new physics beyond the standard model.

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“…The investigation of weak-force-induced effects in atomic systems has been the focus of experiments in the last four decades (see, for example, reviews [2][3][4]). The first experiments were motivated by the work of Bouchiat and Bouchiat [5] which showed that weak-interactioninduced observables in atoms are enhanced and therefore are detectable in systems with large atomic number.…”

Section: Introductionmentioning

confidence: 99%

Isotopic variation of parity violation in atomic ytterbium: Description of the measurement method and analysis of systematic effects

et al. 2019

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We present a detailed description of experimental studies of the parity violation effect in an isotopic chain of atomic ytterbium (Yb), whose results were reported in a recent Letter [Antypas et al., Nat. Phys. 15, 120 (2019) [1]]. We discuss the principle of these measurements, made on the Yb 6s 2 1 S0 →5d6s 3 D1 optical transition at 408 nm, describe the experimental apparatus, and give a detailed account of our studies of systematic effects in the experiment. Our results offer the first direct observation of the isotopic variation in the atomic parity violation effect, a variation which is in agreement with the prediction of the Standard Model. These measurements are used to constrain electron-proton and electron-neutron interactions, mediated by a light Z boson.

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Parity and Time-Reversal Violation in Atomic Systems

Cited by 96 publications

References 214 publications

Non-standard interactions in radiative neutrino mass models

Non-standard interactions in radiative neutrino mass models

Electric dipole moment of C13

Isotopic variation of parity violation in atomic ytterbium: Description of the measurement method and analysis of systematic effects

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