Parity- and Time-Reversal-Violating Nuclear Forces

Vries, Jordy de; Epelbaum, E.; Girlanda, L.; Gnech, Alex; Mereghetti, Emanuele; Viviani, M.

doi:10.3389/fphy.2020.00218

Cited by 31 publications

(13 citation statements)

References 241 publications

(544 reference statements)

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“…This correction was not applied here to compensate to some extent for the lack of the SRG renormalization. One should also explore the sensitivity of the results to the form of the PNC interaction by applying the recently derived chiral PV nuclear forces [64]. Given the good basis size convergence of both κ A and κ ax found in the present calculations, we can be optimistic that uncertainties of nuclear calculations for light nuclei can be reduced to ∼10% once the above improvements are implemented.…”

Section: Sionless Coupling Constant κmentioning

confidence: 85%

Nuclear spin-dependent parity-violating effects in light polyatomic molecules

et al. 2020

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Measurements of nuclear spin-dependent parity-violating (NSD-PV) effects provide an excellent opportunity to test nuclear models and to search for physics beyond the Standard Model. Molecules possess closely spaced states with opposite parity which may be easily tuned to degeneracy to greatly enhance the observed parity-violating effects. A high-sensitivity measurement of NSD-PV effects using light triatomic molecules is in preparation [E. B. Norrgard et al., Commun. Phys. 2, 77 (2019)]. Importantly, by comparing these measurements in light nuclei with prior and ongoing measurements in heavier systems, the contribution to NSD-PV from Z 0 -boson exchange between the electrons and the nuclei may be separated from the contribution of the nuclear anapole moment. Furthermore, light triatomic molecules offer the possibility to search for new particles, such as the postulated Z boson. In this work, we detail a sensitive measurement scheme and present high-accuracy molecular and nuclear calculations needed for interpretation of NSD-PV experiments on triatomic molecules composed of light elements, Be, Mg, N, and C. The ab initio nuclear structure calculations, performed within the no-core shell model provide a reliable prediction of the magnitude of different contributions to the NSD-PV effects in the four nuclei. These results differ significantly from the predictions of the standard single-particle model and highlight the importance of including many-body effects in such calculations. In order to extract the NSD-PV contributions from measurements, a parity-violating interaction parameter W PV , which depends on the molecular structure, needs to be known with a high accuracy. We have calculated these parameters for the triatomic molecules of interest using the relativistic coupled-cluster approach. In order to facilitate the interpretation of future experiments we provide uncertainties on the calculated parameters. A scheme for measurement using laser-cooled polyatomic molecules in a molecular fountain is presented, along with an estimate of the expected sensitivity of such an experiment. This experimental scheme, combined with the presented state-of-the-art calculations, opens exciting prospects for a measurement of the anapole moment and the PV effects due to the electron-nucleon interactions with unprecedented accuracy and for a new path towards detection of signatures of physics beyond the Standard Model.

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Section: Sionless Coupling Constant κmentioning

confidence: 85%

Nuclear spin-dependent parity-violating effects in light polyatomic molecules

et al. 2020

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“…This would allow for similar spin dependent effects with known azimuthal dependence to be added to Geant4. Such changes are especially useful for the simulation of other parity violating effects, a growing sub-branch of nuclear physics studies [15].…”

Section: Discussionmentioning

confidence: 99%

Simulation of the spatial shift in detector response for polarized protons within a calorimeter

Blitstein,

Wojtsekhowski

2021

Preprint

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Measurement of the helicity dependent elastic electron-proton scattering cross section provides a key means of investigating parity violation within the proton. However, such measurements exhibit potential instrumental effects associated with the detection of polarized recoiled protons. In particular, spin-orbit interactions within a massive detector induce a systematic spatial shift in the detector signal. In this study, we determine the size of this shift using the Geant4 simulation toolkit. For a typical hadron calorimeter, we found a polarization dependent shift on the order of 0.01-0.1 mm, multiple orders of magnitude smaller than the typical spatial resolution seen in hadronic calorimeters. Additionally, we provide the custom modifications required of the Geant4 source code to implement the quasi-elastic scattering of polarized protons incident on nuclei in the detector. The modifications are readily extendable to generic matter sources, and can be used for the study of additional spin dependent observables in Geant4.

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“…A clear distinction of the GF (where photons are scattered from stored ion beams) from existing gamma sources based on laser‐light backscattering from an electron beam is the possibility to probe specifically hadronic P ‐violating, T ‐conserving (PVTC), and P ‐ and T ‐violating (PVTV) interactions. [ 103 ] The experiment will consist in counting the number of the generated secondary photons as a function of the circular polarization of the primary light.…”

Section: P‐ and Cp$cp$‐violating Compton Scattering Of Primary Photon...mentioning

confidence: 99%

Expanding Nuclear Physics Horizons with the Gamma Factory

et al. 2022

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The Gamma Factory (GF) is an ambitious proposal, currently explored within the CERN Physics Beyond Colliders program, for a source of photons with energies up to ≈400 MeV and photon fluxes (up to ≈1017 photons s−1) exceeding those of the currently available gamma sources by orders of magnitude. The high‐energy (secondary) photons are produced via resonant scattering of the primary laser photons by highly relativistic partially‐stripped ions circulating in the accelerator. The secondary photons are emitted in a narrow cone and the energy of the beam can be monochromatized, down to 10−3–10−6 level, via collimation, at the expense of the photon flux. This paper surveys the new opportunities that may be afforded by the GF in nuclear physics and related fields.

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Parity- and Time-Reversal-Violating Nuclear Forces

Cited by 31 publications

References 241 publications

Nuclear spin-dependent parity-violating effects in light polyatomic molecules

Nuclear spin-dependent parity-violating effects in light polyatomic molecules

Simulation of the spatial shift in detector response for polarized protons within a calorimeter

Expanding Nuclear Physics Horizons with the Gamma Factory

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