Parity Violation in Deep Inelastic Scattering with the SoLID Spectrometer at JLab

Souder, P. A.

doi:10.1142/s2010194516600776

Cited by 19 publications

(19 citation statements)

References 17 publications

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“…Numerically, the difference between the MS definition and sin 2 θ l eff is small and only mildly mt dependent. 0.5% level [201]. Most recently, the Qweak collaboration published a measurement using a beam of longitudinally polarized electrons accelerated to 1.16 GeV on an unpolarized liquid hydrogen target [202], resulting in a precision of 5% at a momentum transfer of 157 MeV, i.e., in the elastic regime.…”

Section: Low Energy Observablesmentioning

confidence: 99%

Electroweak precision tests of the Standard Model after the discovery of the Higgs boson

Erler

Schott

2019

Progress in Particle and Nuclear Physics

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The global fit of the Standard Model predictions to electroweak precision data, which has been routinely performed in the past decades by several groups, led to the prediction of the top quark and the Higgs boson masses before their respective discoveries. With the measurement of the Higgs boson mass at the Large Hadron Collider (LHC) in 2012 by the ATLAS and CMS collaborations, the last free parameter of the Standard Model of particle physics has been fixed, and the global electroweak fit can be used to test the full internal consistency of the electroweak sector of the Standard Model and constrain models beyond. In this article, we review the current state-of-the-art theoretical calculations, as well as the precision measurements performed at the LHC, and interpret them within the context of the global electroweak fit. Special focus is drawn in the impact of the Higgs boson mass on the fit.

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Section: Low Energy Observablesmentioning

confidence: 99%

Electroweak precision tests of the Standard Model after the discovery of the Higgs boson

Erler

Schott

2019

Progress in Particle and Nuclear Physics

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“…In light atoms, additional parity-violating mechanisms become important or even dominate. One such effect is the exchange of the SM Z 0 boson (or potential yet undiscovered Z bosons) between an electron and individual nucleons [9], which remains poorly characterized despite the great strides recently in electron-scattering experiments [10,11]. Therefore, NSD-PV measurements in light nuclei are sensitive tests of the SM and may be used to search for new particles such as Z bosons and particles contributing to electroweak radiative corrections.…”

Section: Introductionmentioning

confidence: 99%

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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“…Knowledge of the beam polarization is an important source of experimental uncertainty in * Corresponding author Email address: gaskelld@jlab.org (D. Gaskell) 1 Deceased these experiments. Future measurements [1,2,3] will require 0.5% precision in the beam polarization. Advances in electron-beam polarimetry are a key driver for the future improvements in precision spin physics.…”

Section: Introductionmentioning

confidence: 99%

A novel comparison of Møller and Compton electron-beam polarimeters

et al. 2017

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We have performed a novel comparison between electron-beam polarimeters based on Møller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents (< 5 µA) during the Q weak experiment in Hall C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 µA) operation of the Compton polarimeter. All measurements were found to be consistent within experimental uncertainties of 1% or less, demonstrating that electron polarization does not depend significantly on the beam current. This result lends confidence to the common practice of applying Møller measurements made at low beam currents to physics experiments performed at higher beam currents. The agreement between two polarimetry techniques based on independent physical processes sets an important benchmark for future precision asymmetry measurements that require sub-1% precision in polarimetry.

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Parity Violation in Deep Inelastic Scattering with the SoLID Spectrometer at JLab

Cited by 19 publications

References 17 publications

Electroweak precision tests of the Standard Model after the discovery of the Higgs boson

Electroweak precision tests of the Standard Model after the discovery of the Higgs boson

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

A novel comparison of Møller and Compton electron-beam polarimeters

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