Further measurements of parity non-conservation in inelastic electron scattering

Prescott, C.Y.; Atwood, W. B.; Cottrell, R.L.A.; DeStaebler, H.; Garwin, E. L.; Gonidec, A.; Miller, R.H.; Rochester, L.S.; Sato, T.; Sherden, D. J.; Sinclair, C. K.; Stein, Stephen J.; Taylor, Richard E.; Young, C.; Clendenin, J. E.; Hugnes, V.W.; Sasao, N.; Schüler, K. P.; Borghini, M.; Lübelsmeyer, K.; Jentschke, W.

doi:10.1016/0370-2693(79)91253-x

Cited by 371 publications

(143 citation statements)

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“…The growth for x B near one is a result of the relatively quicker fall off with x B of the pdfs; the twist-four contribution in the numerator is falling less quickly in this region. 2 One can also perform this analysis with alternative parametrizations of the structure function moments. This was done in Ref.…”

Section: Model Estimates Of Higher Twist Effectsmentioning

confidence: 99%

“…In the 1970s parity-violating deep-inelastic scattering (PVDIS) of longitudinally polarized electrons from deuterium played an important role in confirming the standard model (SM) of particle physics [1][2][3]. The asymmetry,…”

Section: Introductionmentioning

confidence: 99%

“…In SCET in the Breit frame, at leading order in the power counting in 2 QCD /Q 2 and at tree level, the four-quark operator in W du µν will be matched onto a SCET operator [45], dγ µ d(x)ūγ ν u(0)…”

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confidence: 99%

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Examination of higher-order twist contributions in parity-violating deep-inelastic electron-deuteron scattering

2010

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We show that parity-violating deep-inelastic scattering (PVDIS) of longitudinally polarized electrons from deuterium can in principle be a relatively clean probe of higher twist quark-quark correlations beyond the parton model. As first observed by Bjorken and Wolfenstein, the dominant contribution to the electron polarization asymmetry, proportional to the axial vector electron coupling, receives corrections at twist four from the matrix element of a single four-quark operator. We reformulate the Bjorken-Wolfenstein argument in a matter suitable for the interpretation of experiments planned at the Thomas Jefferson National Accelerator Facility (JLab). In particular, we observe that because the contribution of the relevant twist-four operator satisfies the CallanGross relation, the ratio of parity-violating longitudinal and transverse cross sections, R γ Z , is identical to that for purely electromagnetic scattering, R γ , up to perturbative and power-suppressed contributions. This result simplifies the interpretation of the asymmetry in terms of other possible novel hadronic and electroweak contributions. We use the results of MIT Bag Model calculations to estimate contributions of the relevant twist-four operator to the leading term in the asymmetry as a function of Bjorken x and Q 2 . We compare these estimates with possible leading twist corrections from violation of charge symmetry in the parton distribution functions.

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Section: Model Estimates Of Higher Twist Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Examination of higher-order twist contributions in parity-violating deep-inelastic electron-deuteron scattering

2010

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“…In the late 70's, Prescott et al 1,2 showed, by measuring the non-zero asymmetry A LR = (σ L − σ R )/(σ L + σ R ) for polarized electron-deuterium deep inelastic scattering, that the weak neutral current violates parity . The experiment also set limits on the dependence of A LR on the variable y ≡ (E − E )/E, which ruled out models invented to explain the negative results of the early atom parity violation (APV) experiments.…”

Section: Introductionmentioning

confidence: 99%

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

Souder

2016

Int. J. Mod. Phys. Conf. Ser.

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We discuss precision measurements of PVDIS with the upgraded JLab 12 GeV beam by using a Solenoidal Large Iintensity Device (SoLID). The unique feature of SoLID, combining high luminosity and large acceptance, makes it possible to reach the high precision needed to have a high impact by using PVDIS to probe physics beyond the Standard Model. A measurement of PVDIS in deuterium will determine a fundamental coupling constant that is inaccessible with other means. PVDIS measurements can also access a number of topics in QCD physics, including searching for charge symmetry violation in the parton distribution functions, determining the d/u ratio in the proton without nuclear effects, and a clean extraction of higher-twist effects due to quark-quark correlations. SoLID allows a full exploitation of the physics potential of the JLab 12 GeV upgrade. In addition to PVDIS, it has a set of approved highly-rated experiments to study nucleon transverse spin and transverse structure by using polarized semi-inclusive DIS and to study non-perturbative gluon dynamics with J/Ψ production near threshold. A brief description of the SoLID spectrometer is also given.

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“…The technique was originally used to verify the nature of the weak neutral-current [1,2], and more recently has been used to bound the size of the strange quark contribution to the nucleon form factors [3,4,5,6,7,8], verify the existence of a "neutron-skin" in 208 Pb [9,10], and to do precision tests of the Standard Model of particle physics [11,12]. Asymmetries measured in experiments so far have ranged from ∼200 parts-per-million (ppm) down to ∼0.2 ppm, depending on the physical process and kinematics.…”

Section: Introductionmentioning

confidence: 99%

Demands on polarized electron sources by future experiments in parity violating electron scattering

Dalton¹

2014

Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)

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The next generation of parity-violating electron-scattering experiments at Jefferson Lab will require even greater control of the electron beam under polarization reversal. These experiments require faster transitions between polarization states with smaller associated changes in the beam. In this paper, recent experience at Jefferson Lab is reviewed and the requirements of future experiments are discussed. Potential developments are briefly examined, including the possible use of a Kerr cell to change the helicity of the laser and hence the electron beam.

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Further measurements of parity non-conservation in inelastic electron scattering

Abstract: We have extended our earlier measurements of parity violating asymmetries in the inelastic scattering of longitudinally polarized * Work supported by the Department EY-76-C-03-0515.

Cited by 371 publications

References 4 publications

Examination of higher-order twist contributions in parity-violating deep-inelastic electron-deuteron scattering

Examination of higher-order twist contributions in parity-violating deep-inelastic electron-deuteron scattering

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

Demands on polarized electron sources by future experiments in parity violating electron scattering

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