Parity-violating electron-deuteron scattering

Diaconescu, L.; Schiavilla, R.; Kolck, U. van

doi:10.1103/physrevc.63.044007

Cited by 19 publications

(20 citation statements)

References 37 publications

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“…Note that in Ref. [31] the relativistic corrections in j 5 i and twobody axial currents were neglected, in line with the expectation, confirmed in the present study, that the associated contributions were small. Finally, the neutral weak currents given above are at tree-level, electro-weak radiative corrections as well as strange-quark contributions to the vector and axial-vector currents [30] have been ignored.…”

Section: B Neutral Weak Currentssupporting

confidence: 76%

“…[31], where it was shown that twobody terms in the nuclear electromagnetic and weak neutral currents only produce (1-2)% corrections to the asymmetry due to the corresponding single-nucleon currents. The present study-a short account of which has been published in Ref.…”

Section: Deuteron Electro-disintegration At Quasi-elastic Kinematicsmentioning

confidence: 99%

“…Standard manipulations then lead to the following expression for the asymmetry in the extreme relativistic limit for the electron [31,45] …”

Section: A Longitudinal Asymmetry and Spin Rotation In Np Elastic Scmentioning

confidence: 99%

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Parity-violating interaction effects in thenpsystem

2004

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We investigate parity-violating observables in the np system, including the longitudinal asymmetry and neutron-spin rotation in np elastic scattering, the photon asymmetry in np radiative capture, and the asymmetries in deuteron photo-disintegration d( γ, n)p in the threshold region and electrodisintegration d( e, e ′ )np in quasi-elastic kinematics. To have an estimate of the model dependence for the various predictions, a number of different, latest-generation strong-interaction potentials-Argonne v 18 , Bonn 2000, and Nijmegen I-are used in combination with a weak-interaction potential consisting of π-, ρ-, and ω-meson exchanges-the model known as DDH. The complete bound and scattering problems in the presence of parity-conserving, including electromagnetic, and parity-violating potentials is solved in both configuration and momentum space. The issue of electromagnetic current conservation is examined carefully. We find large cancellations between the asymmetries induced by the parity-violating interactions and those arising from the associated pion-exchange currents. In the np capture, the model dependence is nevertheless quite small, because of constraints arising through the Siegert evaluation of the relevant E 1 matrix elements. In quasi-elastic electron scattering these processes are found to be insignificant compared to the asymmetry produced by γ-Z interference on individual nucleons. These two experiments, then, provide clean probes of different aspects of weakinteraction physics associated with parity violation in the np system. Finally, we find that the neutron spin rotation in np elastic scattering and asymmetry in deuteron disintegration by circularly-polarized photons exhibit significant sensitivity both to the values used for the weak vector-meson couplings in the DDH model and to the input strong-interaction potential adopted in the calculation. This reinforces the conclusion that these short-ranged meson couplings are not in themselves physical observables, rather the parity-violating 1 mixings are the physically relevant parameters. 21.30.+y, 25.40.Cm

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Section: B Neutral Weak Currentssupporting

confidence: 76%

Section: Deuteron Electro-disintegration At Quasi-elastic Kinematicsmentioning

confidence: 99%

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Parity-violating interaction effects in thenpsystem

2004

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“…Nuclear corrections can potentially modify the asymmetry, both through parity-conserving [ 15], and parity-violating [ 16,17] two-body effects. At the SAMPLE kinematics the PC terms modify the asymmetry by 1-3%, and the PV terms are negligible.…”

Section: Sample At Mit-batesmentioning

confidence: 99%

Parity violation with electrons and hadrons

BEISE¹

2004

Nuclear Physics A

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A key question in understanding the structure of nucleons involves the role of sea quarks in their ground state electromagnetic properties such as charge and magnetism. Parity-violating electron scattering, when combined with determination of nucleon electromagnetic form factors from parity-conserving e-N scattering, provides another degree of freedom to separately determine the up, down and strange quark contributions to nucleon electromagnetic structure. Strange quarks are unique in that they are exclusively in the nucleon's sea. A program of experiments using parity violating electron scattering has been underway for approximately a decade, and results are beginning to emerge. This paper is a brief overview of the various experiments and their results to date along with a short-term outlook of what can be anticipated from experiments in the next few years.

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“…The quasi-elastic deuterium asymmetry is dependent upon both the momentum and the energy transfer and is modified by nucleon-nucleon interaction effects. The coefficients were determined using a calculation provided by R. Schiavilla [Sch06,SCP04] in which he used the AV18 nucleon-nucleon interaction model as described in [DSvK01]. The calculation included lowest-order relativistic corrections to the one-body electromagnetic and weak currents.…”

Section: Calculation Of the Deuterium Coefficients Is Not As Straightmentioning

confidence: 99%

Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-Violating Electron Scattering

Ellis

2010

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The G 0 backward angle experiment, completed in Hall C of the Thomas Jefferson National Accelerator Facility (TJNAF), measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q 2 = 0.22 and 0.63 (GeV/c) 2 . The asymmetries are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of ≤ 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. This was also the first measurement of the anapole moment effects in the axial-vector current at these four-momentum transfers.

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Parity-violating electron-deuteron scattering

Cited by 19 publications

References 37 publications

Parity-violating interaction effects in thenpsystem

Parity-violating interaction effects in thenpsystem

Parity violation with electrons and hadrons

Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-Violating Electron Scattering

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