Parity-violating interaction effects: The longitudinal asymmetry in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pp</mml:mi></mml:math>elastic scattering

Carlson, J.; Schiavilla, R.; Brown, Virginia; Gibson, Benjamin F.

doi:10.1103/physrevc.65.035502

Cited by 55 publications

(110 citation statements)

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“…The present is the third in a series of papers dealing with the theoretical investigation of PV interaction effects in two-nucleon systems. The first [6] was devoted to pp elastic scattering, and presented a calculation of the longitudinal asymmetry induced by PV interactions in the lab-energy range 0-350 MeV. The second [7] provided a rather cursory account of a study of the PV asymmetries in np radiative capture at thermal neutron energies and in deuteron electro-disintegration at quasi-elastic kinematics.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Parity-violating interaction effects in thenpsystem

2004

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“…The lower solid line is the total A z calculated by Driscoll and Miller [23] using the DDH [16] weak couplings. The upper solid line is from a calculation by Carlson et al [24] using adjusted values of the weak couplings.…”

Section: Interpretation Of the Resultsmentioning

confidence: 99%

“…Figure 2 shows A z as a function of energy, broken down into contributions from various partial wave mixings [23]. Since the parity is (−1) ℓ , where ℓ is the orbital angular momentum, one would not normally expect partial [24] using the AV18 potential [25] and CD-Bonn strong couplings [26]. (Figure modified from [14]) .…”

Section: Interpretation Of the Resultsmentioning

confidence: 99%

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Parity Violation in p⃗p and n⃗p Experiments

Ramsay¹

2003

AIP Conference Proceedings

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Parity violation experiments involving only two nucleons provide a way to study the non-leptonic, strangeness-conserving part of the weak interaction in a clean measurement free of nuclear structure uncertainties. Such measurements are particularly appropriate for discussion at this conference as their success depends critically on the ability to accurately control and measure spin. Although simple in principle, the experiments are technically very demanding and great pains must be taken both in the preparation of the incident polarized beams and the measurement of the resultant parity violating asymmetries, which may be masked by a multitude of systematic effects. At low and intermediate energies, pp experiments are sensitive to the medium range part of the parity violating nucleon-nucleon force, usually parameterized in terms of rho and omega meson exchange. The pion does not contribute to parity violation in the pp experiments, as the π 0 is its own antiparticle and parity violation would also imply CP violation. I review existing pp measurements with particular emphasis on the recent 221 MeV pp measurement at TRIUMF which permitted the weak meson-nucleon coupling constants h pp ρ and h pp ω to be determined separately for the first time. The np experiments, on the other hand, are used to extract the weak pion nucleon coupling, f π , describing the longest range part of the parity violating nucleonnucleon force. The np system is the only two nucleon system that is sensitive to f π . I also review these experiments, with specific details of the np → dγ experiment now under preparation at Los Alamos National Laboratory.

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Parity violation in nuclear systems

Desplanques

2005

From Parity Violation to Hadronic Structure and More

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Parity-violating interaction effects: The longitudinal asymmetry inppelastic scattering

Cited by 55 publications

References 35 publications

Parity-violating interaction effects in thenpsystem

Parity-violating interaction effects in thenpsystem

Parity Violation in p⃗p and n⃗p Experiments

Parity violation in nuclear systems

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