Formation of parity-nonconserving nuclear forces in the standard model SU(2)L × U(1) × SU(3)c

Dubovik, V.M.; Zenkin, Sergei V.

doi:10.1016/0003-4916(86)90021-7

Cited by 103 publications

(90 citation statements)

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“…[14] from specifying a result, and instead the outcome of the calculation was presented as a 'best guess' with an accompanying range of values. Subsequent calculations using the quark model [9,10], chiral solitons [7,8], and QCD sum rules [11][12][13] The lattice QCD calculation presented here uses anisotropic clover gauge configurations with 2 light quark flavors (the u and d quarks in the isospin limit, m u = m d ) and one heavier quark flavor (the s quark), at a pion mass of 389 MeV, spatial lattice spacing of 0.123 fm, and a temporal lattice spacing of 0.035 fm [18,19]. The lattices have total dimensions of (2.5 fm) 3 × 9 fm.…”

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confidence: 99%

Lattice QCD calculation of nuclear parity violation

Wasem

2012

Phys. Rev. C

117

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We present the first lattice QCD calculation of the leading-order momentum-independent parity violating coupling between pions and nucleons, h 1 πNN . The calculation performs measurements on dynamical anisotropic clover gauge configurations, with a spatial extent of L ∼ 2.5 fm, a spatial lattice spacing of as ∼ 0.123 fm, and a pion mass of mπ ∼ 389 MeV. While this first calculation does not include non-perturbative renormalization of the bare parity-violating operators, a chiral extrapolation to the physical pion mass, or contributions from disconnected (quark-loop) diagrams, these are expected to result in systematic errors within the quoted statistical error. We find a contribution from the 'connected' diagrams of h 1,con πNN = (1.099 ± 0.505 +0.058 −0.064 ) × 10 −7 , consistent with current experimental bounds and previous model-dependent theoretical predictions.

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confidence: 99%

Lattice QCD calculation of nuclear parity violation

Wasem

2012

Phys. Rev. C

117

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“…The weak couplings were calculated by Desplanques, Donoghue and Holstein [16], and subsequently by a number of other authors [18,19,20,21,22]. The range of calculated values is large, and an experimental determination is needed.…”

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confidence: 99%

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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“…The controversy [11], [12], [18], [19], [20] in calculating weak meson-nucleon coupling constants in nuclei has greatly stimulated the investigation of possible experiments sensitive to different components of the PNC interaction Hamiltonian (H P N C ), that depend linearly on seven such weak coupling constants: h among these are those for the parity mixed doublets (PMD) [11], [16]. The most interesting PMD cases are those for which the PNC effect is enhanced due to a small energy difference between the two states and due to a favourable ratio of the transition probabilities.…”

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“…where H P N C is the PNC Hamiltonian given by Desplanques, Donoghue and Holstein (DDH) [12], Dubovik and Zenkin (DZ) [18], Adelberger and Haxton (AH) [11] or Kaiser and Meissner (KM) [19].…”

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Parity mixed doublets inA=36 nuclei

Horoi

1994

Phys. Rev. C

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The γ-circular polarizations (P γ ) and asymmetries (A γ ) of the parity forbidden M1 + E2 γ-decays: 36 Cl * (J π = 2 − ; T = 1; E x = 1.95 MeV) → 36 Cl(J π = 2 + ; T = 1; g.s.) and 36 Ar * (J π = 2 − ; T = 0; E x = 4.97 MeV) → 36 Ar * (J π = 2 + ; T = 0; E x = 1.97 MeV) are investigated theoretically. We use the recently proposed Warburton-Becker-Brown shell-model interaction.For the weak forces we discuss comparatively different weak interaction models based on different assumptions for evaluating the weak meson-hadron coupling constants. The results determine a range of P γ values from which we find the most probable values: P γ = 1.1 · 10 −4 for 36 Cl and P γ = 3.5 · 10 −4 for 36 Ar.

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Formation of parity-nonconserving nuclear forces in the standard model SU(2)L × U(1) × SU(3)c

Cited by 103 publications

References 82 publications

Lattice QCD calculation of nuclear parity violation

Lattice QCD calculation of nuclear parity violation

Parity Violation in p⃗p and n⃗p Experiments

Parity mixed doublets inA=36 nuclei

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