Hadronic parity violation

Haxton, W. C.; Holstein, Barry R.

doi:10.1016/j.ppnp.2013.03.009

Cited by 78 publications

(130 citation statements)

References 70 publications

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“…Much work has gone into constraining the PV NN force from a variety of nuclear experiments, see Refs. [8,9] for recent reviews.The prevailing paradigm in such analyses is based on single-meson exchange between nucleons, most commonly in the framework developed by Desplanques, Donoghue, and Holstein (DDH) [10]. The quantum numbers of the exchanged mesons determine the operator structures that contribute, while operator coefficients involve products of strong and weak meson-nucleonnucleon coupling constants.…”

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confidence: 99%

Parity-Violating Nucleon-Nucleon Force in the1/NcExpansion

2015

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Several experimental investigations have observed parity violation in nuclear systems-a consequence of the weak force between quarks. We apply the 1/Nc expansion of QCD to the P-violating T-conserving component of the nucleon-nucleon (NN) potential. We show there are two leadingorder operators, both of which affect pp scattering at order Nc. We find an additional four operators at order N 0 c sin 2 θW and six at O(1/Nc). Pion exchange in the PV NN force is suppressed by 1/Nc and sin 2 θW , providing a quantitative explanation for its non-observation up to this time. The large-Nc hierarchy of other PV NN force mechanisms is consistent with estimates of the couplings in phenomenological models. The PV observed in pp scattering data is compatible with natural values for the strong and weak coupling constants: there is no evidence of fine tuning. The strong-nuclear and electromagnetic forces play the most prominent role in proton-proton (pp) scattering. There are also parity-violating (PV) pp interactions, which manifest the presence of weak interactions between the quarks inside each proton. Measurements of longitudinal beam asymmetries ∼ 10 and TRIUMF [3] demonstrate that PV nucleon-nucleon (NN) forces exist. PV in NN systems is also probed via an asymmetry in the reaction np → dγ [4,5]. And ab initio calculations of few-nucleon systems allow us to take models of the PV NN force and predict, e.g., the longitudinal asymmetry in 3 He( n, p) 3 H [6], which is soon to be measured [7]. Nuclear parity violation is also observed in, e.g., the radiative decay of the first excited state of 19 F, but there theoretical uncertainties in the relationship between the observable and the model of the PV NN force are harder to quantify. Much work has gone into constraining the PV NN force from a variety of nuclear experiments, see Refs. [8,9] for recent reviews.The prevailing paradigm in such analyses is based on single-meson exchange between nucleons, most commonly in the framework developed by Desplanques, Donoghue, and Holstein (DDH) [10]. The quantum numbers of the exchanged mesons determine the operator structures that contribute, while operator coefficients involve products of strong and weak meson-nucleonnucleon coupling constants. In this paper we show that Standard Model (SM) couplings and the 1/N c expansion of QCD predict the operators, and the sizes of the associated coefficients, which appear in the PV NN potential.An alternative framework-suitable for studying PV at very low energies-that systematizes pioneering studies [11,12] has recently emerged [13][14][15], but has, as yet, been applied to far fewer experiments. The extension of chiral perturbation theory to few-nucleon systems, χEFT [16] has also been invoked [17][18][19][20][21]. In χEFT the one-pion-exchange piece of the PV NN force dominates, with all other effects suppressed by two orders in the chiral expansion.One-pion exchange gives the long-distance parityconserving potential, and drives many of the properties of light nuclei. But, thus far, experiment...

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confidence: 99%

Parity-Violating Nucleon-Nucleon Force in the1/NcExpansion

2015

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“…The calculations presented here form part of a comprehensive effort to analyze and interpret hadronic parity violation in few-nucleon systems. There are a number of further observables in four-and five-nucleon systems, such as an asymmetry in p 4 He scattering 06001-p. 3 EPJ Web of Conferences or the neutron spin rotation angle in a 4 He target, for which experimental results exist [21,22]. Consistent EFT calculations for these observables are very desirable and would provide important additional information.…”

Section: Discussionmentioning

confidence: 99%

Hadronic Parity Violation in Few-Nucleon Systems

Schindler

2013

Few-Body Syst

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Abstract. The weak interaction between quarks induces a parity-violating component in the interactions between nucleons, which is expected to be suppressed by a factor of about 10 −7 to 10 −6 compared to the dominant parity-conserving part of the interaction. A theoretical framework to analyze and interpret parity-violating observables in few-nucleon systems is described and selected results are presented.

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“…There have also been many phenomenological calculations related to hadronic parity violation, see a recent review [19]. In particular, recently extensive analysis of the parity violation in the neutronproton system [20] and for the longitudinal asymmetry in proton-proton elastic scattering has been performed by Schiavilla et al [22] and very recently by de Vries et al [21].…”

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confidence: 99%

Parity and time-reversal violation in A=2-4 nuclei

Lazauskas

Song

Gudkov

2014

EPJ Web of Conferences

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Abstract. Parity and time-reversal symmetry violating components of the nucleonnucleon interaction play an important role in understanding the main features of the Standard model. These symmetries have been rather intensively studied during the last decade. Moreover, new spallation neutron facilities, such as the SNS at the Oak Ridge National Laboratory and the J-SNS at J-PARC, may provide new data of very high accuracy. In this presentation, we review the current status of the theoretical calculations of parityviolating and time reversal invariance-violating observables in few-nucleon systems. In particular, we concentrate on the low energy nucleon scattering on mass A=1-3 targets, as well as on nuclear EDM calculations for A=2-3 nuclei.

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Hadronic parity violation

Cited by 78 publications

References 70 publications

Parity-Violating Nucleon-Nucleon Force in the1/NcExpansion

Parity-Violating Nucleon-Nucleon Force in the1/NcExpansion

Hadronic Parity Violation in Few-Nucleon Systems

Parity and time-reversal violation in A=2-4 nuclei

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