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Barnes, C. A.; Lowry, M. M.; Davidson, J. M.; Marrs, R. E.; Morinigo, Fernando B.; Chang, Byong Hoon; Adelberger, E. G.; Swanson, H. E.

doi:10.1103/physrevlett.40.840

Cited by 106 publications

(63 citation statements)

References 15 publications

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“…Thus this system isolates the ∆I = 1 PNC mixing of greatest interest. The results from the four experiments are in good agreement [23][24][25][26] …”

Section: Experimental Summarysupporting

confidence: 70%

“…The Danilov limit, retention of the lowest order contribution corresponding to S↔P amplitudes, corresponds to the first term in the expansion where the identification e −mr 4πr ↔ 1 m 2 δ( r) is made in Eq. (23). [Whether one considers the delta function written above as a true delta function or the representation of a "fuzzy" one, m 2 e −mr /4πr, is really a matter of taste [55], in that PNC will always be treated perturbatively.…”

Section: The Ddh Potential and Its S−p Reductionmentioning

confidence: 99%

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Hadronic parity violation

Haxton

Holstein

2013

Progress in Particle and Nuclear Physics

129

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The history and phenomenology of hadronic parity nonconservation (PNC) is reviewed. We discuss the current status of the experimental tests and theory. We describe a re-analysis of the asymmetry for p+p that, when combined with other experimental constraints and with a recent lattice QCD calculation of the weak pion-nucleon coupling h 1 π , reveals a much more consistent pattern of PNC couplings. In particular, isoscalar coupling strengths are similar to but somewhat larger than the "best value" estimate of Donoghue, Desplanques, and Holstein, while both lattice QCD and experiment indicate a suppressed h 1 π . We discuss the relationship between meson-exchange models of hadronic PNC and formulations based on effective theory, stressing their general compatibility as well as the challenge presented to theory by experiment, as several of the most precise measurements involve significant momentum scales. Future directions are proposed.

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“…Thus this system isolates the ∆I = 1 PNC mixing of greatest interest. The results from the four experiments are in good agreement [23][24][25][26] …”

Section: Experimental Summarysupporting

confidence: 70%

Section: The Ddh Potential and Its S−p Reductionmentioning

confidence: 99%

Hadronic parity violation

Haxton

Holstein

2013

Progress in Particle and Nuclear Physics

129

View full text Add to dashboard Cite

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“…The predicted best value for h 1 π is 4.7 × 10 −7 [29]. The most sensitive experiments designed to search for the ∆I = 1 weak NN channel using the 18 F γ-ray circular polarization [42] did not see any effect. Coupled with theoretical arguments [43] made in the context of the DDH model one infers h 1 π ≤ 1.2 × 10 −7 .…”

Section: Npdgamma Theorymentioning

confidence: 97%

Measurement of parity-violatingγ-ray asymmetry in the capture of polarized cold neutrons on protons

et al. 2011

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The NPDGamma collaboration reports results from the first phase of a measurement of the parity violating up-down asymmetry Aγ with respect to the neutron spin direction of γ-rays emitted in the reaction n + p → d + γ using the capture of polarized cold neutrons on the protons in a liquid parahydrogen target. One expects parity-odd effects in the hadronic weak interaction (HWI) between nucleons to be induced by the weak interaction between quarks. Aγ in n + p → d + γ is dominated by a ∆I = 1, 3 S1 − 3 P1 parity-odd transition amplitude in the n-p system. The first phase of the measurement was completed at the Los Alamos Neutron Science Center spallation source (LANSCE) with the result Aγ = (−1.2 ± 2.1 stat. ± 0.2 sys.) × 10 −7 . We also report the first measurement of an upper limit for the parity allowed left right asymmetry in this reaction, with the result Aγ,LR = (−1.8 ± 1.9 stat. ± 0.2 sys.) × 10 −7 . In this paper we give a detailed report on the theoretical background, experimental setup, measurements, extraction of the parity-odd and parity-allowed asymmetries, analysis of potential systematic effects, and the LANSCE results. The asymmetry has an estimated size of 5 × 10 −8 and the aim of the NPDGamma collaboration is to measure it to 1 × 10 −8 . The second phase of the measurement will be performed at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory.

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“…ray could be smaller than 10~5, many possible sources of even tiny instrumental asymmetries must be considered. 3 "" 5 Among the instrumental effects, those correlated with the magnetization sense, such as synchronous beam bending, are expected to introduce spurious asymmetries in the results. From magnetic field measurements the synchronous displacement of the beam spot was estimated to be less than 2 //,m.…”

mentioning

confidence: 98%

Search for the Circular Polarization of the 1081-keV Gamma Ray inF18

et al. 1985

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A new measurement of the circular polarization P y of the 1081-keV y line in 18 F has been performed. The result is ^(1081 keV) = (2.7 ± 5.7) x 10" 4 . This result, when averaged with those of recent measurements in 18 F, sets an upper constraint for the absolute value of the coupling constant/" of the weak TTNN interaction of |/J ^ 1.5 x 10~7.PACS numbers: 23.20.Lv, ll.30.Er, 21.30. + y, 27.20. + n Parity nonconservation in nuclei is understood as a consequence of the weak interaction among hadrons. In the low-energy limit one expects that nuclear parity-nonconservation effects can be estimated from a parity-nonconserving potential F pnc , to which there mainly contribute terms associated with the exchange of one virtual meson. 1 Among these the one arising from the exchange of one charged pion plays a peculiar role. In fact this term, which connects states with A T = 1, determines the long-range behavior of V pnc and is almost independent of the short-range part of the two-nucleon density matrix. Moreover, the value of the weak TTNN coupling constant f v comes out to be intimately related to the structure of the hadronic neutral weak currents and to the value of the quark masses.The measurement of the circular polarization P y of the 1081-keV y ray deexciting the first J n = 0~, T = 0 state in 18 F was recognized 2 as one of the most direct ways to determine the value of f^. This circular polarization is induced by the parity mixing of the state at 1081 keV with the one at 1042 keV (/^ = 0 + , r= 1).

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Search for Neutral-Weak-Current Effects in the NucleusF18

Cited by 106 publications

References 15 publications

Hadronic parity violation

Hadronic parity violation

Measurement of parity-violatingγ-ray asymmetry in the capture of polarized cold neutrons on protons

Search for the Circular Polarization of the 1081-keV Gamma Ray inF18

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