Measurement of Parity Nonconservation in the Proton-Proton Total Cross Section at 800 MeV

Yuan, V. W.; Frauenfelder, Hans; Harper, R. W.; Bowman, J. D.; Carlini, R.; MacArthur, D.W.; Mischke, R. E.; Nagle, D. E.; Talaga, R. L.; McDonald, A.B.

doi:10.1103/physrevlett.57.1680

Cited by 65 publications

(34 citation statements)

References 24 publications

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“…There are two measurements at 15 MeV [6] and 45 MeV [7], which yielded asymmetry values of (−1.7 ± 0.8) × 10 −7 and (−2.3 ± 0.9) × 10 −7 , respectively, as well as more precise measurements at 13.6 MeV [8], 45 MeV [9], and 221 MeV [1] yielding (−0.95 ± 0.15) × 10 −7 , (−1.50 ± 0.23) × 10 −7 , and (+0.84 ± 0.29) × 10 −7 , respectively, and finally a measurement at 800 MeV in Ref. [10], which produced an asymmetry value of (+2.4 ± 1.1) × 10 −7 . The theoretical (and, in fact, experimental) investigation of PV effects induced by the weak interaction in the pp system began with the prediction by Simonius [11] that the longitudinal asymmetry would have a broad maximum at energies close to 50 MeV, and that, being dominated by the J=0 partial waves, it would be essentially independent of the scattering angle.…”

Section: Introductionmentioning

confidence: 99%

Parity-violating interaction effects: The longitudinal asymmetry inppelastic scattering

et al. 2002

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The proton-proton parity-violating longitudinal asymmetry is calculated in the lab-energy range 0-350 MeV, using a number of different, latest-generation strong-interaction potentials-Argonne v 18 , Bonn-2000, and Nijmegen-I-in combination with a weak-interaction potential consisting of ρ-and ω-meson exchanges-the model known as DDH. The complete scattering problem in the presence of parity-conserving, including Coulomb, and parity-violating potentials is solved in both configuration-and momentum-space. The predicted parity-violating asymmetries are found to be only weakly dependent upon the input strong-interaction potential adopted in the calculation. Values for the ρ-and ω-meson weak coupling constants h pp ρ and h pp ω are determined by reproducing the measured asymmetries at 13.6 MeV, 45 MeV, and 221 MeV. 21.30.+y, 25.40.Cm

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Section: Introductionmentioning

confidence: 99%

Parity-violating interaction effects: The longitudinal asymmetry inppelastic scattering

et al. 2002

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“…One notices the increase in importance of the second parity violating transition amplitude for energies above 100 MeV. There exists a further p-p parity violation measurement at 800 MeV with A z = (2.4 ± 1.1) × 10 −7 [14]. Interpretation of the latter result in terms of the effective ρ and ω weak meson-nucleon coupling constants is more difficult due to the presence of a large inelasticity (pion production).…”

Section: ×10mentioning

confidence: 98%

Parity Violation in Proton-Proton Scattering

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Oers

2001

Nuclear Physics News

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Measurements of parity-violating longitudinal analyzing powers (normalized asymmetries) in polarized proton-proton scattering provide a unique window on the interplay between the weak and strong interactions between and within hadrons. Several new proton-proton parity violation experiments are presently either being performed or are being prepared for execution in the near future: at TRIUMF at 221 MeV and 450 MeV and at COSY (Kernforschungsanlage Jülich) at 230 MeV and near 1.3 GeV. These experiments are intended to provide stringent constraints on the set of six effective weak mesonnucleon coupling constants, which characterize the weak interaction between hadrons in the energy domain where meson exchange models provide an appropriate description. The 221 MeV is unique in that it selects a single transition amplitude ( 3 P 2 -1 D 2 ) and consequently constrains the weak meson-nucleon coupling constant h pp ρ . The TRIUMF 221 MeV proton-proton parity violation experiment is described in some detail. A preliminary result for the longitudinal analyzing power is A z = (1.1 ± 0.4 ± 0.4) × 10 −7 . Further proton-proton parity violation experiments are commented on. The anomaly at 6 GeV/c requires that a new multi-GeV proton-proton parity violation experiment be performed.One of the more promising ways to study the neutral weak current interaction in hadronic systems is through measurements of parity violation in nucleon-nucleon (N-N)

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“…4 may be considered fairly model independent. Contributions of the five lowest parity mixed partial wave amplitudes ( MeV [29], PSI at 45 MeV [5], TRIUMF at 221.3 MeV [8], and Los Alamos at 800 MeV [7].…”

Section: A Basic Interactionsmentioning

confidence: 99%

“…Presently PNC np scattering experiments are unlikely and even pp scattering experiments are scarce [5,6,7,8]. Among these of particular interest is the measurement of the parity violating spin observableĀ L in the TRIUMF experiment E497 at 221.3 MeV [8].…”

Section: Introductionmentioning

confidence: 99%

Parity nonconserving two-pion exchange in elastic proton-proton scattering

2008

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Parity nonconserving two-pion exchange in elastic pp scattering is investigated in the presence of phenomenological strong distortions in various models. Parity violation is included in N N π vertex considering N N and N ∆(1232) intermediate states in box and crossed box diagrams. Using the derived parity nonconserving two-pion exchange potential we calculate the longitudinal analyzing powerĀ L in elastic pp scattering. The predicted effect is of the same order as vector meson exchanges.

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Measurement of Parity Nonconservation in the Proton-Proton Total Cross Section at 800 MeV

Cited by 65 publications

References 24 publications

Parity-violating interaction effects: The longitudinal asymmetry inppelastic scattering

Parity-violating interaction effects: The longitudinal asymmetry inppelastic scattering

Parity Violation in Proton-Proton Scattering

Parity nonconserving two-pion exchange in elastic proton-proton scattering

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