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Title: Parity nonconservation in elastic p-vectorp scattering

Abstract

By looking at the parity-nonconserving (PNC) asymmetries for different energies in p-vectorp scattering, it is in principle possible to determine the PNC {rho}NN and {omega}NN couplings of a single-meson-exchange model of the PNC NN force. Analysis of the experimental data at 13.6, 45, and 221 MeV was performed by Carlson et al., [Phys. Rev. C 65, 035502 (2002)] who concluded the data were in agreement with the uncertainties accorded the original DDH estimates for the PNC meson-nucleon couplings. In this work it is shown first that a comparison with updated hadronic predictions of these couplings suggests the existence of some discrepancy for the PNC {omega}NN coupling. The effect of varying the strong coupling constants and introducing cutoffs in the one-boson-exchange weak potential is then investigated. As expected, the resulting asymmetry is quite sensitive to these parameters regardless of the energy. However, the above mentioned discrepancy persists. The dependence of this conclusion on various ingredients entering an improved description of the PNC NN force is also examined. Additional mechanisms include the two-pion resonance nature of the rho meson and some momentum dependence of the isoscalar PNC {rho}NN vertex. None of these corrections removes or even alleviates the above discrepancy. Their impactmore » on the theoretical determination of the vector meson-nucleon couplings, the description of the PNC force in terms of single-meson exchange, and the interpretation of measurements are examined.« less

Authors:
 [1];  [2];  [3]
  1. KVI, Zernikelaan 25, Groningen 9747 AA (Netherlands)
  2. Department of Physics, Seoul National University, Seoul, 151-742 (Korea, Republic of)
  3. Laboratoire de Physique Subatomique et de Cosmologie (UMR CNRS/IN2P3-UJF-INPG), F-38026 Grenoble Cedex (France)
Publication Date:
OSTI Identifier:
20771607
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 73; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.73.065501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BOSON-EXCHANGE MODELS; COMPARATIVE EVALUATIONS; CORRECTIONS; COUPLING; COUPLING CONSTANTS; MEV RANGE; OMEGA-782 MESONS; P INVARIANCE; PARITY; PIONS; POLARIZED BEAMS; POTENTIALS; PROTON BEAMS; PROTON-PROTON INTERACTIONS; PROTONS; RESONANCE PARTICLES; RHO-770 MESONS; SCATTERING

Citation Formats

Liu, C -P, Hyun, C H, Institute of Basic Science, Sungkyunkwan University, Suwon 440-746, and Desplanques, B. Parity nonconservation in elastic p-vectorp scattering. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.065501.
Liu, C -P, Hyun, C H, Institute of Basic Science, Sungkyunkwan University, Suwon 440-746, & Desplanques, B. Parity nonconservation in elastic p-vectorp scattering. United States. doi:10.1103/PhysRevC.73.065501.
Liu, C -P, Hyun, C H, Institute of Basic Science, Sungkyunkwan University, Suwon 440-746, and Desplanques, B. Thu . "Parity nonconservation in elastic p-vectorp scattering". United States. doi:10.1103/PhysRevC.73.065501.
@article{osti_20771607,
title = {Parity nonconservation in elastic p-vectorp scattering},
author = {Liu, C -P and Hyun, C H and Institute of Basic Science, Sungkyunkwan University, Suwon 440-746 and Desplanques, B},
abstractNote = {By looking at the parity-nonconserving (PNC) asymmetries for different energies in p-vectorp scattering, it is in principle possible to determine the PNC {rho}NN and {omega}NN couplings of a single-meson-exchange model of the PNC NN force. Analysis of the experimental data at 13.6, 45, and 221 MeV was performed by Carlson et al., [Phys. Rev. C 65, 035502 (2002)] who concluded the data were in agreement with the uncertainties accorded the original DDH estimates for the PNC meson-nucleon couplings. In this work it is shown first that a comparison with updated hadronic predictions of these couplings suggests the existence of some discrepancy for the PNC {omega}NN coupling. The effect of varying the strong coupling constants and introducing cutoffs in the one-boson-exchange weak potential is then investigated. As expected, the resulting asymmetry is quite sensitive to these parameters regardless of the energy. However, the above mentioned discrepancy persists. The dependence of this conclusion on various ingredients entering an improved description of the PNC NN force is also examined. Additional mechanisms include the two-pion resonance nature of the rho meson and some momentum dependence of the isoscalar PNC {rho}NN vertex. None of these corrections removes or even alleviates the above discrepancy. Their impact on the theoretical determination of the vector meson-nucleon couplings, the description of the PNC force in terms of single-meson exchange, and the interpretation of measurements are examined.},
doi = {10.1103/PhysRevC.73.065501},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 73,
place = {United States},
year = {2006},
month = {6}
}