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Title: Paschos-Wolfenstein relation in a hadronic picture

Abstract

The Paschos-Wolfenstein (PW) relation joins neutral- and charged-current neutrino- and antineutrino-induced cross sections into an expression that depends on the weak mixing angle sin{sup 2}{theta}{sub W}. Contrary to the traditional approach with partonic degrees of freedom, we adopt a model built on hadronic degrees of freedom to perform a study of the PW relation at intermediate neutrino energies (100 MeV to 2 GeV). Running and upcoming high-statistics scattering experiments such as MiniBooNE, MINER{nu}A, FINeSSE and beta-beam experiments make a scrutiny of the PW relation timely. Employing a relativistic Glauber nucleon knockout model for the description of quasielastic neutrino-nucleus reactions, the influence of nuclear effects on the PW relation is investigated. We discuss nuclear model dependences and show that the PW relation is a robust ratio, mitigating the effect of final-state interactions, for example, to the 1% level. The role played by a possible strangeness content of the nucleon is investigated. It appears that the uncertainties arising from the poorly known strangeness parameters and the difficulties in nuclear modeling seriously limit the applicability of the PW relation as an intermediate-energy electroweak precision tool. On the other hand, we show that nuclear effects may be sufficiently well under control to allow themore » extraction of new information on the axial strangeness parameter. Results are presented for {sup 16}O and {sup 56}Fe.« less

Authors:
; ; ; ;  [1]
  1. Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent (Belgium)
Publication Date:
OSTI Identifier:
20864240
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 74; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.74.065501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANTINEUTRINOS; CHARGED CURRENTS; CROSS SECTIONS; DEGREES OF FREEDOM; FINAL-STATE INTERACTIONS; GEV RANGE; IRON 56; KNOCK-OUT REACTIONS; MEV RANGE; NEUTRINO-NUCLEON INTERACTIONS; NUCLEAR MODELS; NUCLEONS; OXYGEN 16; RELATIVISTIC RANGE; SCATTERING; STATISTICS; STRANGENESS; WEINBERG ANGLE

Citation Formats

Praet, C., Jachowicz, N., Ryckebusch, J., Vancraeyveld, P., and Vantournhout, K. Paschos-Wolfenstein relation in a hadronic picture. United States: N. p., 2006. Web. doi:10.1103/PHYSREVC.74.065501.
Praet, C., Jachowicz, N., Ryckebusch, J., Vancraeyveld, P., & Vantournhout, K. Paschos-Wolfenstein relation in a hadronic picture. United States. doi:10.1103/PHYSREVC.74.065501.
Praet, C., Jachowicz, N., Ryckebusch, J., Vancraeyveld, P., and Vantournhout, K. Fri . "Paschos-Wolfenstein relation in a hadronic picture". United States. doi:10.1103/PHYSREVC.74.065501.
@article{osti_20864240,
title = {Paschos-Wolfenstein relation in a hadronic picture},
author = {Praet, C. and Jachowicz, N. and Ryckebusch, J. and Vancraeyveld, P. and Vantournhout, K.},
abstractNote = {The Paschos-Wolfenstein (PW) relation joins neutral- and charged-current neutrino- and antineutrino-induced cross sections into an expression that depends on the weak mixing angle sin{sup 2}{theta}{sub W}. Contrary to the traditional approach with partonic degrees of freedom, we adopt a model built on hadronic degrees of freedom to perform a study of the PW relation at intermediate neutrino energies (100 MeV to 2 GeV). Running and upcoming high-statistics scattering experiments such as MiniBooNE, MINER{nu}A, FINeSSE and beta-beam experiments make a scrutiny of the PW relation timely. Employing a relativistic Glauber nucleon knockout model for the description of quasielastic neutrino-nucleus reactions, the influence of nuclear effects on the PW relation is investigated. We discuss nuclear model dependences and show that the PW relation is a robust ratio, mitigating the effect of final-state interactions, for example, to the 1% level. The role played by a possible strangeness content of the nucleon is investigated. It appears that the uncertainties arising from the poorly known strangeness parameters and the difficulties in nuclear modeling seriously limit the applicability of the PW relation as an intermediate-energy electroweak precision tool. On the other hand, we show that nuclear effects may be sufficiently well under control to allow the extraction of new information on the axial strangeness parameter. Results are presented for {sup 16}O and {sup 56}Fe.},
doi = {10.1103/PHYSREVC.74.065501},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 74,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}
  • The modification of the Paschos-Wolfenstein relation is investigated when the charge symmetry violations of valence and sea quark distributions in the nucleon are taken into account. We also study qualitatively the impact of charge symmetry violation (CSV) effect on the extraction of sin{sup 2}{theta}{sub w} from deep-inelastic neutrino- and antineutrino-nuclei scattering within the light-cone meson-baryon fluctuation model. We find that the effect of CSV is too small to give a sizable contribution to the NuTeV result with various choices of mass difference inputs, which is consistence with the prediction that the strange-antistrange asymmetry can account for largely the NuTeV deviationmore » in this model. It is noticeable that the effect of CSV might contribute to the NuTeV deviation when the larger difference between the internal momentum scales, {alpha}{sub p} of the proton and {alpha}{sub n} of the neutron, is considered.« less
  • The {Lambda}{sub c}(2940){sup +} baryon with possible quantum numbers J{sup P}=(1/2){sup +} and (1/2){sup -} is studied as a molecular state composed of a nucleon and D* meson. We give predictions for the strong two-body decay channels {Lambda}{sub c}(2940){sup +{yields}}pD{sup 0}, {Sigma}{sub c}{sup ++{pi}-} and {Sigma}{sub c}{sup 0{pi}+}, where the sum of partial widths is consistent with current data for the case of J{sup P}=(1/2){sup +}. The case of J{sup P}=(1/2){sup -} is shown to be ruled out.
  • The {Lambda}{sub c}(2940){sup +} baryon with quantum numbers J{sup P}=(1/2){sup +} is considered as a molecular state composed of a nucleon and D{sup *} meson. We give predictions for the width of the radiative decay process {Lambda}{sub c}(2940){sup +}{yields}{Lambda}{sub c}(2286){sup +}+{gamma} in this interpretation. Based on our results we argue that an experimental determination of the radiative decay width of {Lambda}{sub c}(2940){sup +} is important for the understanding of its intrinsic properties.
  • The {Lambda}{sub c}(2940){sup +} baryon with quantum numbers J{sup P}=(1/2){sup +} is considered as a hadronic molecule composed of a nucleon and D{sup *} meson. We give predictions for the width of the strong three-body decay processes {Lambda}{sub c}(2940){sup +}{yields}{Lambda}{sub c}(2286){sup +}{pi}{sup +}{pi}{sup -} and {Lambda}{sub c}(2286){sup +}{pi}{sup 0}{pi}{sup 0} in this interpretation. Upcoming experimental facilities like a Super B factory at KEK or LHCb might be able to provide data on these decay modes.