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Title: Joint description of weak radiative and nonleptonic hyperon decays in broken SU(3)

Abstract

We give a joint description of weak radiative (WR) and nonleptonic (NL) hyperon decays (HD) in broken SU(3). The two groups of decays are linked via SU(2){sub W} spin symmetry and vector-meson dominance (VMD). We use experimental information on the parity-conserving NLHD amplitudes to fix the corresponding WRHD amplitudes. With the latter known, the data on the WRHD branching ratios and asymmetries permit us to determine the parity-violating WRHD amplitudes in terms of two parameters corresponding to the two-quark and single-quark transitions. We obtain a good description of the data, and, in particular, a large {sigma}{sup +}{yields}p{gamma} asymmetry. Then, using the SU(2){sub W}+VMD route we determine the non-soft-meson correction term in the parity-violating NLHD amplitudes. The latter is shown to subtract a substantial amount from the current-algebra commutator thus leading towards the resolution of the S ratio P discrepancy in NLHD.

Authors:
 [1]
  1. Dept. of Theoretical Physics, Institute of Nuclear Physics, Polish Academy of Sciences Radzikowskiego 152, 31-342 Cracow (Poland)
Publication Date:
OSTI Identifier:
20782851
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.73.076005; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ASYMMETRY; BRANCHING RATIO; COMMUTATORS; CORRECTIONS; CURRENT ALGEBRA; PARITY; PARTICLE DECAY; QUARKS; SIGMA PLUS PARTICLES; SPIN; SU-2 GROUPS; SU-3 GROUPS; SYMMETRY; VECTOR DOMINANCE MODEL; VECTOR MESONS

Citation Formats

Zenczykowski, P. Joint description of weak radiative and nonleptonic hyperon decays in broken SU(3). United States: N. p., 2006. Web. doi:10.1103/PHYSREVD.73.076005.
Zenczykowski, P. Joint description of weak radiative and nonleptonic hyperon decays in broken SU(3). United States. doi:10.1103/PHYSREVD.73.076005.
Zenczykowski, P. Sat . "Joint description of weak radiative and nonleptonic hyperon decays in broken SU(3)". United States. doi:10.1103/PHYSREVD.73.076005.
@article{osti_20782851,
title = {Joint description of weak radiative and nonleptonic hyperon decays in broken SU(3)},
author = {Zenczykowski, P.},
abstractNote = {We give a joint description of weak radiative (WR) and nonleptonic (NL) hyperon decays (HD) in broken SU(3). The two groups of decays are linked via SU(2){sub W} spin symmetry and vector-meson dominance (VMD). We use experimental information on the parity-conserving NLHD amplitudes to fix the corresponding WRHD amplitudes. With the latter known, the data on the WRHD branching ratios and asymmetries permit us to determine the parity-violating WRHD amplitudes in terms of two parameters corresponding to the two-quark and single-quark transitions. We obtain a good description of the data, and, in particular, a large {sigma}{sup +}{yields}p{gamma} asymmetry. Then, using the SU(2){sub W}+VMD route we determine the non-soft-meson correction term in the parity-violating NLHD amplitudes. The latter is shown to subtract a substantial amount from the current-algebra commutator thus leading towards the resolution of the S ratio P discrepancy in NLHD.},
doi = {10.1103/PHYSREVD.73.076005},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 73,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}