2003/07/31 by Xun Chen, Yajun Mao, Bo-Qiang Ma
Physics and Astronomy · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th #quant-ph
paper · pdf · doi:10.1142/s0217732304014781
published as Mod.Phys.Lett.A19:2289-2298,2004 · 8 latex pages, version for publication, a typo corrected
arxiv created 2004/08/11 · openalex publication_date 2004/09/24 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
The pentaquark state of [Formula: see text] has been observed to decay with two decay modes: Θ + →nK + and Θ + →pK 0 . The decay probability ratio of the two decay modes is studied with general symmetry consideration of isospin, spin and parity. We arrive at a result of the ratio [Formula: see text], which is valid for the Θ + state to be a pure isoscalar or isovector state, or an isoscalar and isovector mixing state, or an isotensor state with mixture of isoscalar and isovector components with coefficients α and β. The dependence on spin and parity of the pentaquark Θ + state is found to be small due to small difference between the center-of-mass decay momenta k 1 and k 2 of the two decay modes. We also provide an analysis on the constraint of the isospin of Θ + from the absence of a peak in the pK + invariant mass distribution in the γp→pK + K - process. Future experimental results about the decay probability ratio may provide information about the properties of the pentaquark Θ + state.