2004/11/30 by Tetsuo Nishikawa, Yoshiko Kanada-En’yo, Yoshiko Kanada-En'yo +2
Chemistry · Mathematics · Physics and Astronomy · #Algorithm #Chemistry #Crystallography #Hadron #High-Energy Particle Collisions Research #Mathematics #Parity (physics) #Particle physics #Particle physics theoretical and experimental studies #Pentaquark #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #State (computer science) #Sum rule in quantum mechanics #hep-ph
paper · pdf · doi:10.1103/physrevd.71.076004
published as Phys.Rev. D71 (2005) 076004 · 27 pages, 14 figures
arxiv created 2005/02/28 · openalex publication_date 2005/04/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study IJP=0(3)/(2)^\ifmmode±\else\textpm\fi and 1(3)/(2)^\ifmmode±\else\textpm\fi pentaquark states with S=+1 in the QCD sum rule approach. The QCD sum rule for positive parity states and that for negative parity are independently derived. The sum rule suggests that there exist the 0(3)/(2)^\ensuremath- and the 1(3)/(2)^\ensuremath- states. These states may be observed as extremely narrow peaks since they can be much below the S-wave threshold and since the only allowed decay channels are NK in D wave, whose centrifugal barriers are so large that the widths are strongly suppressed. The 0(3)/(2)^\ensuremath- state may be assigned to the observed \ensuremathΘ+(1540) and the 1(3)/(2)^\ensuremath- state can be a candidate for \ensuremathΘ++.