2003/11/30 by K. Nakayama, K. Tsushima · 3 citations
Physics and Astronomy · #Asymmetry #High-Energy Particle Collisions Research #Invariant mass #Parity (physics) #Particle physics #Particle physics theoretical and experimental studies #Pentaquark #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1016/j.physletb.2003.12.070
published as Phys.Lett.B583:269-277,2004 · revised version, revtex file, 14 pages, 4 figures, minor revision
arxiv created 2003/12/26 · openalex publication_date 2004/02/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
It is demonstrated that measurements of photon asymmetry in the γn→K−K+n reaction, can most likely determine the parity of the newly discovered Θ+ pentaquark. We predict that if the parity of Θ+ is positive, the photon asymmetry is significantly positive; if the parity is negative, the photon asymmetry is significantly negative. If the background contribution is large, the photon asymmetry may become very small in magnitude, thereby making it difficult to distinguish between the positive and negative parity results. However, even in this case, a combined analysis of the (K+n) invariant mass distribution and photon asymmetry should allow a determination of the parity of Θ+.