2006/07/26 by A. I. Titov, B. Kämpfer, S. Daté +2
Chemistry · Mathematics · Physics and Astronomy · #Chemistry #Combinatorics #Crystallography #High-Energy Particle Collisions Research #Lambda #Mathematics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #nucl-th
paper · pdf · doi:10.1103/physrevc.74.055206
published as Phys.Rev.C74:055206,2006 · 40 pageg, 26 figures
arxiv created 2006/07/26 · openalex publication_date 2006/11/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We analyze the possibility of producing an intermediate \ensuremathΘ+ via a KN\ensuremath→\ensuremathΘ+ formation process in \ensuremathγD\ensuremath→pK^\ensuremath-X(X=nK+,pK0) reactions at some specific kinematical conditions, in which a pK^\ensuremath- pair is knocked out in the forward direction and its invariant mass is close to the mass of \ensuremathΛ*[\ensuremathΛ*\ensuremath≡\ensuremathΛ(1520)]. The \ensuremathΘ+ signal may appear in the [\ensuremathγD,pK^\ensuremath-] missing mass distribution. The ratio of the signal (cross section at the \ensuremathΘ+ peak position) to the smooth background processes varies from 0.7 to 2.5 depending on the spin and parity of \ensuremathΘ+, and it decreases correspondingly if the pK^\ensuremath- invariant mass is outside of the \ensuremathΛ*-resonance region. We analyze the recent CLAS search for the \ensuremathΘ+ in the \ensuremathγD\ensuremath→pK^\ensuremath-nK+ reaction and show that the conditions of this experiment greatly reduce the \ensuremathΘ+ formation process making it difficult to extract a \ensuremathΘ+ peak from the data.