Fri·Aug 12, 2011Friday·August 12, 2011

1. 01*

   Production of a cascade hyperon in the K^- - proton interaction

   R. Shyam🇮🇳 · O. Scholten🇳🇱 · A.W. Thomas🇦🇺

   We investigate the production of a cascade hyperon (Xi) through the K^- + p --> K^+ (K^0) + Xi^- (Xi^0) reactions, within an effective Lagrangian model where these reactions proceed via excitations of Lambda and Sigma resonance intermediate states in s- and u-channels. The coupling constants at the various vertices are taken from previous studies and SU(3) symmetry considerations. The calculated total cross sections of these reactions, which are in good agreement with the available data, are dominated by the contributions from the Lambda(1520) intermediate resonant state. However, the K^+ meson angular distributions show selectivity to other resonant states in different angular regions and interference among these states leads to their strong backward peaking.

   ↳ hep-phhep-exnucl-exnucl-thPRC(2011)·35 citations
2. 02*

   A new perspective on the ${\Delta }_{5/2^{+}}(2000)$ puzzle

   P. González🇪🇸 · Ju-Jun Xie🇪🇸 · A. Martínez Torres🇯🇵 · E.Oset🇪🇸

   We argue that ${\Delta }_{5/2^{+}}(2000)(\ast \ast ),$ cataloged as a resonance in the Particle Data Book Review (PDG), should be interpreted instead as two distinctive resonances, ${\Delta }_{5/2^{+}}(\sim 1740)$ and ${\Delta }_{5/2^{+}}(\sim 2200)$. Our argument is based on a solution of the $\pi \Delta \rho$ problem in a Fixed Center Approximation (FCA) to the Fadeev equations. ${\Delta }_{5/2^{+}}(\sim 1740)$ can then be interpreted as a $\pi -(\Delta \rho {)}_{N(1675)}$ bound state. As a corollary ${\Delta }_{1/2^{+}}(1750)(\ast )$ can be understood as a $\pi N_{1/2^{-}}(1650)$ bound state.

   ↳ nucl-thhep-exhep-phnucl-ex0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.