The role of ${\Delta }^{++\ast }(1620)$ resonances in $pp\to n{K}^{+}{\Sigma }^{+}$ reaction and its important implications

Abstract

The $pp\to n{K}^{+}{\Sigma }^{+}$ reaction is a very good isospin 3/2 filter for studying ${\Delta }^{++\ast }$ decaying to $K^{+}{\Sigma }^{+}$. With an effective Lagrangian approach, contributions from a previous ignored sub-$K^{+}{\Sigma }^{+}$-threshold resonance ${\Delta }^{++\ast }(1620)1/2^{-}$ are fully included in addition to those already considered in previous calculations. It is found that the ${\Delta }^{++\ast }(1620)1/2^{-}$ resonance gives an overwhelmingly dominant contribution for energies very close to threshold, with a very important contribution from the t-channel $\rho$ exchange. This solves the problem that all previous calculations seriously underestimate the near-threshold cross section by order(s) of magnitude. Many important implications of the results are discussed.

11 pages, 3 figures

References in corpus (1)

• Reply to Comment on "Mass and K-Lambda Coupling of the N*(1535)"

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