The role of $Δ^{++*}(1620)$ resonances in $pp \to nK^+Σ^+$ reaction and its important implications

Details The role of $Δ^{++*}(1620)$ resonances in $pp \to nK^+Σ^+$ reaction and its important implications The role of $Δ^{++*}(1620)$ resonances in $pp \to nK^+Σ^+$ reaction and its important implications

2007-01-09

arxiv.org/abs/nucl-th/0701021v1

Phys.Lett.B649:405-412,2007

Physics

Nuclear Physics

Nuclear Theory

11 pages, 3 figures

Scientific paper

10.1016/j.physletb.2007.04.035

The $pp \to nK^+\Sigma^+$ reaction is a very good isospin 3/2 filter for studying $\Delta^{++*}$ decaying to $K^+\Sigma^+$. With an effective Lagrangian approach, contributions from a previous ignored sub-$K^+\Sigma^+$-threshold resonance $\Delta^{++*}(1620)1/2^-$ are fully included in addition to those already considered in previous calculations. It is found that the $\Delta^{++*}(1620)1/2^-$ 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.

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