ANL-Osaka DCC Analysis for Antikaon (K) Induced Reactions off the nucleon

This web page presents the partial-wave amplitudes (PWAs) of meson-baryon reactions in the strangeness S = -1 sector determined from the Argonne National Laboratory-Osaka University (ANL-Osaka) dynamical coupled-channel analysis of the data of antikaon-nucleon reactions in the invariant mass W ≤ 2.1 GeV region.

Channels included in the model are KN, πΣ, πΛ, ηΛ, KΞ, ππΛ (πΣ*), πKN (K*N). About 17,200 data points are included in the fits with about 290 model parameters which define phenomenologically the meson-exchange interactions between the considered meson-baryon channels and the quark-gluon excitations of the hyperons to about 20 excited states.

References

Formulation of the model, quality of the numerical fits to the data, and graphical representation of the determined PWAs have been reported in [1]. Various parameters (complex pole positions, residues, and branching ratios etc.) associated with hyperon resonances extracted from the determined PWAs have been reoprted in [2].

[1] H. Kamano, S.X. Nakamura, T.-S. H. Lee, T. Sato, Phys. Rev. C 90, 065204 (2014) [2] H. Kamano, S.X. Nakamura, T.-S. H. Kee, T. Sato, Phys. Rev. C 92, 025205 (2015) [Erratum: ibid. 95, 049903 (2017)]

PWA

Numerical valures of the determined PWAs for each KN reaction are available via the links in the table below. In the analysis of [1], two solutions for the PWAs were obtained and the resulting solutions are assigined as Model A and Model B, respectively.

Note: the PWA (T) is unitless and is related to the S-matrix by S = 1 + 2 i T in each partial-wave. ("T" here corresponds to "F" in [1].)

The PWAs for each reaction are given at scattering energies (W) from near the threshold up to 2.1 GeV for every 10MeV, while the PWAs in W=1500-1530MeV and W=1660-1684MeV are given for every 2MeV.