Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-11-10
Nucl.Phys.A867:41-51,2011
Physics
Nuclear Physics
Nuclear Theory
Polarization data from the Crystal Ball Collaboration are included for the fit
Scientific paper
10.1016/j.nuclphysa.2011.07.008
The Crystal Ball Collaboration has recently reported the differential cross sections and $\Lambda$ polarization for the reaction $K^-p\rightarrow \pi^0\Lambda$ using an incident $K^-$ beam with momenta between 514 and 750 MeV/$c$. We make a partial wave analysis for this process with an effective Lagrangian approach and study the properties of some $\Sigma$ resonances around this energy range. With the inclusion of the 4-star resonances $\Sigma(1189)$, $\Sigma^*(1385)$, $\Sigma(1670){3\over 2}^-$, $\Sigma(1775){5\over 2}^-$, as well as a $\Sigma(1635){1\over 2}^+$, which is compatible with the 3-star $\Sigma(1660){1\over 2}^+$ in PDG, our results can well reproduce the experimental data. The parameters on the $\Sigma$ resonances and related couplings are studied.
Gao Puze
Sibirtsev Alexander
Zou Bing-Song
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