Does the Sigma(1580)3/2- resonance exist?

Crystal Ball Collaboration; Olmsted, J.; Prakhov, S.; Manley, D. M.; Allgower, C. E.; Bekrenev, V. S.; Briscoe, W. J.; Clajus, M.; Comfort, J. R.; Craig, K.; Grosnick, D.; Isenhower, D.; Knecht, N.; Koetke, D. D.; Kozlenko, N. G.; Kruglov, S.; Kulbardis, A. A.; Lolos, G.; Lopatin, I. V.; Manweiler, R.; Marusic, A.; McDonald, S.; Nefkens, B. M. K.; Papandreou, Z.; Peaslee, D. C.; Phaisangittisakul, N.; Price, J. W.; Ramirez, A. F.; Sadler, M.; Shafi, A.; Spinka, H.; Stanislaus, T. D. S.; Starostin, A.; Staudenmaier, H. M.; Strakovsky, I. I.; Supek, I.; Tippens, W. B.

Does the Sigma(1580)3/2- resonance exist?

Authors

Crystal Ball Collaboration

Description

Precise new data for the reaction $K^- p \to π^0 Λ$ are presented in the c.m. energy range 1565 to 1600 MeV. Our analysis of these data sheds new light on claims for the $Σ(1580){3/2}^-$ resonance, which (if it exists with the specified quantum numbers) must be an exotic baryon because of its very low mass. Our results show no evidence for this state.
4 pages, 4 figures