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

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arxiv nucl-ex/0308005 v3 pith:UJU72UFA submitted 2003-08-06 nucl-ex

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

Precise new data for the reaction $K^- p \to \pi^0 \Lambda$ are presented in the c.m. energy range 1565 to 1600 MeV. Our analysis of these data sheds new light on claims for the $\Sigma(1580){3/2}^-$ 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.

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