Properties of the Λ(1670)½- resonance

D. M. Manley,V. V. Abaev,C. E. Allgower,V. Bekrenev,W. J. Briscoe,M. Clajus,J. R. Comfort,K. Craig,D. Grosnick,D. Isenhower,N. Knecht,D. D. Koetke,A. A. Kulbardis,N. G. Kozlenko,S. Kruglov,G. Lolos,I. V. Lopatin,R. Manweiler,A. Marusic,S. Mcdonald,B. M. K. Nefkens,J. Olmsted,Z. Papandreou,D. C. Peaslee, N. Phaisangittisakul,S. Prakhov,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

Physical Review Letters（2002）

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摘要

Recently the Crystal Ball Collaboration measured precise new data for the near-threshold reaction K - p → ηΛ, which is dominated by formation of the Λ(1670)½ - . In this Letter, we present results of a unitary, multichannel analysis that incorporates the new Crystal Ball data. For our preferred fit, we obtain mass M = 1673 ′ 2 MeV, width r = 23 ′ 6 MeV, and elasticity x = 0.37 ′ 0.07. This elasticity is significantly larger than previously recognized. Resonance parameters of our preferred fit are in striking agreement with the quark-model predictions of Koniuk and Isgur.

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