Search for K^- P -> Pi^0 Pi^0 Pi^0 Lambda from Threshold to P_K^- = 750 MeV/c (CROSBI ID 101875)
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Podaci o odgovornosti
Borgh, M. ; Prakhov, S. ; Nefkens, B.M.K. ; Allgower, C.E. ; Bekrenev, V. ; Briscoe, W.J. ; Clajus, M. ; Comfort, J.R. ; Craig, K. ; Grosnick, D. ; Isenhower, D. ; Knecht, N. ; Koetke, D. ; Koulbardis, A. ; Kozlenko, N. ; Kruglov, S. ; Lolos, G. ; Lopatin, I. ; Manley, D.M. ; Manweiler, R. ; Marusic, A. ; McDonald, S. ; Olmsted, J. ; Papandreou, Z. ; Peaslee, D. ; Phaisangittisakul, N. ; Price, J.W. ; Ramirez, A.F. ; Sadler, M. ; Shafi, A. ; Spinka, H. ; Stanislaus, T.D.S. ; Starostin, A. ; Staudenmaier, H.M. ; Supek, Ivan ; Tippens, W.B.
engleski
Search for K^- P -> Pi^0 Pi^0 Pi^0 Lambda from Threshold to P_K^- = 750 MeV/c
The results of a search for K^- p->pi^0pi^0pi^0 Lambda(where the 3pi^0's are not from eta-meson decay) are presented. The data were obtained with the Crystal Ball spectrometer at eight beam momenta from 514 to 750 MeV/c. For the six beam momenta below p_K^- = 714 MeV/c, no signal was found the 90% C.L. upper limit obtained for the K^- p->3pi^0 Lambda total cross section sigma_t varies between 2 and 7 µ ; ; b. This small upper limit is indicative that spontaneous pi^0 emission is insignificant, since the K^- p->pi^0pi^0pi^0 Lambda threshold is at p_K^- = 397 MeV/c. A signal was observed only at p_K^- = 750 MeV/c, with sigma_t = 25± ; ; 7 µ ; ; b. These results can be explained only if triple pi^0 production goes predominantly by hyperon resonance deexcitation, K^- p->Sigma*->pi^0Lambda^*. There are several candidates for the Sigma^* but only one for the Lambda^*, namely, the Lambda(1520)3/2^-, as the threshold for K^- p->pi^0 Lambda(1520) is at p_K^- = 704 MeV/c.
crystal ball
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