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Phys. Rev. C 68, 015206 (2003) [6 pages]

Search for K-p→π0π0π0Λ from threshold to pK-=750 MeV/c

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M. Borgh et al. (Crystal Ball Collaboration)
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Received 26 February 2003; published 30 July 2003

The results of a search for K-p→π0π0π0Λ (where the 3π0’s are not from η-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 pK-=714 MeV/c, no signal was found; the 90% C.L. upper limit obtained for the K-p→3π0Λ total cross section σt varies between 2 and 7 μb. This small upper limit is indicative that spontaneous π0 emission is insignificant, since the K-p→π0π0π0Λ threshold is at pK-=397 MeV/c. A signal was observed only at pK-=750 MeV/c, with σt=25±7 μb. These results can be explained only if triple π0 production goes predominantly by hyperon resonance deexcitation, K-p→Σ*→π0Λ*. There are several candidates for the Σ* but only one for the Λ*, namely, the Λ(1520)3 / 2-, as the threshold for K-p→π0Λ(1520) is at pK-=704 MeV/c.


©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRC/v68/e015206
DOI: 10.1103/PhysRevC.68.015206
PACS: 14.20.Jn, 13.75.Jz, 13.30.Eg

* Present address: Dept. of Mathematical Physics, Lund Institute of Technology, Sölvegatan 14A, SE-221 00 Lund, Sweden.
† Present address: Indiana University Cyclotron Facility, 2401 Milo B. Sampson Ln., Bloomington, IN 47405.
‡ Present address: Collider-Accelerator Dept., Brookhaven National Laboratory, Upton, NY 11973.
§ Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., Canada V6T 2A3.
** Present address: Nuclear Physics Div., Dept. of Energy, 19901 Germantown Road, Germantown, MD 20874-1290.

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