Search for K- p → π0 π0 π0 Λ from threshold to pk- = 750 MeV/c

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

doi:10.1103/PhysRevC.68.015206

Search for K^- p → π⁰ π⁰ π⁰ Λ from threshold to p_k- = 750 MeV/c

M. Borgh, S. Prakhov, B. M K Nefkens, C. E. Allgower, V. Bekrenev, W. J. Briscoe, M. Clajus, J. R. Comfort, K. Craig, D. Grosnick, D. Isenhower, N. Knecht, D. Koetke, A. Koulbardis, N. Kozlenko, S. Kruglov, G. Lolos, I. Lopatin, D. M. Manley, R. ManweilerA. Marušić, S. McDonald, J. Olmsted, Z. Papandreou, D. Peaslee, N. Phaisangittisakul, J. W. Price, A. F. Ramirez, M. Sadler, A. Shaft, H. Spinka, T. D S Stanislaus, A. Starostin, H. M. Staudenmaier, I. Supek, W. B. Tippens

Physics

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Abstract

The results of a search for K^- p → π⁰ π⁰ π⁰ Λ (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 p_k- = 714 MeV/c, no signal was found; the 90% C.L. upper limit obtained for the K^- p → 3 π⁰ Λ total cross section σ_t varies between 2 and 7 μb. This small upper limit is indicative that spontaneous π⁰ emission is insignificant, since the K^- p → π⁰ π ⁰ π⁰ Λ threshold is at p_k- = 397 MeV/c. A signal was observed only at p_k- = 750 MeV/c, with σ_t = 25±7 μb. These results can be explained only if triple π⁰ production goes predominantly by hyperon resonance deexcitation, K^- p → ∑* → π ⁰Λ*. There are several candidates for the ∑* but only one for the Λ*, namely, the Λ(1520)3-/2, as the threshold for K^- p → π⁰ Λ (1520) is p _k- = 704 MeV/c.

Original language	English (US)
Article number	015206
Pages (from-to)	152061-152066
Number of pages	6
Journal	Physical Review C - Nuclear Physics
Volume	68
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.68.015206
State	Published - Jul 2003

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Nuclear and High Energy Physics

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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., ... Tippens, W. B. (2003). Search for K^- p → π⁰ π⁰ π⁰ Λ from threshold to p_k- = 750 MeV/c. Physical Review C - Nuclear Physics, 68(1), 152061-152066. Article 015206. https://doi.org/10.1103/PhysRevC.68.015206

Borgh, M, Prakhov, S, Nefkens, BMK, Allgower, CE, Bekrenev, V, Briscoe, WJ, Clajus, M, Comfort, JR, Craig, K, Grosnick, D, Isenhower, D, Knecht, N, Koetke, D, Koulbardis, A, Kozlenko, N, Kruglov, S, Lolos, G, Lopatin, I, Manley, DM, Manweiler, R, Marušić, A, McDonald, S, Olmsted, J, Papandreou, Z, Peaslee, D, Phaisangittisakul, N, Price, JW, Ramirez, AF, Sadler, M, Shaft, A, Spinka, H, Stanislaus, TDS, Starostin, A, Staudenmaier, HM, Supek, I & Tippens, WB 2003, 'Search for K^- p → π⁰ π⁰ π⁰ Λ from threshold to p_k- = 750 MeV/c', Physical Review C - Nuclear Physics, vol. 68, no. 1, 015206, pp. 152061-152066. https://doi.org/10.1103/PhysRevC.68.015206

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title = "Search for K- p → π0 π0 π0 Λ from threshold to pk- = 750 MeV/c",

abstract = "The results of a search for K- p → π0 π0 π0 Λ (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 → 3 π0 Λ 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 → π0 π 0 π0 Λ 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 → ∑* → π 0Λ*. There are several candidates for the ∑* but only one for the Λ*, namely, the Λ(1520)3-/2, as the threshold for K- p → π0 Λ (1520) is p k- = 704 MeV/c.",

author = "M. Borgh and S. Prakhov and Nefkens, {B. M K} and Allgower, {C. E.} and V. Bekrenev and Briscoe, {W. J.} and M. Clajus and Comfort, {J. R.} and K. Craig and D. Grosnick and D. Isenhower and N. Knecht and D. Koetke and A. Koulbardis and N. Kozlenko and S. Kruglov and G. Lolos and I. Lopatin and Manley, {D. M.} and R. Manweiler and A. Maru{\v s}i{\'c} and S. McDonald and J. Olmsted and Z. Papandreou and D. Peaslee and N. Phaisangittisakul and Price, {J. W.} and Ramirez, {A. F.} and M. Sadler and A. Shaft and H. Spinka and Stanislaus, {T. D S} and A. Starostin and Staudenmaier, {H. M.} and I. Supek and Tippens, {W. B.}",

year = "2003",

month = jul,

doi = "10.1103/PhysRevC.68.015206",

language = "English (US)",

volume = "68",

pages = "152061--152066",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

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TY - JOUR

T1 - Search for K- p → π0 π0 π0 Λ from threshold to pk- = 750 MeV/c

AU - Borgh, M.

AU - Prakhov, S.

AU - Nefkens, B. M K

AU - Allgower, C. E.

AU - Bekrenev, V.

AU - Briscoe, W. J.

AU - Clajus, M.

AU - Comfort, J. R.

AU - Craig, K.

AU - Grosnick, D.

AU - Isenhower, D.

AU - Knecht, N.

AU - Koetke, D.

AU - Koulbardis, A.

AU - Kozlenko, N.

AU - Kruglov, S.

AU - Lolos, G.

AU - Lopatin, I.

AU - Manley, D. M.

AU - Manweiler, R.

AU - Marušić, A.

AU - McDonald, S.

AU - Olmsted, J.

AU - Papandreou, Z.

AU - Peaslee, D.

AU - Phaisangittisakul, N.

AU - Price, J. W.

AU - Ramirez, A. F.

AU - Sadler, M.

AU - Shaft, A.

AU - Spinka, H.

AU - Stanislaus, T. D S

AU - Starostin, A.

AU - Staudenmaier, H. M.

AU - Supek, I.

AU - Tippens, W. B.

PY - 2003/7

Y1 - 2003/7

N2 - The results of a search for K- p → π0 π0 π0 Λ (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 → 3 π0 Λ 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 → π0 π 0 π0 Λ 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 → ∑* → π 0Λ*. There are several candidates for the ∑* but only one for the Λ*, namely, the Λ(1520)3-/2, as the threshold for K- p → π0 Λ (1520) is p k- = 704 MeV/c.

AB - The results of a search for K- p → π0 π0 π0 Λ (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 → 3 π0 Λ 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 → π0 π 0 π0 Λ 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 → ∑* → π 0Λ*. There are several candidates for the ∑* but only one for the Λ*, namely, the Λ(1520)3-/2, as the threshold for K- p → π0 Λ (1520) is p k- = 704 MeV/c.

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JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

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ER -

Search for K^- p → π⁰ π⁰ π⁰ Λ from threshold to p_k- = 750 MeV/c

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