Search for Θ+ via π-p→K-X reaction near production threshold

K. Miwa; J. K. Ahn; K. Aoki; B. H. Choi; Y. Fukao; H. Funahashi; T. Hayakawa; M. Hayata; T. Hibi; M. Ieiri; K. Imai; S. J. Kim; K. Nakazawa; H. Nishikawa; H. Okada; N. Saito; H. D. Sato; K. Shoji; H. Takahashi; K. Taketani; K. Yamamoto; C. J. Yoon

doi:10.1016/j.physletb.2006.02.048

Search for Θ⁺ via π^-p→K^-X reaction near production threshold

K. Miwa, J. K. Ahn, K. Aoki, B. H. Choi, Y. Fukao, H. Funahashi, T. Hayakawa, M. Hayata, T. Hibi, M. Ieiri, K. Imai, S. J. Kim, K. Nakazawa, H. Nishikawa, H. Okada, N. Saito, H. D. Sato, K. Shoji, H. Takahashi, K. TaketaniK. Yamamoto, C. J. Yoon

Research output: Contribution to journal › Article

40 Citations (Scopus)

Abstract

We have searched for Θ⁺ via π^-p→K ^-X reaction using 1.87 and 1.92 GeV/c π^- beam at the K2 beam line of the KEK 12 GeV proton synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/c, a bump has been found at 1530 MeV/c2 which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5-2.7σ. Therefore we have derived the upper limit of Θ⁺ production cross section via π^-p→K^-Θ⁺ reaction which is 3.9 μb at 90% confidence level assuming that Θ⁺ is produced isotropically in the center of mass system.

Original language	English
Pages (from-to)	72-79
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	635
Issue number	2-3
DOIs	https://doi.org/10.1016/j.physletb.2006.02.048
Publication status	Published - 2006 Apr 6
Externally published	Yes

Keywords

Baryons
Glueball and nonstandard multi-quark/gluon states
Hadron-induced low- and intermediate-energy reaction and scattering
Pion-baryon interactions

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Miwa, K., Ahn, J. K., Aoki, K., Choi, B. H., Fukao, Y., Funahashi, H., Hayakawa, T., Hayata, M., Hibi, T., Ieiri, M., Imai, K., Kim, S. J., Nakazawa, K., Nishikawa, H., Okada, H., Saito, N., Sato, H. D., Shoji, K., Takahashi, H., ... Yoon, C. J. (2006). Search for Θ⁺ via π^-p→K^-X reaction near production threshold. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 635(2-3), 72-79. https://doi.org/10.1016/j.physletb.2006.02.048

Search for Θ⁺ via π^-p→K^-X reaction near production threshold. / Miwa, K.; Ahn, J. K.; Aoki, K.; Choi, B. H.; Fukao, Y.; Funahashi, H.; Hayakawa, T.; Hayata, M.; Hibi, T.; Ieiri, M.; Imai, K.; Kim, S. J.; Nakazawa, K.; Nishikawa, H.; Okada, H.; Saito, N.; Sato, H. D.; Shoji, K.; Takahashi, H.; Taketani, K.; Yamamoto, K.; Yoon, C. J.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 635, No. 2-3, 06.04.2006, p. 72-79.

Research output: Contribution to journal › Article

Miwa, K, Ahn, JK, Aoki, K, Choi, BH, Fukao, Y, Funahashi, H, Hayakawa, T, Hayata, M, Hibi, T, Ieiri, M, Imai, K, Kim, SJ, Nakazawa, K, Nishikawa, H, Okada, H, Saito, N, Sato, HD, Shoji, K, Takahashi, H, Taketani, K, Yamamoto, K & Yoon, CJ 2006, 'Search for Θ⁺ via π^-p→K^-X reaction near production threshold', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 635, no. 2-3, pp. 72-79. https://doi.org/10.1016/j.physletb.2006.02.048

Miwa, K. ; Ahn, J. K. ; Aoki, K. ; Choi, B. H. ; Fukao, Y. ; Funahashi, H. ; Hayakawa, T. ; Hayata, M. ; Hibi, T. ; Ieiri, M. ; Imai, K. ; Kim, S. J. ; Nakazawa, K. ; Nishikawa, H. ; Okada, H. ; Saito, N. ; Sato, H. D. ; Shoji, K. ; Takahashi, H. ; Taketani, K. ; Yamamoto, K. ; Yoon, C. J. / Search for Θ⁺ via π^-p→K^-X reaction near production threshold. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2006 ; Vol. 635, No. 2-3. pp. 72-79.

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abstract = "We have searched for Θ+ via π-p→K -X reaction using 1.87 and 1.92 GeV/c π- beam at the K2 beam line of the KEK 12 GeV proton synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/c, a bump has been found at 1530 MeV/c2 which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5-2.7σ. Therefore we have derived the upper limit of Θ+ production cross section via π-p→K-Θ+ reaction which is 3.9 μb at 90% confidence level assuming that Θ+ is produced isotropically in the center of mass system.",

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T1 - Search for Θ+ via π-p→K-X reaction near production threshold

AU - Miwa, K.

AU - Ahn, J. K.

AU - Aoki, K.

AU - Choi, B. H.

AU - Fukao, Y.

AU - Funahashi, H.

AU - Hayakawa, T.

AU - Hayata, M.

AU - Hibi, T.

AU - Ieiri, M.

AU - Imai, K.

AU - Kim, S. J.

AU - Nakazawa, K.

AU - Nishikawa, H.

AU - Okada, H.

AU - Saito, N.

AU - Sato, H. D.

AU - Shoji, K.

AU - Takahashi, H.

AU - Taketani, K.

AU - Yamamoto, K.

AU - Yoon, C. J.

PY - 2006/4/6

Y1 - 2006/4/6

N2 - We have searched for Θ+ via π-p→K -X reaction using 1.87 and 1.92 GeV/c π- beam at the K2 beam line of the KEK 12 GeV proton synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/c, a bump has been found at 1530 MeV/c2 which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5-2.7σ. Therefore we have derived the upper limit of Θ+ production cross section via π-p→K-Θ+ reaction which is 3.9 μb at 90% confidence level assuming that Θ+ is produced isotropically in the center of mass system.

AB - We have searched for Θ+ via π-p→K -X reaction using 1.87 and 1.92 GeV/c π- beam at the K2 beam line of the KEK 12 GeV proton synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/c, a bump has been found at 1530 MeV/c2 which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5-2.7σ. Therefore we have derived the upper limit of Θ+ production cross section via π-p→K-Θ+ reaction which is 3.9 μb at 90% confidence level assuming that Θ+ is produced isotropically in the center of mass system.

KW - Baryons

KW - Glueball and nonstandard multi-quark/gluon states

KW - Hadron-induced low- and intermediate-energy reaction and scattering

KW - Pion-baryon interactions

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