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

K. Miwa, Jung Keun 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 journalArticle

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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.

Original languageEnglish
Pages (from-to)72-79
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume635
Issue number2-3
DOIs
Publication statusPublished - 2006 Apr 6
Externally publishedYes

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thresholds
mass spectra
center of mass
confidence
synchrotrons
momentum
protons
cross sections

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

Cite this

Search for Θ+ via π-p→K-X reaction near production threshold. / Miwa, K.; Ahn, Jung Keun; 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 journalArticle

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

AU - Miwa, K.

AU - Ahn, Jung Keun

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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