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 journalArticle

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 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

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

Fingerprint Dive into the research topics of 'Search for Θ<sup>+</sup> via π<sup>-</sup>p→K<sup>-</sup>X reaction near production threshold'. Together they form a unique fingerprint.

  • Cite this

    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