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 | |
| Publication status | Published - 2006 Apr 6 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=33644895150&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33644895150&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2006.02.048
DO - 10.1016/j.physletb.2006.02.048
M3 - Article
AN - SCOPUS:33644895150
VL - 635
SP - 72
EP - 79
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 2-3
ER -