TY - JOUR
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.
N1 - Funding Information:
We would like to express our thanks to staffs of KEK PS and beam channel group for their support to provide beam with the excellent condition during the experiment. We also acknowledge to T. Hyodo for the theoretical discussion. One of the authors (K.M.) thanks to the Japan Society for the Promotion of Science (JSPS) for support. The work of J.K. Ahn was supported by a Korea Research Foundation grant (KRF-2003-015-C00130). This work was supported by the Grant-in-Aid for Specially Promoted Research (No. 15001001) from the Ministry of Education, Culture, Science and Technology, Japan.
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 -