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 › peer-review

42 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

Access to Document

10.1016/j.physletb.2006.02.048

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

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

@article{9b4060af90884aebad1403d9abe2540e,

title = "Search for Θ+ via π-p→K-X reaction near production threshold",

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.",

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

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

note = "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.",

year = "2006",

month = apr,

day = "6",

doi = "10.1016/j.physletb.2006.02.048",

language = "English",

volume = "635",

pages = "72--79",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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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

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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 -