Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs

T. Nakano; N. Muramatsu; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; W. C. Chang; S. Daté; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; H. Hasegawa; K. Hicks; K. Horie; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsuda; N. Matsuoka; T. Matsumura; T. Mibe; M. Miyabe; Y. Miyachi; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; P. M. Shagin; Y. Shiino; A. Shimizu; H. Shimizu; Y. Sugaya; M. Sumihama; Y. Toi; H. Toyokawa; A. Wakai; C. W. Wang; S. C. Wang; K. Yonehara; T. Yorita; M. Yoshimura; M. Yosoi; R. G.T. Zegers

doi:10.1103/PhysRevC.79.025210

Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs

T. Nakano^*, N. Muramatsu, D. S. Ahn, J. K. Ahn, H. Akimune, Y. Asano, W. C. Chang, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, S. Fukui, H. Hasegawa, K. Hicks, K. Horie, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, Y. KatoH. Kawai, Z. Y. Kim, K. Kino, H. Kohri, N. Kumagai, S. Makino, T. Matsuda, N. Matsuoka, T. Matsumura, T. Mibe, M. Miyabe, Y. Miyachi, M. Niiyama, M. Nomachi, Y. Ohashi, H. Ohkuma, T. Ooba, D. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, P. M. Shagin, Y. Shiino, A. Shimizu, H. Shimizu, Y. Sugaya, M. Sumihama, Y. Toi, H. Toyokawa, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yoshimura, M. Yosoi, R. G.T. Zegers

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

137 Citations (Scopus)

Abstract

The γd→K+K-pn reaction has been studied to search for the evidence of the Θ+ by detecting K+K- pairs at forward angles. The Fermi-motion-corrected nK+ invariant mass distribution shows a narrow peak at 1.524±0.002+0.003 GeV/c2. The statistical significance of the peak calculated from a shape analysis is 5.1 σ, and the differential cross section for the γn→K-Θ+ reaction is estimated to be 12±2 nb/sr in the photon energy range from 2.0 to 2.4 GeV in the LEPS angular range by assuming the isotropic production of the Θ+ in the γn center-of-mass system. The obtained results support the existence of the Θ+.

Original language	English
Article number	025210
Journal	Physical Review C - Nuclear Physics
Volume	79
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.79.025210
Publication status	Published - 2009 Feb 2
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.79.025210

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Nakano, T., Muramatsu, N., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., Chang, W. C., Daté, S., Ejiri, H., Fujimura, H., Fujiwara, M., Fukui, S., Hasegawa, H., Hicks, K., Horie, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., ... Zegers, R. G. T. (2009). Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs. Physical Review C - Nuclear Physics, 79(2), Article 025210. https://doi.org/10.1103/PhysRevC.79.025210

Nakano, T, Muramatsu, N, Ahn, DS, Ahn, JK, Akimune, H, Asano, Y, Chang, WC, Daté, S, Ejiri, H, Fujimura, H, Fujiwara, M, Fukui, S, Hasegawa, H, Hicks, K, Horie, K, Hotta, T, Imai, K, Ishikawa, T, Iwata, T, Kato, Y, Kawai, H, Kim, ZY, Kino, K, Kohri, H, Kumagai, N, Makino, S, Matsuda, T, Matsuoka, N, Matsumura, T, Mibe, T, Miyabe, M, Miyachi, Y, Niiyama, M, Nomachi, M, Ohashi, Y, Ohkuma, H, Ooba, T, Oshuev, DS, Rangacharyulu, C, Sakaguchi, A, Shagin, PM, Shiino, Y, Shimizu, A, Shimizu, H, Sugaya, Y, Sumihama, M, Toi, Y, Toyokawa, H, Wakai, A, Wang, CW, Wang, SC, Yonehara, K, Yorita, T, Yoshimura, M, Yosoi, M & Zegers, RGT 2009, 'Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs', Physical Review C - Nuclear Physics, vol. 79, no. 2, 025210. https://doi.org/10.1103/PhysRevC.79.025210

@article{adfc9277391f420abc32a4cece5499bf,

title = "Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs",

abstract = "The γd→K+K-pn reaction has been studied to search for the evidence of the Θ+ by detecting K+K- pairs at forward angles. The Fermi-motion-corrected nK+ invariant mass distribution shows a narrow peak at 1.524±0.002+0.003 GeV/c2. The statistical significance of the peak calculated from a shape analysis is 5.1 σ, and the differential cross section for the γn→K-Θ+ reaction is estimated to be 12±2 nb/sr in the photon energy range from 2.0 to 2.4 GeV in the LEPS angular range by assuming the isotropic production of the Θ+ in the γn center-of-mass system. The obtained results support the existence of the Θ+.",

author = "T. Nakano and N. Muramatsu and Ahn, \{D. S.\} and Ahn, \{J. K.\} and H. Akimune and Y. Asano and Chang, \{W. C.\} and S. Dat{\'e} and H. Ejiri and H. Fujimura and M. Fujiwara and S. Fukui and H. Hasegawa and K. Hicks and K. Horie and T. Hotta and K. Imai and T. Ishikawa and T. Iwata and Y. Kato and H. Kawai and Kim, \{Z. Y.\} and K. Kino and H. Kohri and N. Kumagai and S. Makino and T. Matsuda and N. Matsuoka and T. Matsumura and T. Mibe and M. Miyabe and Y. Miyachi and M. Niiyama and M. Nomachi and Y. Ohashi and H. Ohkuma and T. Ooba and Oshuev, \{D. S.\} and C. Rangacharyulu and A. Sakaguchi and Shagin, \{P. M.\} and Y. Shiino and A. Shimizu and H. Shimizu and Y. Sugaya and M. Sumihama and Y. Toi and H. Toyokawa and A. Wakai and Wang, \{C. W.\} and Wang, \{S. C.\} and K. Yonehara and T. Yorita and M. Yoshimura and M. Yosoi and Zegers, \{R. G.T.\}",

year = "2009",

month = feb,

day = "2",

doi = "10.1103/PhysRevC.79.025210",

language = "English",

volume = "79",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "2",

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TY - JOUR

T1 - Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs

AU - Nakano, T.

AU - Muramatsu, N.

AU - Ahn, D. S.

AU - Ahn, J. K.

AU - Akimune, H.

AU - Asano, Y.

AU - Chang, W. C.

AU - Daté, S.

AU - Ejiri, H.

AU - Fujimura, H.

AU - Fujiwara, M.

AU - Fukui, S.

AU - Hasegawa, H.

AU - Hicks, K.

AU - Horie, K.

AU - Hotta, T.

AU - Imai, K.

AU - Ishikawa, T.

AU - Iwata, T.

AU - Kato, Y.

AU - Kawai, H.

AU - Kim, Z. Y.

AU - Kino, K.

AU - Kohri, H.

AU - Kumagai, N.

AU - Makino, S.

AU - Matsuda, T.

AU - Matsuoka, N.

AU - Matsumura, T.

AU - Mibe, T.

AU - Miyabe, M.

AU - Miyachi, Y.

AU - Niiyama, M.

AU - Nomachi, M.

AU - Ohashi, Y.

AU - Ohkuma, H.

AU - Ooba, T.

AU - Oshuev, D. S.

AU - Rangacharyulu, C.

AU - Sakaguchi, A.

AU - Shagin, P. M.

AU - Shiino, Y.

AU - Shimizu, A.

AU - Shimizu, H.

AU - Sugaya, Y.

AU - Sumihama, M.

AU - Toi, Y.

AU - Toyokawa, H.

AU - Wakai, A.

AU - Wang, C. W.

AU - Wang, S. C.

AU - Yonehara, K.

AU - Yorita, T.

AU - Yoshimura, M.

AU - Yosoi, M.

AU - Zegers, R. G.T.

PY - 2009/2/2

Y1 - 2009/2/2

N2 - The γd→K+K-pn reaction has been studied to search for the evidence of the Θ+ by detecting K+K- pairs at forward angles. The Fermi-motion-corrected nK+ invariant mass distribution shows a narrow peak at 1.524±0.002+0.003 GeV/c2. The statistical significance of the peak calculated from a shape analysis is 5.1 σ, and the differential cross section for the γn→K-Θ+ reaction is estimated to be 12±2 nb/sr in the photon energy range from 2.0 to 2.4 GeV in the LEPS angular range by assuming the isotropic production of the Θ+ in the γn center-of-mass system. The obtained results support the existence of the Θ+.

AB - The γd→K+K-pn reaction has been studied to search for the evidence of the Θ+ by detecting K+K- pairs at forward angles. The Fermi-motion-corrected nK+ invariant mass distribution shows a narrow peak at 1.524±0.002+0.003 GeV/c2. The statistical significance of the peak calculated from a shape analysis is 5.1 σ, and the differential cross section for the γn→K-Θ+ reaction is estimated to be 12±2 nb/sr in the photon energy range from 2.0 to 2.4 GeV in the LEPS angular range by assuming the isotropic production of the Θ+ in the γn center-of-mass system. The obtained results support the existence of the Θ+.

UR - https://www.scopus.com/pages/publications/61949261197

U2 - 10.1103/PhysRevC.79.025210

DO - 10.1103/PhysRevC.79.025210

M3 - Article

AN - SCOPUS:61949261197

SN - 0556-2813

VL - 79

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 2

M1 - 025210

ER -

Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs

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