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

T. Nakano, N. Muramatsu, D. S. Ahn, Jung Keun 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 & 36 others 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

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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 languageEnglish
Article number025210
JournalPhysical Review C - Nuclear Physics
Volume79
Issue number2
DOIs
Publication statusPublished - 2009 Feb 2
Externally publishedYes

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mass distribution
center of mass
cross sections
photons
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Nakano, T., Muramatsu, N., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., ... 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), [025210]. https://doi.org/10.1103/PhysRevC.79.025210

Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs. / Nakano, T.; Muramatsu, N.; Ahn, D. S.; Ahn, Jung Keun; 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.; Kato, Y.; Kawai, H.; Kim, Z. Y.; 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, D. S.; Rangacharyulu, C.; Sakaguchi, A.; Shagin, P. M.; Shiino, Y.; Shimizu, A.; Shimizu, H.; Sugaya, Y.; Sumihama, M.; Toi, Y.; Toyokawa, H.; Wakai, A.; Wang, C. W.; Wang, S. C.; Yonehara, K.; Yorita, T.; Yoshimura, M.; Yosoi, M.; Zegers, R. G T.

In: Physical Review C - Nuclear Physics, Vol. 79, No. 2, 025210, 02.02.2009.

Research output: Contribution to journalArticle

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
Nakano, T. ; Muramatsu, N. ; Ahn, D. S. ; Ahn, Jung Keun ; 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. ; Kato, Y. ; Kawai, H. ; Kim, Z. Y. ; 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, D. S. ; Rangacharyulu, C. ; Sakaguchi, A. ; Shagin, P. M. ; Shiino, Y. ; Shimizu, A. ; Shimizu, H. ; Sugaya, Y. ; Sumihama, M. ; Toi, Y. ; Toyokawa, H. ; Wakai, A. ; Wang, C. W. ; Wang, S. C. ; Yonehara, K. ; Yorita, T. ; Yoshimura, M. ; Yosoi, M. ; Zegers, R. G T. / Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs. In: Physical Review C - Nuclear Physics. 2009 ; Vol. 79, No. 2.
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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+.",
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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, Jung Keun

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+.

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U2 - 10.1103/PhysRevC.79.025210

DO - 10.1103/PhysRevC.79.025210

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