The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV

M. Sumihama, Jung Keun Ahn, H. Akimune, Y. Asano, C. Bennhold, W. C. Chang, T. Corthals, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, M. Guidal, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, H. Kawai, Z. Y. Kim, K. Kino & 33 others H. Kohri, N. Kumagai, S. Makino, T. Mart, T. Matsumura, N. Matsuoka, T. Mibe, M. Miyabe, Y. Miyachi, M. Morita, N. Muramatsu, T. Nakano, M. Niiyama, M. Nomachi, Y. Ohashi, T. Ooba, H. Ohkuma, D. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sasaki, P. M. Shagin, Y. Shiino, H. Shimizu, Y. Sugaya, H. Toyokawa, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yosoi, R. G T Zegers

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Abstract

Differential cross sections and photon-beam asymmetries for the γ→p→K+Λ and γ→p→K+Σ0 reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from Θc.m.=0° to 60° of the K+ scattering angle in the center-of-mass system at the SPring-8/LEPS facility. The photon-beam asymmetries for both the reactions have been found to be positive and to increase with the photon energy. The measured differential cross sections agree with the data measured by the CLAS Collaboration at cosΘc.m.<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K+Λ reaction is large at cosΘc.m.>0.9. In the K+Λ reaction, the resonance-like structure found in the CLAS and SAPHIR data at W=1.96 GeV is confirmed. The differential cross sections at forward angles suggest a strong K-exchange contribution in the t-channel for the K+Λ reaction, but not for the K+Σ0 reaction.

Original languageEnglish
Article number035214
JournalPhysical Review C - Nuclear Physics
Volume73
Issue number3
DOIs
Publication statusPublished - 2006 Apr 7
Externally publishedYes

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photons
photon beams
cross sections
energy
asymmetry
center of mass
scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

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The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV. / Sumihama, M.; Ahn, Jung Keun; Akimune, H.; Asano, Y.; Bennhold, C.; Chang, W. C.; Corthals, T.; Daté, S.; Ejiri, H.; Fujimura, H.; Fujiwara, M.; Guidal, M.; Hicks, K.; Hotta, T.; Imai, K.; Ishikawa, T.; Iwata, T.; Kawai, H.; Kim, Z. Y.; Kino, K.; Kohri, H.; Kumagai, N.; Makino, S.; Mart, T.; Matsumura, T.; Matsuoka, N.; Mibe, T.; Miyabe, M.; Miyachi, Y.; Morita, M.; Muramatsu, N.; Nakano, T.; Niiyama, M.; Nomachi, M.; Ohashi, Y.; Ooba, T.; Ohkuma, H.; Oshuev, D. S.; Rangacharyulu, C.; Sakaguchi, A.; Sasaki, T.; Shagin, P. M.; Shiino, Y.; Shimizu, H.; Sugaya, Y.; Toyokawa, H.; Wakai, A.; Wang, C. W.; Wang, S. C.; Yonehara, K.; Yorita, T.; Yosoi, M.; Zegers, R. G T.

In: Physical Review C - Nuclear Physics, Vol. 73, No. 3, 035214, 07.04.2006.

Research output: Contribution to journalArticle

Sumihama, M, Ahn, JK, Akimune, H, Asano, Y, Bennhold, C, Chang, WC, Corthals, T, Daté, S, Ejiri, H, Fujimura, H, Fujiwara, M, Guidal, M, Hicks, K, Hotta, T, Imai, K, Ishikawa, T, Iwata, T, Kawai, H, Kim, ZY, Kino, K, Kohri, H, Kumagai, N, Makino, S, Mart, T, Matsumura, T, Matsuoka, N, Mibe, T, Miyabe, M, Miyachi, Y, Morita, M, Muramatsu, N, Nakano, T, Niiyama, M, Nomachi, M, Ohashi, Y, Ooba, T, Ohkuma, H, Oshuev, DS, Rangacharyulu, C, Sakaguchi, A, Sasaki, T, Shagin, PM, Shiino, Y, Shimizu, H, Sugaya, Y, Toyokawa, H, Wakai, A, Wang, CW, Wang, SC, Yonehara, K, Yorita, T, Yosoi, M & Zegers, RGT 2006, 'The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV', Physical Review C - Nuclear Physics, vol. 73, no. 3, 035214. https://doi.org/10.1103/PhysRevC.73.035214
Sumihama, M. ; Ahn, Jung Keun ; Akimune, H. ; Asano, Y. ; Bennhold, C. ; Chang, W. C. ; Corthals, T. ; Daté, S. ; Ejiri, H. ; Fujimura, H. ; Fujiwara, M. ; Guidal, M. ; Hicks, K. ; Hotta, T. ; Imai, K. ; Ishikawa, T. ; Iwata, T. ; Kawai, H. ; Kim, Z. Y. ; Kino, K. ; Kohri, H. ; Kumagai, N. ; Makino, S. ; Mart, T. ; Matsumura, T. ; Matsuoka, N. ; Mibe, T. ; Miyabe, M. ; Miyachi, Y. ; Morita, M. ; Muramatsu, N. ; Nakano, T. ; Niiyama, M. ; Nomachi, M. ; Ohashi, Y. ; Ooba, T. ; Ohkuma, H. ; Oshuev, D. S. ; Rangacharyulu, C. ; Sakaguchi, A. ; Sasaki, T. ; Shagin, P. M. ; Shiino, Y. ; Shimizu, H. ; Sugaya, Y. ; Toyokawa, H. ; Wakai, A. ; Wang, C. W. ; Wang, S. C. ; Yonehara, K. ; Yorita, T. ; Yosoi, M. ; Zegers, R. G T. / The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV. In: Physical Review C - Nuclear Physics. 2006 ; Vol. 73, No. 3.
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title = "The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV",
abstract = "Differential cross sections and photon-beam asymmetries for the γ→p→K+Λ and γ→p→K+Σ0 reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from Θc.m.=0° to 60° of the K+ scattering angle in the center-of-mass system at the SPring-8/LEPS facility. The photon-beam asymmetries for both the reactions have been found to be positive and to increase with the photon energy. The measured differential cross sections agree with the data measured by the CLAS Collaboration at cosΘc.m.<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K+Λ reaction is large at cosΘc.m.>0.9. In the K+Λ reaction, the resonance-like structure found in the CLAS and SAPHIR data at W=1.96 GeV is confirmed. The differential cross sections at forward angles suggest a strong K-exchange contribution in the t-channel for the K+Λ reaction, but not for the K+Σ0 reaction.",
author = "M. Sumihama and Ahn, {Jung Keun} and H. Akimune and Y. Asano and C. Bennhold and Chang, {W. C.} and T. Corthals and S. Dat{\'e} and H. Ejiri and H. Fujimura and M. Fujiwara and M. Guidal and K. Hicks and T. Hotta and K. Imai and T. Ishikawa and T. Iwata and H. Kawai and Kim, {Z. Y.} and K. Kino and H. Kohri and N. Kumagai and S. Makino and T. Mart and T. Matsumura and N. Matsuoka and T. Mibe and M. Miyabe and Y. Miyachi and M. Morita and N. Muramatsu and T. Nakano and M. Niiyama and M. Nomachi and Y. Ohashi and T. Ooba and H. Ohkuma and Oshuev, {D. S.} and C. Rangacharyulu and A. Sakaguchi and T. Sasaki and Shagin, {P. M.} and Y. Shiino and H. Shimizu and Y. Sugaya and H. Toyokawa and A. Wakai and Wang, {C. W.} and Wang, {S. C.} and K. Yonehara and T. Yorita and M. Yosoi and Zegers, {R. G T}",
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T1 - The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV

AU - Sumihama, M.

AU - Ahn, Jung Keun

AU - Akimune, H.

AU - Asano, Y.

AU - Bennhold, C.

AU - Chang, W. C.

AU - Corthals, T.

AU - Daté, S.

AU - Ejiri, H.

AU - Fujimura, H.

AU - Fujiwara, M.

AU - Guidal, M.

AU - Hicks, K.

AU - Hotta, T.

AU - Imai, K.

AU - Ishikawa, T.

AU - Iwata, T.

AU - Kawai, H.

AU - Kim, Z. Y.

AU - Kino, K.

AU - Kohri, H.

AU - Kumagai, N.

AU - Makino, S.

AU - Mart, T.

AU - Matsumura, T.

AU - Matsuoka, N.

AU - Mibe, T.

AU - Miyabe, M.

AU - Miyachi, Y.

AU - Morita, M.

AU - Muramatsu, N.

AU - Nakano, T.

AU - Niiyama, M.

AU - Nomachi, M.

AU - Ohashi, Y.

AU - Ooba, T.

AU - Ohkuma, H.

AU - Oshuev, D. S.

AU - Rangacharyulu, C.

AU - Sakaguchi, A.

AU - Sasaki, T.

AU - Shagin, P. M.

AU - Shiino, Y.

AU - Shimizu, H.

AU - Sugaya, Y.

AU - Toyokawa, H.

AU - Wakai, A.

AU - Wang, C. W.

AU - Wang, S. C.

AU - Yonehara, K.

AU - Yorita, T.

AU - Yosoi, M.

AU - Zegers, R. G T

PY - 2006/4/7

Y1 - 2006/4/7

N2 - Differential cross sections and photon-beam asymmetries for the γ→p→K+Λ and γ→p→K+Σ0 reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from Θc.m.=0° to 60° of the K+ scattering angle in the center-of-mass system at the SPring-8/LEPS facility. The photon-beam asymmetries for both the reactions have been found to be positive and to increase with the photon energy. The measured differential cross sections agree with the data measured by the CLAS Collaboration at cosΘc.m.<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K+Λ reaction is large at cosΘc.m.>0.9. In the K+Λ reaction, the resonance-like structure found in the CLAS and SAPHIR data at W=1.96 GeV is confirmed. The differential cross sections at forward angles suggest a strong K-exchange contribution in the t-channel for the K+Λ reaction, but not for the K+Σ0 reaction.

AB - Differential cross sections and photon-beam asymmetries for the γ→p→K+Λ and γ→p→K+Σ0 reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from Θc.m.=0° to 60° of the K+ scattering angle in the center-of-mass system at the SPring-8/LEPS facility. The photon-beam asymmetries for both the reactions have been found to be positive and to increase with the photon energy. The measured differential cross sections agree with the data measured by the CLAS Collaboration at cosΘc.m.<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K+Λ reaction is large at cosΘc.m.>0.9. In the K+Λ reaction, the resonance-like structure found in the CLAS and SAPHIR data at W=1.96 GeV is confirmed. The differential cross sections at forward angles suggest a strong K-exchange contribution in the t-channel for the K+Λ reaction, but not for the K+Σ0 reaction.

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U2 - 10.1103/PhysRevC.73.035214

DO - 10.1103/PhysRevC.73.035214

M3 - Article

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JO - Physical Review C - Nuclear Physics

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