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arXiv 0904.2034nucl-ex
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质子和氘核近阈光生$Λ(1520)$

Near-threshold photoproduction of $Λ(1520)$ from protons and deuterons

LEPS Collaboration, N. Muramatsu, J. Y. Chen, W. C. Chang, D. S. Ahn, J. K. Ahn, H. Akimune, Y. Asano, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, S. Fukui, S.… 展开作者

LEPS Collaboration, N. Muramatsu, J. Y. Chen, W. C. Chang, D. S. Ahn, J. K. Ahn, H. Akimune, Y. Asano, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, S. Fukui, S. Hasegawa, K. Hicks, K. Horie, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, Y. Kato, H. Kawai, K. Kino, H. Kohri, N. Kumagai, S. Makino, T. Matsuda, T. Matsumura, N. Matsuoka, T. Mibe, M. Miyabe, M. Miyachi, T. Nakano, M. Niiyama, M. Nomachi, Y. Ohashi, H. Ohkuma, T. Ooba, D. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, P. M. Shagin, Y. Shiino, 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

摘要:

在SPring-8 LEPS实验中,在低于2.4 GeV的光子能量下,研究了用液氢和氘靶光生$Λ$(1520)。第一次,微分截面在低能量和氘靶测量。在后向K $^{+/0}$角处观察到质子和中子产生截面的大的不对称性。这表明了接触项的重要性,它与t-通道K交换下规范不变性共存。这种解释是兼容的微分截面,衰变的不对称性,和光子束的不对称性,在生产质子在前向K $^+$角。

英文摘要:

Photoproduction of $Λ$(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K$^{+/0}$ angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K$^+$ angles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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