Interference Effect betweenϕandΛ(1520)Production Channels in theγp→K+K−pReaction near Threshold
| Autor: | J. Y. Chen, Y. Nakatsugawa, S. i. Nam, R. G. T. Zegers, Jung Keun Ahn, P. M. Shagin, M. Fujiwara, Takashi Ohta, Y. Toi, Tetsuhiko Yorita, H. Kohri, Yoshikazu Maeda, E. A. Strokovsky, K. Kino, S. Hasegawa, M. Miyachi, C. W. Wang, T. Matsuda, S. Daté, Yuhei Morino, S. Ajimura, T. Ishikawa, M. Sumihama, T. Ooba, S. Fukui, M. Uchida, S. C. Wang, J. Parker, Tomoaki Hotta, Takahiro Iwata, S. Makino, R. Murayama, A. O. Tokiyasu, K. Hicks, Haruo Ohkuma, N. Kumagai, A. Wakai, Y. Shiino, W. C. Chang, Masaharu Nomachi, H. Ejiri, T. Nakano, Masato Yoshimura, Hidetoshi Akimune, S. Y. Ryu, K. Horie, Hiroyuki Toyokawa, P. J. Lin, Yuji Ohashi, D. S. Ahn, T. Sawada, Chary Rangacharyulu, H. Fujimura, K. Yonehara, H. Kawai, Y. Asano, Hajime Shimizu, D. S. Oshuev, T. Tsunemi, Kenichi Imai, Y. Kato, S. H. Hwang, N. Matsuoka, Atsushi Sakaguchi, Yorihito Sugaya, Norihito Muramatsu, M. Ungaro, M. Yosoi, Y. Kon, Tsutomu Mibe, Manabu Miyabe, M. Niiyama |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Particle physics 010308 nuclear & particles physics Hyperon General Physics and Astronomy State (functional analysis) Lambda 01 natural sciences Pentaquark Pomeron 0103 physical sciences Production (computer science) Atomic physics Proton emission Nuclear Experiment 010306 general physics Energy (signal processing) |
| Zdroj: | Physical Review Letters. 116 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | The $\ensuremath{\phi}\text{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}(1520)$ interference effect in the $\ensuremath{\gamma}p\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}p$ reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between $\ensuremath{\phi}$ and $\mathrm{\ensuremath{\Lambda}}(1520)$ production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when ${K}^{+}{K}^{\ensuremath{-}}$ pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the $\sqrt{s}=2.1\text{ }\text{ }\mathrm{GeV}$ bump structure in forward differential cross sections for $\ensuremath{\phi}$ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states. |
| Databáze: | OpenAIRE |
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