阈附近γp→K⁺K⁻p反应中ϕ与Λ(1520)产生道之间的干涉效应
Interference Effect between ϕ and Λ(1520) Production Channels in the γp→K^{+}K^{-}p Reaction near Threshold.
作者信息
Ryu S Y, Ahn J K, Nakano T, Ahn D S, Ajimura S, Akimune H, Asano Y, Chang W C, Chen J Y, Daté S, Ejiri H, Fujimura H, Fujiwara M, Fukui S, Hasegawa S, Hicks K, Horie K, Hotta T, Hwang S H, Imai K, Ishikawa T, Iwata T, Kato Y, Kawai H, Kino K, Kohri H, Kon Y, Kumagai N, Lin P J, Maeda Y, Makino S, Matsuda T, Matsuoka N, Mibe T, Miyabe M, Miyachi M, Morino Y, Muramatsu N, Murayama R, Nakatsugawa Y, Nam S I, Niiyama M, Nomachi M, Ohashi Y, Ohkuma H, Ohta T, Ooba T, Oshuev D S, Parker J D, Rangacharyulu C, Sakaguchi A, Sawada T, Shagin P M, Shiino Y, Shimizu H, Strokovsky E A, Sugaya Y, Sumihama M, Tokiyasu A O, Toi Y, Toyokawa H, Tsunemi T, Uchida M, Ungaro M, Wakai A, Wang C W, Wang S C, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers R G T
机构信息
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan.
Department of Physics, Korea University, Seoul 02841, Republic of Korea.
出版信息
Phys Rev Lett. 2016 Jun 10;116(23):232001. doi: 10.1103/PhysRevLett.116.232001. Epub 2016 Jun 7.
The ϕ-Λ(1520) interference effect in the γp→K^{+}K^{-}p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between ϕ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K^{+}K^{-} 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 GeV bump structure in forward differential cross sections for ϕ 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.
首次在1.673至2.173 GeV的能量范围内测量了γp→K⁺K⁻p反应中的ϕ - Λ(1520)干涉效应。在两个共振重叠的运动学区域获得了ϕ和Λ(1520)产生振幅之间的相对相位。测量结果表明，当在向前角度观察到K⁺K⁻对时存在强相长干涉，而对于向前角度的质子发射则存在相消干涉。此外，观察到的干涉效应并不能解释ϕ光生向前微分截面中√s = 2.1 GeV的凸起结构。这一事实表明可能存在奇异结构，如隐藏奇异五夸克态、新的坡密子交换或通过其他超子态的再散射过程。
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