Λ Polarization at 90° in K + Λ Photoproduction
Λ Polarization at 90° in K + Λ Photoproduction
复制标题
K + Λ 摄影制作中 Λ 90° 偏振
DOI：
10.1103/physrev.159.1213
复制
发表时间：
1967
期刊：
影响因子：
--
通讯作者：
J. Marshall
中科院分区：
文献类型：
--
作者：
D. Groom;J. Marshall
用加州理工学院的同步加速器，在90厘米系统和1100、1200和1300 MeV的实验室光子能量下，测量了γ+ p→ K++ Λ反应的Λ极化和微分截面。来自Λ的不对称衰变的质子被放置在生产平面上方和下方的计数器检测到。K介子是通过它们在厚距离望远镜中的行为来识别的。极化结果在1100 MeV时为P Λ=+0.34 ±0.09，1200 MeV时为+0.30 ±0.07，1300 MeV时为+0.08 ±0.07，其中P Λ在p^ γ× p^ Λ方向上测量。微分截面在能量为0.14±0.01 μB/sr时是恒定的。虽然在总能量为1700 MeV的90 °极化中的明显凸起为这里引起共振的模型提供了支持，但并没有真正的新结论。
The Λ polarization and the differential cross section for the reaction γ+ p→ K++ Λ have been measured, using the Caltech synchrotron, at 90 in the cm system and at laboratory photon energies of 1100, 1200, and 1300 MeV. Protons from the asymmetric decay of the Λ were detected by counters placed above and below the production plane. Kaons were identified by their behavior in a thick range telescope. Polarization results were P Λ=+ 0.34±0.09 at 1100 MeV,+ 0.30±0.07 at 1200 MeV, and+ 0.08±0.07 at 1300 MeV, where P Λ was measured in the p^ γ× p^ Λ direction. The differential cross section was constant with energy at 0.14±0.01 μb/sr. Although the apparent bump in the polarization at 90 at a total energy of≈ 1700 MeV adds support to models which invoke a resonance here, no really new conclusions can be reached.