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Institut de Physique Nucléaire, Orsay, France.
Phys Rev Lett. 2006 Jul 21;97(3):032001. doi: 10.1103/PhysRevLett.97.032001. Epub 2006 Jul 17.
For the first time, the reaction gammad-->DeltanK+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant-mass distribution. The upper limit on the gammad-->DeltaTheta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.
首次对反应γd→ΔnK⁺进行了分析，以寻找奇异五夸克重子Θ⁺(1540)。数据是在杰斐逊实验室获取的，使用了能量在0.8至3.6 GeV之间的霍尔B标记光子束以及CEBAF大接受度谱仪(CLAS)。在nK⁺不变质量分布中未观察到具有统计显著性的结构。已计算出γd→ΔΘ⁺积分截面的上限，发现其在5至25纳靶之间，具体取决于所假设的产生模型。还报告了微分截面的上限。
