Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Apartado 22085, 46071 Valencia, Spain.
Phys Rev Lett. 2010 Aug 27;105(9):092001. doi: 10.1103/PhysRevLett.105.092001. Epub 2010 Aug 26.
We use a theoretical model of the γd→K+ K- np reaction adapted to the experiment done at LEPS where a peak was observed and associated with the Θ+ (1540) pentaquark. The study shows that the method used in the experiment to assign momenta to the undetected proton and neutron, together with the chosen cuts, necessarily creates an artificial broad peak in the assumed K+ n invariant mass in the region of the claimed Θ+ (1540), such that the remaining strength seen for the experimental peak is compatible with a fluctuation of 2σ significance.
我们使用了一个经过修正的 γd→K+ K- np 反应理论模型，该模型适用于 LEPS 实验，在该实验中观察到了一个峰，并将其与 Θ+（1540）五夸克关联起来。研究表明，实验中用于给未探测到的质子和中子分配动量的方法，以及所选择的切割条件，必然会在假设的 K+ n 不变质量区域中人为地产生一个宽峰，以至于实验峰的剩余强度与 2σ 意义上的波动是一致的。
