论文标题
独家张量梅森光生产
Exclusive tensor meson photoproduction
论文作者
论文摘要
我们在谐振区域以外，在几个GEV的光束能量外研究张量的梅森光生物增生。我们建立了一个基于Regge理论的模型，其中包括领先的向量和轴向交换。我们考虑了未知螺旋耦合的两个确定，并符合CLAS的最新A2光生生产数据。这两种选择都给出了A2横截面的类似描述，但会导致对奇偶校验不对称和F2光增生截面的不同预测。我们得出的结论是，需要在正向区域中F2光生源的新测量来固定正确的生产机制。我们还将预测扩展到了当前实验正在运行的8.5 GEV束能量。
We study tensor meson photoproduction outside of the resonance region, at beam energies of few GeVs. We build a model based on Regge theory that includes the leading vector and axial exchanges. We consider two determinations of the unknown helicity couplings, and fit to the recent a2 photoproduction data from CLAS. Both choices give a similar description of the a2 cross section, but result in different predictions for the parity asymmetries and the f2 photoproduction cross section. We conclude that new measurements of f2 photoproduction in the forward region are needed to pin down the correct production mechanism. We also extend our predictions to the 8.5 GeV beam energy, where current experiments are running.
