arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1004.0353nucl-th
收藏

核子上电磁k介子产生的贝叶斯模型选择

Bayesian model selection for electromagnetic kaon production on the nucleon

L. De Cruz, D. G. Ireland, P. Vancraeyveld, J. Ryckebusch

摘要:

我们提出了一个Regge模型的贝叶斯分析的结果来描述的背景贡献K+ λ和K+ Σ 0光合作用。该模型基于T通道中K+(494)和K*+(892)轨迹的交换。我们利用贝叶斯证据Z来确定每个通道的最佳模型变量。使用嵌套抽样算法计算贝叶斯证据积分。对于不同的先验宽度,我们找到了K+ λ光生Regge模型的决定性贝叶斯证据(Δln Z ~ 24),其中K+(892)轨道具有正的矢量耦合和负的张量耦合常数,两个轨道都具有旋转相位因子.使用卡方最小化方法,无法从同一数据集得出这一结论。另一方面,对于K+ Sigma 0光生Regge模型,证据积分之间的差异不足以确定一个模型变体。

英文摘要:

We present the results of a Bayesian analysis of a Regge model to describe the background contribution for K+ Lambda and K+ Sigma0 photoproduction. The model is based on the exchange of K+(494) and K*+(892) trajectories in the t-channel. We utilise the Bayesian evidence Z to determine the best model variant for each channel. The Bayesian evidence integrals were calculated using the Nested Sampling algorithm. For different prior widths, we find decisive Bayesian evidence (Δln Z ~ 24) for a K+ Lambda photoproduction Regge model with a positive vector coupling and a negative tensor coupling constant for the K*+(892) trajectory, and a rotating phase factor for both trajectories. Using the chi^2 minimisation method, one could not draw this conclusion from the same dataset. For the K+ Sigma0 photoproduction Regge model, on the other hand, the difference between the evidence integrals is insufficient to pinpoint one model variant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑