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arXiv 1503.04719hep-ph
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从部分子模型看电荷交换反应

Charge-exchange reactions from the standpoint of the parton model

M. L. Nekrasov

摘要:

使用简单的参数,我们表明,在高能量的电荷交换反应通过硬散射的快夸克。在此基础上,我们描述了$π^- p \to M^0 n$和$K^- p \to M^0 Λ$,$M^0 =π^0, η, η'$,在一个组合的方法,它定义了硬贡献的部分子模型和软的Regge唯象。根据最近的GAMS-4 $π$数据,在$|t| \approx$ 0.4- 0.5(GeV $\!$ /c)$^2$的微分截面$K^- p \to ηΛ$中,在过渡到相对高的动量时,下降的消失被解释为硬贡献的总和从相干到非相干的模式变化的表现。所提到的模式变化的其他表现进行了讨论。得到了$η$ - $η'$混合和$η'$中胶子混合的约束条件。

英文摘要:

Using simple arguments, we show that charge-exchange reactions at high energies go through the hard scattering of fast quarks. On this basis we describe $π^- p \to M^0 n$ and $K^- p \to M^0 Λ$, $M^0 =π^0, η, η'$, in a combined approach which defines hard contributions in the parton model and soft ones in Regge phenomenology. The disappearance of a dip according to recent GAMS-4$π$ data in the differential cross-section $K^- p \to ηΛ$ at $|t| \approx$ 0.4--0.5 (GeV$\!$/c)$^2$ at transition to relatively high momenta, is explained as a manifestation of a mode change of summation of hard contributions from coherent to incoherent. Other manifestations of the mentioned mode change are discussed. Constraints on the $η$--$η'$ mixing and gluonium admixture in $η'$ are obtained.

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