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arXiv 0806.3140hep-phhep-ex
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中间介子再散射对$e^+e^- \to J/ψ+ η_c$的可能贡献

Possible contributions to $e^+e^- \to J/ψ+ η_c$ due to intermediate meson rescatterings

Yuan-Jiang Zhang, Qiang Zhao, Cong-Feng Qiao

摘要:

受$\sqrt{s}\simeq 10.6$ GeV的$e^+ e^-\to J/ψ+η_c$实验与非相对论QCD(NRQCD)研究之间的明显差异的启发,我们研究了中间介子环作为长程相互作用跃迁对这一过程的贡献.中间介子环包括$D\bar D(\bar D^\ast)$、$D\bar D^\ast(D {or} D^\ast)$、$D^\ast \bar D^\ast(D)$和相应的$D_s$中间介子。在实验数据对顶点耦合的约束下,我们发现在因子参数的合理截止能范围内,中间介子环对截面的$2.7\sim 6.7 fb$起了解释作用.我们还调查了吸收部分的贡献,发现它约占$0.58\sim 1.38 fb$。这些结果意味着长程相互作用跃迁的贡献可能仍然在这样的能量区域中发挥作用。

英文摘要:

Inspired by the obvious discrepancies between experiment and non-relativistic QCD (NRQCD) studies of $e^+ e^-\to J/ψ+η_c$ at $\sqrt{s}\simeq 10.6$ GeV, we investigate contributions from intermediate meson loops as long-range interaction transitions to this process. The intermediate meson loops include $D\bar D(\bar D^\ast)$, $D\bar D^\ast(D {or} D^\ast)$, $D^\ast \bar D^\ast(D)$ and corresponding $D_s$ intermediate mesons. With the constraints from experimental data on the vertex couplings, we find that the intermediate meson loops account for $2.7\sim 6.7 fb$ of the cross sections within a reasonable range of cut-off energies of the factor parameter. We also investigate contributions from the absorptive part and find that it accounts for approximately $0.58\sim 1.38 fb$. These results imply that contributions from long-range interaction transitions may still play a role in such an energy region.

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