arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1203.0979nucl-thhep-ph
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核介质中的$J/ψ$反应机制和抑制

$J/ψ$ reaction mechanisms and suppression in the nuclear medium

R. Molina, C. W. Xiao, E. Oset

摘要:

最近对矢量介子与原子核相互作用的研究使得研究$J/ψ$与原子核的相互作用以及研究$J/ψ$在其通过核介质传播时受到抑制的起源成为可能和有利条件。我们观察到$J/ψN$到$VN$的转变,其中$V$是光矢量,$ρ, ω,ϕ$,以及非弹性通道,$J/ψN \to \bar D Λ_c$和$J/ψN \to \bar D Σ_c$导致非弹性截面的特定形状。类似地,我们考虑了交换的$D$与核子碰撞并给出$πΛ_c$或$πΣ_c$的机制。截面在$\sqrt s=4415$ MeV附近有一个峰,其中$J/ψN$与最近预测的共振耦合。我们研究了10 GeV左右电子在重核中产生的$J/ψ$的透明度比,发现重核中产生的$J/ψ$有30 - 35%被吸收到核内。该比值与$J/ψ$的消耗一致,尽管在其他反应中观察到物质。

英文摘要:

Recent studies of the interaction of vector mesons with nuclei make possible and opportune the study of the interaction of the $J/ψ$ with nuclei and the investigation of the origin of the $J/ψ$ suppression in its propagation thorough a nuclear medium. We observe that the transition of $J/ψN$ to $VN$ with $V$ being a light vector, $ρ, ω,ϕ$, together with the inelastic channels, $J/ψN \to \bar D Λ_c$ and $J/ψN \to \bar D Σ_c$ leads to a particular shape of the inelastic cross section. Analogously, we consider the mechanisms where the exchanged $D$ collides with a nucleon and gives $πΛ_c$ or $πΣ_c$. The cross section has a peak around $\sqrt s=4415$ MeV, where the $J/ψN$ couples to a resonance predicted recently. We study the transparency ratio for electron induced $J/ψ$ production in nuclei at about 10 GeV and find that 30 - 35% of the $J/ψ$ produced in heavy nuclei are absorbed inside the nucleus. This ratio is in line with depletions of $J/ψ$ though matter observed in other reactions.

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。

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