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arXiv 1105.3847hep-ph
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在$\sqrt{s}\leq 15$ GeV的$\bar pp$碰撞中独家生产$\barΞΞ$和$\barΞ_cΞ_c$

Exclusive $\barΞΞ$ and $\barΞ_cΞ_c$ production in $\bar pp$ collisions at $\sqrt{s}\leq 15$ GeV

A. I. Titov, B. Kampfer

摘要:

本文对能量为$\sqrt{s}\lesssim 15$ GeV的反应$\bar pp\to \bar ΞΞ$和$\bar pp\to \bar Ξ_cΞ_c$的微分截面和纵向不对称性进行了估计。假设$Ξ$和$Ξ_c$超子的产生过程分为两步:首先,产生中间态$\barΛΛ$和/或$\barΛ_cΛ_c$,然后转化为最终态$\bar ΞΞ$、$\bar Ξ_cΞ_c$和$\bar Ξ_cΞ_c$。全振幅描述的修改后的Regge模型内的回路图,平面夸克图的拓扑分解的基础上。发现$\bar Ξ_cΞ_c$与$\bar ΞΞ$和$\bar Λ_cΛ_c$与$\bar ΛΛ$的产额比对SU(4)对称性破坏程度有很强的敏感性。

英文摘要:

Estimates of differential cross sections and longitudinal asymmetries are presented for the reactions $\bar pp\to \bar ΞΞ$ and $\bar pp\to \bar Ξ_cΞ_c$ at energies $\sqrt{s}\lesssim 15$ GeV. The $Ξ$ and $Ξ_c$ hyperons are assumed to be produced in two-step processes: first, intermediate $\barΛΛ$ and/or $\barΛ_cΛ_c$ states are created which are converted afterwards into final states $\bar ΞΞ$, $\bar Ξ_cΞ_c$ and $\bar Ξ_cΞ_c$. The full amplitudes are described by loop diagrams within a modified Regge model, based on the topological decomposition of planar quark diagrams. A strong sensitivity of the ratio of yields of $\bar Ξ_cΞ_c$ to $\bar ΞΞ$ and of $\bar Λ_cΛ_c$ to $\bar ΛΛ$ to the degree of SU(4) symmetry violation is found.

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