$A(p,{\bar p})X$反应中原子核中的致密重子组态和核物质中反质子形成长度的探测
Probing of compact baryonic configurations in nuclei in $A(p,{\bar p})X$ reactions and antiproton formation length in nuclear matter
摘要：
在实验室角度为10.5 $^{\circ}$和$^{\circ}$的条件下，测量了10 GeV质子轰击Be、Al、Cu和Ta靶产生反质子和负π介子的包含截面$σ^A=Ed^3{σ(X,P_t^2)/d^3p}$.在运动学允许区和运动学禁止区得到了自由核子上反质子产生的截面。反质子截面比随纵向变量$X$的变化呈现出三个不同的平台，这证明了在原子核结构的原子核-小距离标度物体中存在致密重子组态。测量的截面比与那些在包容性的电子散射离开核得到的可比性表明，弱的反质子吸收的核。观测到的截面比的行为被解释在一个模型的框架下考虑强子的生产作为一个破碎的夸克（反夸克）到强子。已经确定核物质中的反质子形成长度可以达到4. 5 fm量级。
英文摘要：
Inclusive cross sections $σ^A=Ed^3{σ(X,P_t^2)/d^3p}$ of antiproton and negative pion production on Be, Al, Cu and Ta targets hit by 10 GeV protons were measured at the laboratory angles of 10.5$^{\circ}$ and 59$^{\circ}$. Antiproton cross sections were obtained in both kinematically allowed and kinematically forbidden regions for antiproton production on a free nucleon. The antiproton cross section ratio as a function of the longitudinal variable $X$ exhibits three separate plateaus which gives evidence for the existence of compact baryon configurations in nuclei-small-distance scaled objects of nuclear structure. Comparability of the measured cross section ratios with those obtained in the inclusive electron scattering off nuclei suggests a weak antiproton absorption in nuclei. Observed behavior of the cross section ratios is interpreted in the framework of a model considering the hadron production as a fragmentation of quarks (antiquarks) into hadrons. It has been established that the antiproton formation length in nuclear matter can reach the magnitude of 4.5 fm.
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