~ 3 He光致硬衰变成Pd对
Hard Photodisintegration of 3He into pd pair
摘要：
最近对$^3He$核到$pd$对在$90^0$质心处的高能光致蜕变的测量表明，能量标度符合夸克计数规则，并且$s^{-17}$指数空前地大。为了理解这一过程的基本机制，我们扩展了硬再散射机制的理论形式来计算$γ^3He\rightarrow pd$反应。在HRM中，入射的高能光子撞击靶中一个核子的夸克，该夸克随后与另一个核子的夸克发生硬再散射，在反应的终态产生硬二体系统。在HRM框架内，我们导出了反应微分截面的无参数表达式，它由$^3He\rightarrow pd$跃迁谱函数、硬$pd\rightarrow pd$散射截面和硬再散射过程中夸克有效电荷的交换来表示.所有这些因素的数值估计导致的截面的大小，这是令人惊讶的，在一个良好的协议与数据。
英文摘要：
The recent measurements of high energy photodisintegration of the $^3He$ nucleus to the $pd$ pair at $90^0$ center of mass demonstrated an energy scaling consistent with the quark counting rule with unprecedentedly large exponent of $s^{-17}$. To understand the underlying mechanism of this process we extended the theoretical formalism of hard rescattering mechanism to calculate the $γ^3He\rightarrow pd$ reaction. In HRM the incoming high energy photon strikes a quark from one of the nucleons in the target which subsequently undergoes hard rescattering with the quarks from the other nucleons generating hard two-body system in the final state of the reaction. Within the HRM we derived the parameter free expression for the differential cross section of the reaction, which is expressed through the $^3He\rightarrow pd$ transition spectral function, cross section of hard $pd\rightarrow pd$ scattering and the effective charge of the quarks being interchanged during the hard rescattering process. The numerical estimates of all these factors resulted in the magnitude of the cross section which is surprisingly in a good agreement with the data.
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