Deep inelastic scattering at strong coupling from gauge/string duality: the saturation line
Deep inelastic scattering at strong coupling from gauge/string duality: the saturation line
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DOI：
10.1088/1126-6708/2008/01/026
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发表时间：
2007-10
影响因子：
5.4
通讯作者：
Y. Hatta;E. Iancu;A. Mueller
中科院分区：
文献类型：
--
作者：
Y. Hatta;E. Iancu;A. Mueller
对于采用对偶弦描述的规范理论，我们分析了在正则性极限附近，在强t Hooft耦合和高能下的深度非弹性散射。讨论了正则性修正的起始点，确定了在快速性和光子虚性参数空间中区分弱散射和强散射的饱和线。我们发现，通向一元性的途径通过两种不同的机制进行，这取决于光子的虚性Q2：在相对较低的Q2处的单Pmer子交换和在较高的Q2处的多个引力子交换。这意味着在高能和大Q2处的总截面是由衍射过程主导的。这进一步暗示了一种部分子描述，其中所有部分子的横向动量都低于饱和动量和一阶占据数。
For gauge theories which admit a dual string description, we analyze deep inelastic scattering at strong 't Hooft coupling and high energy, in the vicinity of the unitarity limit. We discuss the onset of unitarity corrections and determine the saturation line which separates weak scattering from strong scattering in the parameter space of rapidity and photon virtuality. We discover that the approach towards unitarity proceeds through two different mechanisms, depending upon the photon virtuality Q2: single Pomeron exchange at relatively low Q2 and, respectively, multiple graviton exchanges at higher Q2. This implies that the total cross-section at high energy and large Q2 is dominated by diffractive processes. This is furthermore suggestive of a partonic description where all the partons have transverse momenta below the saturation momentum and occupation numbers of order one.