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arXiv 1608.06402hep-th
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高维理论中散射振幅的解析性质和渐近行为

Analyticity Properties and Asymptotic Behavior of Scattering Amplitude in Higher Dimensional Theories

Jnanadeva Maharana

摘要:

研究了在高维场论中有质量、中性和无自旋粒子的散射振幅的高能行为。采用Lehmann、Symanzik和Zimmermann的公理化表述。研究了与四点弹性振幅相关的因果函数、滞后函数和超前函数的解析性质。在高维场论中得到了类似的Lehmann-Jost-Dyson表示。利用广义J-L-D表示导出了振幅的t平面解析性质。证明了一个类似于莱曼椭圆的椭圆的存在。因此,固定t色散关系可以写下来,由于振幅的temperedness有限数量的减法。通过施加么正性约束,扩展了散射振幅在$s$和$t$变量中的解析性域。马丁定理的一个推广版本,以证明在D-维场论这样的区域的存在性。它表明,振幅可以展开的幂级数在t收敛的|t| <R; R是s-独立的。导出了吸收振幅的正性性质,证明了振幅的$t$平面解析性。在扩展的解析域色散关系写两个减法。总截面上的界是从LSZ公理导出的,没有任何额外的特别假设。

英文摘要:

The properties of the high energy behavior of the scattering amplitude of massive, neutral and spinless particles in higher dimensional field theories are investigated. The axiomatic formulation of Lehmann, Symanzik and Zimmermann is adopted. The analyticity properties of the causal, the retarded and the advanced functions associated with the four point elastic amplitudes are studied. The analog of the Lehmann-Jost-Dyson representation is obtained in higher dimensional field theories. The generalized J-L-D representation is utilized to derive the t-plane analyticity property of the amplitude. The existence of an ellipse analogous to the Lehmann ellipse is demonstrated. Thus a fixed-t dispersion relation can be written down with finite number of subtractions due to the temperedness of the amplitudes. The domain of analyticity of scattering amplitude in $s$ and $t$ variables is extended by imposing unitarity constraints. A generalized version of Martin's theorem is derived to prove the existence of such a domain in D-dimensional field theories. It is shown that the amplitude can be expanded in a power series in t which converges for |t|<R; R being s-independent. The positivity properties of absorptive amplitudes are derived to prove the $t$-plane analyticity of amplitude. In the extended analyticity domain dispersion relations are written with two subtractions. The bound on the total cross section is derived from LSZ axioms without any extra ad hoc assumptions.

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