Articles you may be interested inAtoms in orthogonal electric and magnetic fields: A comparison of quantum and classical models Am.

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We investigate the kinematics of two-particle-to-two-particle scattering for the purpose of Regge crossing. The boundaries of the physical regions for all three channels are given by a single equaUty, jzsl = |z^| = |z«| = 1, which is not the case for two different-mass and four equal-mass processes. In both the s and u physical regions, \zt\ is larger than or equal to 1, and has a maximum whose value increases with increasing energy. At the same time, the position of this maximum approaches the forward direction as the energy increases. (Similar statements can be made about Zs in the t and u channels, and Zu in the s and t channels.) There exist three singular points in either the forward or backward directions for two channels at definite scattering energies for which one of Zg, Zt, or Zu is indeterminate.

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