An Algorithm for Computing Four-Ramond Vertices at Arbitrary Level
Niclas Engberg, Bengt E. W Nilsson, Per Sundell
Abstract
We perform the sewing of two (dual) Ramond reggeon vertices and derive an algorithm by means of which the so obtained four-Ramond reggeon vertex may be explicitly computed at arbitrary oscillator (mass) level. A closed form of the four-vertex is then deduced on the basis of a comparison to all terms obtained by sewing that contain only level zero and one oscillators. Results are presented for both complex fermions and for the previously studied case of real fermions.
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