An algorithm for computing four-Ramond vertices at arbitrary level

Niclas Engberg, Bengt E.W. Nilsson, Per Sundell

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)187-214
Number of pages28
JournalNuclear Physics, Section B
Issue number1-2
Publication statusPublished - 30 Aug 1993

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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