Abstract
String models were initially invented around 1970 to describe the phenomenology of soft hadronic interactions. They were motivated by the following phenomenological observation, called duality1: in a first approximation, inelastic amplitudes, e.g. п−p → п0n, can be described by either a sum of direct channel resonances (∆, N★, ...) or a sum of crossed-channel Regge poles (ϱ, ϱ′, ...). This approximation, called the narrow resonance approximation, neglects unitarity corrections. Its validity for inelastic amplitudes is of the order of 10%. It is much better than adding the separate contributions of Regge poles and resonances, as naïve field theory would suggest should be done, which would come out wrong by a factor of 2.
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Neveu, A. (1986). Topics in String Theory. In: Velo, G., Wightman, A.S. (eds) Fundamental Problems of Gauge Field Theory. NATO ASI Series, vol 141. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0363-4_2
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DOI: https://doi.org/10.1007/978-1-4757-0363-4_2
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