Veneziano amplitude

The Veneziano amplitude is the tree-level string scattering amplitude for the scattering of four open bosonic strings in their tachyon states. Hence equivalently it is a certain 4-point function in a certain boundary 2d CFT. Historically, this amplitude first arose in dual resonanace models? and the realization that it has a natural interpretation as the scattering of strings was one of the main original motivations for the development of string theory. In p-adic string theory (see there) one...