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On the soft limit of open string amplitudes with massive states | | Massimo Bianchi
; Andrea L. Guerrieri
; | | Date: |
21 May 2015 | | Abstract: | We discuss the soft behaviour of open string amplitudes with gluons and
massive states in any dimension. Notwithstanding non-minimal couplings of
massive higher spin states to gluons, relying on OPE and factorization, we
argue that the leading and sub-leading terms are universal and identical to the
ones in Yang-Mills theories. In order to illustrate this, we compute some
4-point amplitudes on the disk involving gluons, massive states and, for the
bosonic string, tachyons. For the superstring, we revisit the structure of the
massive super-multiplets at the first massive level and rewrite the amplitudes
in D = 4 in the spinor helicity formalism, that we adapt to accommodate massive
higher spin states. We also check the validity of a recently proposed formula
relating open superstring amplitudes for mass-less states at tree-level to SYM
amplitudes, by factorisation on two-particle massive poles. Finally we analyse
the holomorphic soft limit of superstring amplitudes with one massive
insertion. | | Source: | arXiv, 1505.5854 | | Services: | Forum | Review | PDF | Favorites | |
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