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In the pure scattering theory, the universality of the soft limit has beenstudied for a long time. In this talk we review the property of soft limit torelate an $n$-point amplitude to an $(n-1)$-point amplitude. We show how thisproperty can be used to decompose amplitudes into different complementary softchannel. The existence of such decomposition provides a new way to understandhow to construct amplitude solely from them soft limit.

Scattering amplitude and its soft decomposition