S-matrix or scattering matrix

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==introduction

  • transition amplitude are too hard to calculate from the theory, except in infinite time limits
  • those limits are the entries of the S-matrix
  • typical way to compute S-matrix entries is using correlation functions and Ward identity

 

 

==probability amplitude

  • probability amplitude from initial states to final states
  • Feynman diagram is a tool to compute the probability amplitudes.
    • transition amplitude
    • scattering amplitude 
      • computation of S-matrix (S = Scattering)
      • cross section
  • these are important because they are physically measurable quantity

 

 

==S-matrix

  • functions of complex rapidity difference \theta
  • unitarity
  • crossing-symmetry

 

 

==exact S-matrices

 

 

==bootstrap equations

 

 

==history

 

 

==related items

 

encyclopedia

 

 

==books

 

 

 

==expositions

 

 

articles

 

 

==question and answers(Math Overflow)

 

 

 

==blogs

 

 

==experts on the field

 

 

==links