From: nospam@de-ster.demon.nl   
      
   Stefan Ram  wrote:   
      
   > ram@zedat.fu-berlin.de (Stefan Ram) wrote or quoted:   
   > >Here, the first term (the one before the minus sign) is the "kinetic   
   > >term", and the second one is the "mass term".   
   >   
   >   BTW: Today, I found out that the whole section "11.7 The Mass   
   >   Term" in "Introduction to Elementary Particles" (1987)   
   >   by D. Griffiths deals with /how to identify the mass term/!   
   >   
   > |Conclusion:  To identify the mass term in a Lagrangian, we   
   > |first locate the ground state [the field configuration for   
   > |which U("phi") is a minimum] and reexpress L as a function of   
   > |the deviation, "eta", from this minimum. Expanding in powers   
   > |of "eta", we obtain the mass from the coefficient of the   
   > |"eta"^2 term.   
   > |   
   > quoted (but converted to ASCII) from "11.7 The Mass Term" in   
   > "Introduction to Elementary Particles" (1987) by D. Griffiths   
      
   Yes, it isn't there, and must be sneaked in,   
      
   Jan   
      
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