From: ram@zedat.fu-berlin.de   
      
   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   
      
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