
#1
Oct1813, 02:10 AM

P: 20

When we derive the BetheSalpeter equation, we have the relations of mass of constitute m, transverse momentum, qhat and energy ω for equal mass constitute as
ω^{2}=m^{2}+(qhat)^{2}. What is the relations of ω,m and qhat for low energy or long distance or low momentum? Can we say qhat≈m? Thank you for taking time to help me! 


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