Neitrino
Nov18-05, 01:42 AM
Dear PF,
I dont understand something....My question is from dispersion relations for form-factors, namely - what does it mean "one substraction" in dispersion relations. Or forula 19.98 in PS it says it should be massless meson state - why (if form-factor has pole why this corresponds to massless state and how do I identify the property of this massless state? I mean wether it is pseudoscalar or some other state)?
thanks always:smile:
I dont understand something....My question is from dispersion relations for form-factors, namely - what does it mean "one substraction" in dispersion relations. Or forula 19.98 in PS it says it should be massless meson state - why (if form-factor has pole why this corresponds to massless state and how do I identify the property of this massless state? I mean wether it is pseudoscalar or some other state)?
thanks always:smile: