- #1
Safinaz
- 255
- 8
Hi there,
As in Ta-Pei Cheng and Li's book for example the W boson propagator is given by :
## \frac{-i}{k^2-M^2} [g_{\mu\nu}+ (\zeta-1) k_\mu k_\nu/(k^2 - \zeta M^2)] ##
At the unitary gauge ## \zeta = \infty ##, where the W propagator becomes :
## \frac{-i}{k^2-M^2} [g_{\mu\nu}- k_\mu k_\nu/ M^2 ] ##
It is not clear for me how when we set ## \zeta ## to ## \infty ##, we got the last formula in the unitary gauge ?
Bests.
As in Ta-Pei Cheng and Li's book for example the W boson propagator is given by :
## \frac{-i}{k^2-M^2} [g_{\mu\nu}+ (\zeta-1) k_\mu k_\nu/(k^2 - \zeta M^2)] ##
At the unitary gauge ## \zeta = \infty ##, where the W propagator becomes :
## \frac{-i}{k^2-M^2} [g_{\mu\nu}- k_\mu k_\nu/ M^2 ] ##
It is not clear for me how when we set ## \zeta ## to ## \infty ##, we got the last formula in the unitary gauge ?
Bests.