Name: jose (email_not_shown)
Date: 05/05/10-04:08:23 PM Z

Ussualy one replace the sum over polarization vectors with -g_{\mu \nu} for a massless particle (abelian).

For a particle with mass, \frac{k^{\mu } k^{\nu }}{k^{2}}-g^{\mu \nu }.

How can i get only the transversal polarization? or the longitudinal?

Thanks in advance

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