What is a longitudinally-polarized boson?

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Occassionally, I come across this term: longitudinally-polarized boson. Does it mean that the boson spin is aligned with the x-axis ?
 
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Longitudinal polarization is a relation between spin and momentum.
 
Dick said:
Longitudinal polarization is a relation between spin and momentum.

So, it means the spin and the momentum is aligned the same? Isn't this similar to helicity ?
 
I've always thought of them as the same. Is there a technical difference?
 
Longitudinally polarized means helicity equals zero.
 
Meir Achuz said:
Longitudinally polarized means helicity equals zero.

Thanks, Meir. I thought my memory seemed a little fuzzy on that.
 
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