Massless boson vs massive boson

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hanks721
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Hi, this might sound stupid, but I have a question.
why does massless bosons, such as photon, gluon have an infinite range where w and z bosons have finite ranges??
 
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The strength of a force goes roughly as \frac{e^{-mr}}{r^2} (in units where \hbar = c = 1). You can see that for a massless boson, it's inverse square, and for a massive boson it falls off faster.
 

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