Why are vector mesons more massive than pseudoscalar mesons?

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Homework Statement
Why are vector mesons more massive than pseudoscalar mesons? Not any sort of set problem, just reading but I can't find an answer or explanation
Relevant Equations
*
Problem Statement: Why are vector mesons more massive than pseudoscalar mesons? Not any sort of set problem, just reading but I can't find an answer or explanation
Relevant Equations: *

It's going to be something to do with the spin-spin interactions for J=0 and J=1. But then I don't see how to get an answer or explanation out of that.

Many thanks
 
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Please see "Decays of Heavy Vector Mesons into Higgs Particles", Frank Wilczek, Phys. Rev. Lett. 39 (1977) 1304.
 
Do you know where I can get access to this? Maybe an alternative source with similar content?

Currently it's all locked behind subscription journals etc...
 

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