If bosons are 'virtual' force carrying particles and mesons, made up of quarks which are fermions, are bosons, does this mean that other force carriers such as the photon may be composed of fermions like quarks?

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anonymous · Answer

also what force is associated with mesons

anonymous · Answer

A boson is an elementary particle with a whole number spin (either zero, or one, and some theories suggest there might be bosons with spins of two or more), and that is its most fundamental definition. A meson is a rapidly decaying particle with an integral spin, and hence it is a boson by definition, but that doesn't mean it has a force associated with it. 

The photon and gluon are mass-less, and hence cannot be made up of particles that have mass, namely your quarks. The massive Z and W particles that are the gauge bosons for the week force do have mass, but there is no significant evidence as of yet to suggest they are composed of more elementary constituents.

anonymous · Answer

Bosons can be virtual but are not always. Virtual particles creation is a reaction not having anything to do with composition. Bosons can't be made of fermions because of mass, velocity, and wavefunction.