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| Exchange Particles |
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When
interaction between particles occurs there is a change in the energy state
of each particle eg. one gains energy the other loses it. We know that
mass and energy are interchangeable, we can therefore consider an 'exchange
particle' going from one to the other.
When we detect a particle it interacts with our detector! Therefore if we detected the exchange particle it would not be acting as an exchange particle any more but have come out of the system..that is why we can call exchange particles virtual..if they did more than exchange energy/mass they would not be exchange particles at all. 
The gravitational
force has 'gravitons' as the exchange particles and the weak
nuclear force has 'w-bosons'.
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