If the time interval is short enough
then the force carrying particle can transmute itself into another particle-antiparticle pair.
As you go up in energy, you will be able to see phenomena that happen at shorter distance and in shorter time interval.
Force carrying particles turn into other particle-antiparticle pairs momentarily. Then the number of force carrying particles becomes smaller and the force becomes weaker.
The photons emitted from the electron at times transmute themselves to e+e- pairs momentarily. The probability of this happening is larger as the flight length is longer. The number of force carrying particles thus depends on the distance or equivalently the energy scale.
The effect of gluons' self-duplications dominates the effect of quark-antiquark pairs' reducing the number of gluons and the number of force carrying particles gets larger with distance. Thus the coupling constant becomes larger at lower energies and it becomes infinitely strong eventually (color confinement).
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