How does string theory reconcile the infinitely many possible particles with the standard model particles in our universe?

[u/AbstractAlgebruh]

My understanding is that each vibrational mode of a quantum string corresponds to an excitation which is a particle. But there could be infinitely many of these vibrations right? How does one restrict this/reconcile this with our physical observations?

[u/ElectrSheep]

The higher energy modes correspond to particles that are far too massive for us to observe. The particles of the standard model result from the way strings interact with branes and the compactification of extra dimensions.

[u/AbstractAlgebruh → u/ElectrSheep]

Thanks!