Third spaghetti model issue: U(1)

Electromagnetism has a U(1) gauge. So has the weak hypercharge. Which U(1) group is the one from the spaghetti model? And what is the other U(1) then?

This is the third problem with the strand model. Here is a summary of the three problems:

1 - Why is the fine structure constant for protons and positrons the same?

2 - Why is the weak mixing angle given both by the mass ratio of the weak bosons and by the ratio of the electromagnetic and weak coupling constants?

3 - What are the two U(1) groups of the standard model, electromagnetism and weak hypercharge, in the spaghetti model?

These three questions must be answered to improve the chances of acceptance of the spaghetti model.