According to the Pac-12 notes (prior to the game): “Basically, Arizona State will benefit from a three-team tie, or a two-team tie with Utah.”
The tie-breaker for multiple-team ties:
1. Head-to-head (best record in games among the tied teams)
ASU beat Utah but lost to UCLA.
Utah beat UCLA but lost to ASU.
UCLA beat ASU but lost to Utah.
2. Record in games played within the division
ASU is 3-2 and done with division play.
Utah is 2-2*
UCLA is 2-2* (UCLA eliminated leaving thus going back to head to head between ASU and Utah)
ASU wins the Pac-12 South Division*.
* Only applies if ASU beats CAL, UCLA loses at USC and Utah beats Colorado