can a "low straight flush" hand beat "4 aces" in poker?

ANY straight flush beats 4-of-a-kind in Poker, regardless of what the "high card" in the hand is.

In your example, Player A (w/ the Straight Flush) beats Player B (w/ 4-of-a-kind), even though Player B has all aces.

The only time the "high card" comes into play if both players have the same type of hand.

> If Player A has 4 Jacks to Player B's 4 Aces, Player B would win on the high card (J vs A).

> If Player A has 7-High Straight Flush (7-6-5-4-3) to Player B's 10-High Straight Flush (10-9-8-7-6), Player B would win on the high card (7 vs 10).

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No, the higher cards are better.  Basically whoever has the most aces wins, then kings, queens, etc.  Except for if you have 2 or more deuces.  Deuces never loses.

Player A would most certainly win since straight flush ranks higher than Four of a Kind.

A high straight flush beats a low straight flush.

But even the lowest possible straight flush still beats everything else.

A straight beats four of a kind.  A straight flush beats everything, but a higher straight flush.