It seems I have a minority opinion here. Hearts support is the best thing that can happen to me. It should be 4+ cards and this support alone makes the N hand a kind of GF opener with > 50 % chance of making game even if partner had promised no points at all. Now add 6 - 7 HCP, I'd find it's definitely an LA to bid 4NT here. Pass may also be an LA but I'd put into question which of the two LAs might more be influenced by the hitch.
I'd also ask about the quality of the partnership. If they were advanced enough to understand 4
♣ or 4
♦ as a cue bid with
♥ support(!), I may say North should have passed but this doesn't seem to be the case because South actually had the ace but failed to bid it.
A2003, on 2017-May-31, 18:19, said:
Can North bid 4NT to ask for ace and sign off at 5 level♥
with one ace and useful Q,
No? Because with one ace and
♥Q the bidding should be beyond 5
♥?
If I'm wrong here, 'no' anyway. If I signed off in 5
♥ opposite an ace and
♥Q, it would mean I bid 4NT just for the rare case that South has both
♣A and
♦A (and not found a way to express supreme support). In that case I would guess raising 4
♥ to 5
♥ via 4NT is not worth the risk. Hearing an ace and
♥Q and then signing off in 5
♥ (if I could) is not an LA to me.