In a static situation without waves I don't know but recent tank testing showed that in a dynamic situation with waves the mast will help the boat to right itself up faster.
That's really odd, could you give us a link to that paper?
(I hate to mention, but Marchaj's book also references tank tests showing boats are more likely to capsize without
the mast, but he is saying they'll be slower to recover with
the rig because of it's dampening effect.)