Is it possible to transfer to hardcore league from standard one?

When you start a game you can choose do you want to play in standard or hardcore league. If you choose hardcore and die in there you get transfered to standrard league.

Now my question is, if you start in standard league is there any way to get to the hardcore league with that character, or of course if your character got transfered to standard league because you died with him/her in hardcore is there a way to get back. If you die in hardcore league and get transfered to standard, is your only way back to hardcore making a new character?

I've read on wiki that transfer to standard is permanent, but i just want to make sure that that means there is no way back to hardcore.

No, it wouldn't make any sense since the idea of the hardcore league is that you only have ONE chance/life. Once you get killed, you fall back to "default"/"standard" league.

Hardcore Typically, “hardcore mode” in action RPGs involves permadeath. A character killed in this mode cannot be accessed any more. In Path of Exile, slain hardcore characters revert to the parent non-hardcore league. This system encourages non-hardcore players to try the hardcore game mode, while still permanently removing hardcore characters from the economy when they die.

Source: http://www.pathofexile.com/leagues

"Hardcore" in any kind of roguelike traditionally means "one death". No, there's no way to enter "one death" league after you've been to "more than one death" league simply by their definitions.