I think "recognised" is the correct term in English, but "accepted" should work too. They do both sound a little weak though. How strong is "connu" in this context. Does it imply any doubt as to the veracity/solidity of the "paramètre"?
I'm not sure,
I'd like to keep the idea that it is a globally "accepted" formula.
Talking of which, can any amazingly intelligent maths buff explain the difference between the English words:
I don't know which one to use (same sentence as above and many others like it!)