We have. The packet of protons inside LHC, Geneva.
Packets all around the circular tube. Nobody says, they shrink. They say those packets don't qualify for the contraction as they are "not rigid in Born's sens" and therefore not shrinking.
If we can measure even a tinny mass gain, we could measure a tinny contraction.
Had there been any.
They say those packets don't qualify for the contraction as they are "not rigid in Born's sens" and therefore not shrinking.
A bunch of particles not bound to each other by anything is not rigid in any reasonable sense I can think of, so what's your point?
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.