this post was submitted on 17 Feb 2026
67 points (98.6% liked)

Science

6765 readers
52 users here now

General discussions about "science" itself

Be sure to also check out these other Fediverse science communities:

https://lemmy.ml/c/science

https://beehaw.org/c/science

founded 3 years ago
MODERATORS
Sal@mander.xyz
fossilesque@mander.xyz
67
Proton's width measured to unparalleled precision, narrowing the path to new physics (phys.org)
submitted 3 days ago by misk@piefed.social to c/science@mander.xyz
7 comments fedilink hide all child comments
 

Source paper: Sub-part-per-trillion test of the Standard Model with atomic hydrogen

you are viewing a single comment's thread
view the rest of the comments
[–] starik@lemmy.zip 20 points 3 days ago (2 children)

r~p~ = 0.8406(15) fm

Saved you a click

[–] christopher@lemmy.ca 4 points 3 days ago (1 children)

I wish I was smart enough to know how small that is

[–] SoleInvictus@lemmy.blahaj.zone 5 points 3 days ago* (last edited 3 days ago) (1 children)

If the average human hair is about 50 billion femtometers wide, it means it takes about 30 billion ~~photons~~ protons lined up side to side to equal that width. So really fucking small.

Edit: swap an r for an h and the meaning changes significantly!

[–] dnick@sh.itjust.works 1 points 3 days ago

Damn scientists and their fancy equipment, my tape measure will barely get down to the 0.8(14) fm range