A sigma PARTICLE.
The Big Bang Theory Season 1, Episode 13
"Higgs boson PARTICLE."
How could you not get that?
The Big Bang Theory Season 3, Episode 13
to isolate the Higgs
boson PARTICLE.
The Big Bang Theory Season 5, Episode 4
Here's where we derived the mass
of the dark-matter PARTICLE.
The Big Bang Theory Season 3, Episode 4
of the Higgs boson PARTICLE,
and you said,
The Big Bang Theory Season 5, Episode 21