A sigma PARTICLE.
The Big Bang Theory Season 1, Episode 13
to isolate the Higgs
boson PARTICLE.
The Big Bang Theory Season 5, Episode 4
"Higgs boson PARTICLE."
How could you not get that?
The Big Bang Theory Season 3, Episode 13
...of a subatomic PARTICLE
called the Higgs boson.
The Big Bang Theory Season 6, Episode 3
All right, so
this PARTICLE here
The Big Bang Theory Season 5, Episode 21