
...of a subatomic PARTICLE
called the Higgs boson.
The Big Bang Theory Season 6, Episode 3

But Penny has no interest
in subatomic PARTICLE research.
The Big Bang Theory Season 3, Episode 15

Here, we have a highly gifted researcher
in the field of PARTICLE physics...
The Big Bang Theory Season 3, Episode 15

You'd be surprised how many
PARTICLE physicists have a whimsical side.
The Big Bang Theory Season 2, Episode 13

of the Higgs boson PARTICLE,
and you said,
The Big Bang Theory Season 5, Episode 21