Particles Not Formed of Quarks
Particles without any quarks have a baryon number of zero. Such particles include leptons (electron, muon, tau and their neutrinos) and gauge bosons (photon, W and Z bosons and gluons); or the hypothetical graviton.
Read more about this topic: Baryon Number
Famous quotes containing the words particles and/or formed:
“The atoms of Democritus
And Newton’s particles of light
Are sands upon the Red Sea shore,
Where Israel’s tents do shine so bright.”
—William Blake (1757–1827)
“A nose, kind sir! Sure, Mother Nature,
With all her freaks, ne’er formed this feature.
If such were mine, I’d try and trade it,
And swear the gods had never made it.”
—Susanna Moodie (1803–1885)