Why do mesons like the J/Psi or Y exist? Shouldn't the quark/anti-quark pair annihilate?
12433
How do $\pi^0$ particles exist?
64088
What does particles with asterisk superscript * mean, such as $Z^*$ or $W^*$, in decay production?
99916
Why Do Glueballs Have Mass, When Individual Gluons Are Massless?
22040
Why is there no theta-angle (topological term) for the weak interactions?
110266
Quarks in a hadron: where does the mass come from?
156543
What is the significance of Lie groups $SO(3)$ and $SU(2)$ to particle physics?
65831
Understanding type of force interaction in particle decays
15027
What are quarks made of?
35409
Massless charged particles
24189
What exactly is a bound state and why does it have negative energy?
29686
Why would Antimatter behave differently via Gravity?
66033
Why must fermions be antisymmetric?
16877
Is there anything smaller than a quark?
62506
Why $SU(3)$ and not $U(3)$?
52423
How big of a neutron star would be needed to form a quark star inside of it?
25257
How to see if certain representation of $SU(2)$ is symmetric/antisymmetric/mixed?
34280
Why does the quarks binding energy add mass to nucleons instead of reducing it?