Particles

Mass (MeV/c²)

Charge

Decays

Structure

K ± baryons

493.8

±e

K± → π± π0 [3] [27] [28]

K0 baryon

497.8

0

K0 → (a) 2π; (b) 3π;

et al. [3] [27]

η baryon

548.8

0

Η → (a) 3π0; (b) π0 π+ π-;

et al. [3] [29] [30]

Charm quark±

1275

±e

D0 → (a) K- π0 π+; (b) K-π+ π+ π-; et al. [3] [31]

Bottom quark±

4180

±e

b± → c± lν; et al. [3] [32]