Particle

q(e)

ℓ = 4(3) × L

d_p, s

B_s, B_c

Mass (MeV) Predicted, Observed

N_w

Z

0

21 = 3 × 7

2, (1, 0)

0.92, 1.09

91,400 91,200

8520

W

±1

21 = 3 × 7

2, (1, 0)

0.81, 1.23

80,496 80,400

7501

τ

−1

8 = 4 × 2

1, 1/2

0.84, 1.19

1758 1777

431

µ

−1

4 = 4 × 1

1, 1/2

0.82, 1.22

107 106.6

53

e

−1

1

1, 1/2

1.0, 1.0

0.511 0.511

1