Table 33.3Quarks and Antiquarks[8]Name Symbol Antiparticle Spin Charge B[9] S c b t
Mass(GeV/c^2 )
[10]Up u u
-
1/2 ±
2
3
qe ±^1
3 0 0 0 0 0.005
Down d d
-
1/2 ∓
1
3
qe ±^1
3 0 0 0 0 0.008
Strange s s
-
1/2 ∓
1
3
qe ±^1
3
∓1 0 0 0 0.50
Charmed c c
-
1/2 ±
2
3
qe ±^1
3 0
±1 0 0 1.6
Bottom b b
-
1/2 ∓
1
3
qe ±^1
3 0 0
∓1 0 5
Top t t
-
1/2 ±
2
3
qe ±^1
3 0 0 0
±1 173
8. The lower of the±symbols are the values for antiquarks.
9. Bis baryon number,Sis strangeness,cis charm,bis bottomness,tis topness.
- Values are approximate, are not directly observable, and vary with model.
1196 CHAPTER 33 | PARTICLE PHYSICS
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