Proton (a) and D+ particle are built in the same way - with two up quarks and one bottom quark. The only difference is in spin, what causes that D+ particle is 30% heavier than proton.
| a | b |
|
|
|
Proton (uud)
Isospin=1/2
Mass m=938.27231 ±0.00028 MeV (=1836
electron masses* )
Electric momentum D= (-3,7±6,3)x10
-23 e cm
Magnetic momentum m= 2,792847386
±
0,000000066 mB
Lifetime t=1,6x1025 yr (>>age
of the Universe =14,5x109 yr)
Neutron (udd)
Isospin=1/2
Mass m=939.56563 ±0.00028 MeV (a bit
more than proton)
Electric momentum
D< 12x10-26 ecm
Magnetic momentum
m= -1,91304275±0,000000456
mB
Electric charge q=(-0,4±1,1)x10
-21 e (read: zero!)
Lifetime t=888,65 ±
3,5 s (= academic quarter!)
Barion D+(uud)
Isospin=3/2
Mass m=1230-1234 MeV (more or less)
*1831 - beginning of the November Insurection in Poland