Proton & Co.

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 m_B
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 m_B
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

---