Units in High Energy Physics

Quantity

High Energy Unit

Value in SI units

Length

1 fm

$10^{-15}$ m

Energy

1 Gev = $10^{9}$ eV

1.602 x $10^{-10}$ J

mass, E/$c^{2}$

1 Gev/$c^{2}$

1.78 x $10^{-27}$ kg

$\hbar$ = $\frac{h}{2\pi}$

6.588 x $10^{-25}$ GeV s

1.055 x $10^{-34}$ J s

c

2.998  x $10^{23}$ fm s^{-1}

2.998 x $10^{8}$ m $s^{-1}$

$\hbar$c

0.1975 GeV fm

3.162 x $10^{-26}$ J m