## Only left-handed fermions experience the weak nuclear force

Weak nuclear force is not really a “force.” Weak nuclear “force” facilitates transformations between the first column $\left[ u(L), c(L), t(L) \right]$ and the second column $\left[ d(L), s(L), b(L) \right]$ of quarks, and the first column $\left[ \nu_e (L), \nu_\mu (L), \nu_\tau (L) \right]$ and the second column $\left[ e (L), \mu (L), \tau (L) \right]$ of leptons as shown in the fermion table below.

What this means is that only left-handed fermions experience the weak nuclear force.

All particles in the table below have spin=1/2. The elementary particles with spin=1/2 are known as fermions. This is why the table below is also known as the fermion table.

In the fermion table below the “L” signifies left-handed and “R” right-handed chirality.

Fermion table

$u$ : up-quark
$c$ : charm-quark
$t$ : top-quark
$d$ : down-quark
$s$ : strange-quark
$b$ : bottom-quark
$\nu_e$ : electron type neutrino
$\nu_\mu$ : muon type neutrino
$\nu_\tau$ : tau type neutrino
$e$ : electron
$\mu$ : muon
$\tau$ : tau

Note that there are no right-handed neutrinos.