# beta decay equation balance

Quark doesn't constitutes more fundamental particle and proton and neutron consist of quarks. Now come to beta decay.

$n \rightarrow p + e^{-} + \bar{\nu}_e$

How can an electron emit from an neutron whereas electron is a fundamental particle? Is the electron created from gluon?

• I've edited you decay equation to more accurately reflect the nature of the neutral lepton. – dmckee --- ex-moderator kitten Jul 25 '13 at 20:43

This is a weak decay and it is mediated by a weak boson. In this case a $W^-$.
• @Raisa : Weak interactions involve left-handed particles. Left Quarks $d$ and $u$ are a SU(2) doublet, that is you have to consider the doublet left $(u,d)$ as a whole, exactly as a vector with $2$ dimensions, and SU(2) operations on this vector are allowed, for instance, a "rotation" could transform $u$ in $d$. Same thing for the doublet electron/ neutrino. – Trimok Jul 26 '13 at 13:03