# Mass changing form

I want to ask whether mass changes to charge or any other form in beta plus decay or minus decay because in beta plus decay up quark changes to down quark with formation of positron and neutrino, here charges are same on both sides but mass on the right hand size increases than left side. So from where that mass comes from? I am confused about it. Please someone explain me how it happens.

• Your question is a little unclear. Could you rewrite it so it is easier to understand? Thanks. – Yejus Oct 4 '20 at 13:14
• well I am saying that in beta plus decay up quark changes to down quark with positron and neutrino. – Susmit Oct 5 '20 at 13:48
• and equation is like [ up quark -----> down quark + positron + neutrino ] here charge is conserved both side because charge of up quark is [2/3e] and charge of down quark is [-1/3e] and charge of positron is [e] and neutrino particle is neutral. But mass is very much high at right side as compared to left side mass of up quark is [2.2MeV/(cc)], mass of down quark is [4.7MeV/(cc)] mass of positron is [0.511MeV/(c*c)] and mass of neutrino is negligible. So, how mass increases in this process. – Susmit Oct 5 '20 at 13:58

• Conversion of mass to and from energy is result of Einstein's $E=mc^2$ equation. – StephenG Oct 5 '20 at 18:00