<P> = 2 GeV </P> <Tr> <Td> m </Td> <Td> Strange quark mass </Td> <Td> μ <P> = 2 GeV </P> </Td> <Td> 87 MeV </Td> </Tr> <P> = 2 GeV </P> <Tr> <Td> m </Td> <Td> Charm quark mass </Td> <Td> μ <P> = m </P> </Td> <Td> 1.32 GeV </Td> </Tr>

In the standard model what is the exchange particle for the weak force