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Figure 30-19 Beta decay of a proton to a neutron can be represented with the quark model: d u W , then W e

Quark model of beta decay The difference between a proton, uud, and a neutron, udd, is only one quark Beta decay in the quark model occurs in two steps, as shown in Figure 30-19 First, one d quark in a neutron changes to a u quark with the emission of a W boson The W boson is one of the three carriers of the weak force In the second step, the W boson decays into an electron and an antineutrino Similarly, in the decay of a proton, a neutron and a W boson are emitted The W boson then decays into a positron and a neutrino The emission of the third weak force carrier, the Z0 boson, is not accompanied by a change from one quark to another The Z0 boson produces an interaction between the nucleons and the electrons in atoms that is similar to, but much weaker than, the electromagnetic force holding the atom together The interaction first was detected in 1979 The W , W , and Z0 bosons first were observed directly in 1983 While neutrinos and antineutrinos have long been thought to be massless, recent experiments that detect neutrinos from the Sun and from distant accelerators show that neutrinos do have mass, although these masses are much smaller than those of any other known particles

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You can see in Figure 30-16 that the quarks and leptons are separated into three families The everyday world is made from particles in the left-hand family: protons, neutrons, and electrons Particles in the middle group are found in cosmic rays and are routinely produced in particle accelerators Particles in the right-hand family are believed to have existed briefly during the earliest moments of the Big Bang and are created in high-energy collisions What determines the masses of the quarks and leptons The Higgs boson, which has been hypothesized as the particle that determines the masses of the leptons and quarks, has not yet been discovered The Standard Model is not a theory; it does not explain the masses of particles, nor why there are three families of quarks and leptons Why are there four forces The differences among the four fundamental interactions are evident: the forces may act on different quantities such as charge or mass, they may have different dependencies on distance, and the force carriers have different properties There are, however, some similarities among the interactions For instance, the force between charged particles, the electromagnetic interaction, is carried by photons in much the same way as weak bosons carry the weak interaction The electric force acts over a long range because the photon has zero mass, while the weak force acts over short distances because the W and Z bosons are relatively massive The mathematical structures of the theories of the weak interaction and electromagnetic interaction, however, are similar

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