No, electrons and antineutrinos cannot directly combine to form W bosons. The W bosons are elementary particles that mediate the weak nuclear force, while electrons and antineutrinos are fermions, which are a different class of particles.
The W bosons are created in processes involving the weak interaction, which involves the exchange of W bosons between particles. The most common process for W boson production is the decay of a heavier particle, such as a top quark or a W boson itself.
For example, in the decay of a top quark, one of the possible decay modes is the emission of a W boson, which can then further decay into an electron and an electron neutrino:
t → b + W+ W+ → e+ + νe
Here, the electron and the electron neutrino are produced as separate particles in the decay process involving the W boson.
It's important to note that the weak interaction involves all fermions, including electrons and neutrinos, but the specific combination of particles that leads to the creation of W bosons depends on the processes and interactions involved.