Bill_K said:At tree level I'd say there's just one. In the crossed channel: νe + W- → e- → νe + W-
Neutrino scattering is a fundamental process in particle physics where a neutrino interacts with a target particle, such as an electron or a nucleus, and produces a new set of particles.
Feynman diagrams, also known as F. diagrams, are graphical representations of particle interactions in quantum field theory. They are used to calculate the probability of a particular interaction occurring.
The "1st order" in neutrino scattering refers to the level of complexity in the Feynman diagram. In 1st order diagrams, there is only one interaction between the neutrino and the target particle.
F. diagrams provide a visual representation of complex mathematical equations, making it easier to understand and calculate the probability of neutrino interactions. They also allow scientists to make predictions about the behavior of particles during scattering processes.
Neutrinos are some of the most abundant particles in the universe, but they are also some of the least understood. Studying neutrino scattering can provide insight into the properties and behavior of neutrinos, which in turn can help us better understand the structure and evolution of the universe.