![]() Intermediary particles are those that transfer energy, momentum, charge, and other properties from one particle to another in association with one of the four fundamental forces.An example of strange particle production is when a negative pion collides with proton, giving rise to a neutral lambda particle and a neutral kaon. For instance, if one particle has strangeness +1 then the other must have strangeness -1. Strange particles are always created in pairs by strong processes in such a way that the total strangeness remains zero. This explains their anomalously long half-lives. However, strangeness is not conserved by weak processes, allowing strange particles to decay via the weak interaction, which indeed is much weaker than the strong interaction at low energies. This is interpreted to mean that such particles possess a property called strangeness that is conserved by strong processes, thus making strange particles stable against strong decay into non-strange particles. Strange particles are baryons and mesons that are unstable, but have much longer half-lives than other particles of similar mass and spin.Mesons are hadrons with integral spin, mainly 0 and 1.The proton and neutron are well known examples. Baryons are hadrons with half-integral spin, mainly 1/2 and 3/2.They are divided into two sub-categories depending on their spin: Hadrons are particles that interact via the strong force.The electron, muon, and the electron and muon neutrinos are examples. Leptons are spin 1/2 particles that do not interact via the strong force.These particles fall into the following categories: The creation of high energy particle accelerators led to the discovery of a plethora of particles in addition to those already known. Before investigating the standard model, we need to describe the state of affairs previous to its development. The standard model of hadrons and leptons is a united set of quantum mechanical theories encompassing electromagnetism the weak force, which is responsible for beta decay and the strong force, which holds atomic nuclei together.
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