Sgamma
Sgamma is a hypothetical particle that is a member of the sigma particle family. It was proposed in the 1960s as part of the early attempts to understand the strong nuclear force, one of the four fundamental forces of nature. The sigma particle family includes the sigma minus (σ−), sigma zero (σ0), and sigma plus (σ+), which are all unstable hadrons composed of a quark and an antiquark.
The Sgamma particle is particularly interesting because it is a member of the hidden-charm family, meaning
Despite its theoretical importance, the Sgamma particle has not been experimentally confirmed. Its existence is inferred
The study of Sgamma and other hidden-charm mesons continues to be an active area of research in