fgamma

Fgamma is a term used in several scientific disciplines to denote different concepts, and there is no single, universally accepted definition.

In high-energy physics, F_gamma often refers to a photon-related form factor or structure function used to describe how a photon behaves in hard scattering processes. The photon can fluctuate into quark–antiquark pairs, giving it a hadronic component in certain interactions. The function depends on variables such as the momentum fraction and the momentum transfer, and its form is studied within the framework of quantum chromodynamics. Experimental measurements in electron–positron and electron–proton collisions provide information used to constrain F_gamma.

In mathematics and probability theory, F_gamma may be used as notation for a family of functions indexed by a parameter gamma, or as a kernel or distribution function that varies with gamma. The exact meaning is highly context-dependent and can differ between authors and subfields.

In other contexts, Fgamma can appear as an identifier within software libraries, datasets, or technical documentation. When encountered, the precise definition is typically provided by the source or accompanying literature.

See also: photon structure function, F_2^gamma, gamma distribution, gamma function.