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The graviton is a hypothetical elementary particle that mediates the force of gravitation in the framework of quantum field theory. If it exists, the graviton is expected to be massless and must be a spin-2 boson. The spin follows from the fact that the source of gravitation is the stress–energy tensor, a second-rank tensor. But by no means is it universally accepted.

http://www.fnal.gov/pub/today/archive/archive_2012/today12-10-19_NutshellReadMore.html

But there are many articles about the interaction between Photon and graviton or graviton-photon scattering.

http://journals.aps.org/pr/abstract/10.1103/PhysRev.128.2414

http://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.064008

How can graviton's mystery be solved? Should graviton be detectable or like photon (same as photoelectric effect) be able to explain the physical phenomena?