Higgs Boson Decays into Single Photon plus Unparticle

Understand

The decay of the standard model Higgs boson into a single photon and a vector unparticle through a one-loop process is studied.

• For an intermediate mass Higgs boson, this single photon plus unparticle mode can have a branching ratio comparable with the two-photon discovery mode.
• The emitted photon has a continuous energy spectrum encoding the nature of the recoil unparticle.
• It can be measured in precision studies of the Higgs boson after its discovery.