Possible Observation of Photon Speed Energy Dependence

Details Possible Observation of Photon Speed Energy Dependence Possible Observation of Photon Speed Energy Dependence

2003-03-11

arxiv.org/abs/hep-ex/0303010v2

Phys.Lett. B611 (2005) 231-238

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 3 figures

Scientific paper

10.1016/j.physletb.2005.02.053

Current constraints on photon velocity variability are summarized and displayed in terms of an energy dependent vacuum refraction index. It is shown that the energy-momentum balance of high energy Compton scattering is very sensitive to the outgoing photon speed. A missing energy observation in HERA Compton polarimeter data indicates that photons with 12.7 GeV energy are moving faster than light by 5.1(1.4)mm/s. An asymmetry spectrum measured by the SLC longitudinal polarimeter implies however an effect which is 42 times smaller, although the interpretation of the data is less clear here.

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