Probing anomalous quartic $$\gamma \gamma \gamma \gamma $$ couplings in light-by-light collisions at the CLIC

Anomalous Gamma Gamma Interaction

Data from LEP2 on hadron production in γγ interactions at high pT exceed the predictions of QCD by about an order of magnitude. The amplitude for the process is asymptotically proportional to the sum of the squares of the charges of quarks. The data are suggestive of models where quarks have unit charges, or larger. Unequivocal tests could be made with the ILC or CLIC, but a plasma wakefield e−...

An Interaction Region for Gamma-Gamma and Gamma-Electron Collisions at TESLA/SBLC

Linear colliders offer an unique opportunities to study γγ and γe interactions. Using the laser backscattering method one can obtain γγ, γe colliding beams with an energy and luminosity comparable to that in e+e− collisions. This work is part of the Conceptual Design of TESLA/SBLC linear colliders describing a second interaction region for γγ and γe collisions. We consider here possible physics...

New Light on Gamma Oscillations

Two papers in this issue of Neuron by Saleem et al. (2017) and Storchi et al. (2017) show that increases in background light intensity trigger proportional increases in narrowband gamma oscillations with a peak at 60 Hz in retina, lateral geniculate, and primary visual cortex of the mouse visual system.

Scintillators Photomultipliers Crystal Scintillators Photomultipliers Gamma Ray Gamma Ray Scattered : Light Emitted Gamma Ray Absorbed : Light Emitted

Gamma - Gamma , Gamma - Electron Colliders ∗

It is very likely that in 3-4 years the construction of one or two linear colliders with c.m.s energy up to 0.5–1.5 TeV will be started. Besides eecollisions, linear colliders give a unique possibility to study γγ and γe interactions at energies and luminosities comparable to those in ee collisions. High energy photons for γγ and γe collisions can be obtained using laser backscattering. These t...