A high energy photon collider (γγ, γe) based on backward Compton scattering of laser light is a very natural supplement to e+e− a linear collider and can significantly enrich the physics program. The region below about one 0.5–1 TeV is very convenient from a technical point of view: wave length of the laser should be about 1 μm, i.e. in the region of most powerful solid state lasers, collision ...

We determine the relation between photon, cyclotron, collision, and plasma frequencies which ensures a null Faraday rotation for electromagnetic wave propagation in a flee-carrier magnetoplasma. This provides a clean deterinination (in the sense that it is independent of multiple reflections and the length of the plasma along the beam direction) of scattering times and effective masses in MIS a...

The production of hadrons in the collision of two photons via the process1 e+e-f e+e-X (see Fig. 1) can provide an ideal laboratory for testing many of the features of the photon's hadronic interactions, especially its short distance aspects. We will review here that part of two-photon physics which is particularly relevant to tests of perturbative QCD. (Invited talk presented at the 1979 Inter...

Coherent peripheral collisions of atomic nuclei involve electromagnetic or long range hadronic interactions at impact parameters, where both nuclei survive intact. Recently such ultra-peripheral collisions were observed at RHIC. The effect of the electromagnetic field can be interpreted as a photon-photon collision with an effective center of mass energy up to a few GeV at RHIC. At the Large Ha...

The electron pair emission from a W(001) surface was studied using a coincidence time-of-flight spectrometer. The aim of this study was to compare the pair emission upon electron impact and upon photon absorption. The energy distributions are markedly different for these two experiments. From this we conclude that the photon-stimulated pair emission carries a significant contribution from a dou...

It has been recognized that e+epair creation during the collision of intense beams in linear colliders will cause potential background problems for high energy experiments. Detailed knowledge of the angular-momentum spectrum of these low energy pairs is essential to the design of the interaction region. In this paper, we modify the computer code ABEL(Analysis of Beam-beam Effects in Linear coll...

We show that a forward jet with large transverse momentum in an onium-onium collision is a hard probe which can be effectively characterized by a colour-dipole distribution at the time of the interaction. The dipole distribution is computed, and compared to its counterpart for a virtual photon in the initial state. We find that while in the photon case, the tail of large sizes is exponentially ...

A high energy photon collider (γγ, γe) based on backward Compton scattering of laser light is a very natural supplement to e+e− a linear collider and can significantly enrich the physics program. The region below about one 0.5–1 TeV is very convenient from a technical point of view: wave length of the laser should be about 1 μm, i.e. in the region of most powerful solid state lasers, collision ...

It is shown that the radiative electron capture to continuum in energetic collisions with fast heavy projectiles also leads to a binary-encounter type peak in the high-energy electron spectrum. In contrast to the nonradiative target ionization this peak results from a higher-order process, involving near-elastic scattering, and its shape is different from the target Compton profile. Numerical r...

We investigate the security of quantum key distribution with entangled photons, focusing on the two-photon variation of the Bennett-Brassard 1984 ~BB84! protocol proposed in 1992 by Bennett, Brasard, and Mermin ~BBM92!. We present a proof of security which applies to realistic sources, and to untrustable sources which can be placed outside the labs of the two receivers. The proof is restricted ...