4,274 research outputs found
Exclusive Rho Rho Production in Tagged Gamma-Gamma Interactions at LEP
Exclusive rho rho production in two-photon collisions between a quasi-real,
gamma, and a virtual, gamma*, photons is studied at LEP at centre-of-mass
energies 89 GeV < sqrt{s} < 209 GeV with a total integrated luminosity of 854.7
pb-1. The cross sections of the gamma gamma* -> rho rho processes are
determined as a function of the photon virtuality, Q^2, and the two-photon
centre-of-mass energy, Wgg, in the kinematic region: 0.2 GeV^2 < Q^2 < 30 GeV^2
and 1.1 GeV < Wgg < 3 GeV.Comment: 4 pages, 2 figures. Talk on XXXXth Rencontres de Moriond, "QCD and
High Energy Hadronic Interactions", La Thuile, Italy, March 12 to 19, 200
Development of hollow electron beams for proton and ion collimation
Magnetically confined hollow electron beams for controlled halo removal in
high-energy colliders such as the Tevatron or the LHC may extend traditional
collimation systems beyond the intensity limits imposed by tolerable material
damage. They may also improve collimation performance by suppressing loss
spikes due to beam jitter and by increasing capture efficiency. A hollow
electron gun was designed and built. Its performance and stability were
measured at the Fermilab test stand. The gun will be installed in one of the
existing Tevatron electron lenses for preliminary tests of the hollow-beam
collimator concept, addressing critical issues such as alignment and
instabilities of the overlapping proton and electron beams.Comment: 3 pp. 1st International Particle Accelerator Conference: IPAC'10,
23-28 May 2010: Kyoto, Japa
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