Physics Opportunities at a Photon-Photon Collider

Abstract

The advent of back-scattered laser beams for electron-positron colliders will allow detailed studies of a large array of high energy photon-photon and photon-electron collision processes with polarized beams. These include tests of electroweak theory in photon-photon annihilation such as $\gamma \gamma \to W^{+}{W}^{-}$, $\gamma \gamma \to$ Higgs bosons, and higher-order loop processes, such as $\gamma \gamma \to \gamma \gamma ,Z\gamma ,H^0{Z}^0$ and $ZZ.$ Methods for measuring the anomalous magnetic and quadrupole moments of the $W$ and $Z$ gauge bosons to high precision in polarized electron-photon and photon-photon collisions are discussed. Since each photon can be resolved into a $W^{+}{W}^{-}$ pair, high energy photon-photon collisions can also provide a remarkably background-free laboratory for studying $WW$ collisions and annihilation. I also review high energy $\gamma \gamma$ and $e\gamma$ tests of quantum chromodynamics, including the production of two gluon jets in photon-photon collisions, deeply virtual Compton scattering on a photon target, and leading-twist single-spin asymmetries for a photon polarized normal to a production plane. Exclusive hadron production processes in photon-photon collisions provide important tests of QCD at the amplitude level, particularly as measures of hadron distribution amplitudes which are also important for the analysis of exclusive semi-leptonic and two-body hadronic B-decays.

Invited Talk presented at the 4th International Workshop On Electron-Electron Interactions at TeV Energies (E- E- 01), University of California, Santa Cruz, CA, 7-9 December 2001

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Cited by in corpus (8)

• Single production of new gauge bosons from the littlest Higgs model at the $TeV$ energy $e^{-}\gamma$ colliders
• The lightest Higgs boson production at photon colliders in the 2HDM-III
• Single production of the vector-like top quark in the littlest Higgs model at TeV energy $e^{-}\gamma$ colliders
• High Energy Photon-Photon Collisions at a Linear Collider
• Lepton flavor violating signals of the neutral top-pion in future lepton colliders
• Littlest Higgs model and top-charm production at high-energy linear colliders
• Single production of the gauge boson $W$ via polarized $e^{-}\gamma$ collisions in the littlest Higgs model
• The production of the new gauge boson $B_H$ via $e^{-}\gamma$ collision in the littlest Higgs model