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Physics Opportunities at a Photon-Photon Collider | | Stanley J. Brodsky
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17 Apr 2002 | | Journal: | Int.J.Mod.Phys. A18 (2003) 2871-2892 | | Subject: | hep-ph | | Affiliation: | SLAC | | 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 $gamma gamma o W^+ W^-$, $gamma gamma o $ Higgs bosons, and higher-order loop processes, such as $gamma gamma o gamma gamma, Z gamma, H^0 Z^0$ and $Z Z.$ 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 $W W$ 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. | | Source: | arXiv, hep-ph/0204197 | | Services: | Forum | Review | PDF | Favorites | |
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