Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-08-02
J.Phys.G21:1559,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX with equation.sty, 85 pages, 29 figures (not included). A complete PS file of the paper, including figures, can be obtai
Scientific paper
10.1088/0954-3899/21/12/002
We review the present level of knowledge of the hadronic structure of the photon, as revealed in interactions involving quarks and gluons ``in" the photon. The concept of photon structure functions is introduced in the description of deep--inelastic $e \gamma$ scattering, and existing parametrizations of the parton densities in the photon are reviewed. We then turn to hard \gamp\ and \gaga\ collisions, where we treat the production of jets, heavy quarks, hard (direct) photons, \jpsi\ mesons, and lepton pairs. We also comment on issues that go beyond perturbation theory, including recent attempts at a comprehensive description of both hard and soft \gamp\ and \gaga\ interactions. We conclude with a list of open problems.
Drees Manuel
Godbole Rohini M.
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