منابع مشابه
Photon-photon Collisions*
Studies of photon-photon collisions are reviewed with particular emphasis on new results reported to this conference. These include results on light meson spectroscopy and deep inelastic ey scattering. Considerable work has now been accumulated on resonance production by yy collisions. Preliminary high statistics studies of the photon structure function F$(x,Q2) are given and comments are made ...
متن کاملPhoton - Photon Collisions
At this meeting a huge array of new and high quality experimental results for exclusive and inclusive twophoton channels has been reported, both at high and low transverse momentum and at high and low virtual photon mass.2) In many theoretical areas the precision of QCD predictions has now been sharp ened, allowing quantitative meaSures of the running coupling constant, a8(Q2), determinations o...
متن کاملHigher Twist Effects in Photon-photon Collisions
In this article, we investigate the contribution of the high twist Feynman diagrams to the large-pT single pseudoscalar and vector mesons inclusive production cross section in two-photon collisions and we present the general formulae for the high and leading twist differential cross sections. The pion wave function where two non-trivial Gegenbauer coefficients a2 and a4 have been extracted from...
متن کاملAzimuthal correlations in photon-photon collisions.
Using the general helicity formula for γγ collisions, we are showing that it should be possible to determine a number of independent “structure functions”, i.e. linear combinations of elements of the two-photon helicity tensor, through azimuthal correlations in two-body or quasi two-body reactions induced by the photon-photon interaction, provided certain experimental conditions are satisfied. ...
متن کاملHeavy quark production in photon-nucleon and photon-photon collisions
We discuss several mechanisms of heavy quark production in (real) photon-nucleon and (real) photon (real) photon collisions. In particular we focuse on application of the Saturation Model. We discuss how to generalize the formula from virtual photon proton scattering and analyze threshold effects. We discuss a possibility to measure the cross section for γγ → 2c2c̄. In addition to the main dipol...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1994
ISSN: 0033-068X
DOI: 10.1143/ptp.92.175