====== TTP99-29 Azimuthal Asymmetries in Hadronic Final States at HERA ======
 
 
   <hidden TTP99-29  Azimuthal Asymmetries in Hadronic Final States at HERA > The distribution of hadrons produced in deeply inelastic electron--proton 
 collisions depends on the azimuthal angle between lepton scattering plane and 
 hadron production plane in the photon-proton centre-of-mass frame. In 
 addition to the well known up-down asymmetry induced by the azimuthal 
 dependence of the Born level subprocess, there is also a non-vanishing 
 left-right asymmetry, provided the incoming electron is polarized. This
 asymmetry is time-reversal-odd and induced by absorptive corrections 
 to the Born level process. We investigate the numerical magnitude of azimuthal 
 asymmetries in semi-inclusive hadron production at HERA with particular 
 emphasis on a possible determination of the time-reversal-odd asymmetry. 
 </hidden>
|**M. Ahmed, T. Gehrmann**  | 
|**  Phys. Lett.  B465 297-302 1999  **  |
| {{preprints:1999:ttp99-29.pdf|PDF}} {{preprints:1999:ttp99-29.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9906503|arXiv]]   |
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