2020 Impact factor 4.590
Particles and Fields

Eur. Phys. J. C 18, 723-729
DOI: 10.1007/s100520100560

Resolved $\gamma^*_L$ in hard collisions of virtual photons: QCD effects

J. Chýla and M. Tasevský

Institute of Physics of the Academy of Sciences of the Czech Republic, Na Slovance 2, 180 40 Prague 8, Czech Republic

(Received: 21 October 2000 / Published online: 23 January 2001 -© Springer-Verlag 2001)

The manifestations of QCD effects on quark and gluon distribution functions of longitudinally polarized virtual photons involved in hard collisions are investigated. It is shown that for moderate photon virtualities and in the kinematical region accessible at HERA and LEP these effects are sizable and significantly enhance theoretical predictions based on contributions of transversally polarized virtual photon only.

© Società Italiana di Fisica, Springer-Verlag 2001