Izlaganje sa skupa
Coherence length and nuclear shadowing for transverse and longitudinal photons
Jörg Raufeisen
; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Sažetak
We study nuclear shadowing for transverse and longitudinal photons. The coherence length, which controls the onset of nuclear shadowing at small Bjorken-x, xBj, is longer for longitudinal than for transverse photons. The light-cone Green function technique properly treats the finite coherence length in all multiple scattering terms. This is especially important in the region xBj > 0.01, where most of the data exist. NMC data on shadowing in deep inelastic scattering are well reproduced in this approach. We also incorporate nonperturbative effects, in order to extrapolate this approach to small photon virtualities Q2 , where perturbative QCD cannot be applied. This way, we achieve a description of shadowing that is based only on quark and gluon degrees of freedom, even at low Q2 .
Ključne riječi
nuclear shadowing; photons; light-cone Green function technique; deep inelastic scattering
Hrčak ID:
305628
URI
Datum izdavanja:
1.3.2004.
Posjeta: 419 *