TY - JOUR
T1 - Future small x physics with ep and eA colliders
AU - Frankfurt, L.
AU - Strikman, M.
N1 - Funding Information:
HERA has producede xcitingg limpseso f new smallx strongi nteractiognl uond ynamicsT. he aim now is to producea definitivep roofa ndob-serveh ighd ensityh ardQCD. AcknowledgmentOs:n e of us (M.S.) would like to thank DESY for the hospitalityd uring the time this work was done. We thankJ . Bar-tels, J.C. Collins,M . McDermottA, . Mueller,J . Whitmorefo r discussionosf diffractivep henom-ena. This work is supporteidn part by the U.S. Departmenotf Energya ndBSF.
PY - 1999/10
Y1 - 1999/10
N2 - The interaction of spatially small dipoles with nucleons, nuclei is calculated in the DGLAP approximation at the top of HERA energies and found to be close to the S-channel unitarity limit in the case of the color octet dipoles. The DGLAP analyses of the current diffractive data appear to support this conclusion as they indicate a ∼ 30 - 40% probability of the gluon induced diffraction for Q2 ∼ 4 GeV2. The need for the high-precision measurements of the t-dependence of inclusive and exclusive diffraction for pinpointing higher twist effects in the gluon sector is emphasized. The eA collisions at HERA would provide a strong amplification of the gluon densities allowing to reach deep into the regime of nonlinear QCD evolution. Connection between the leading twist nuclear shadowing and leading twist diffraction in ep scattering is explained. The presented model independent results for the nuclear shadowing for light nuclei indicate much larger shadowing for the gluon sector than for the sea quark sector. It is argued that HERA in eA mode would be able to discover a number of new phenomena including large gluon shadowing, large nonlinearities in parton evolution, small x color transparency in the vector meson production followed by color opacity at x ≤ .005, large probability of inclusive diffraction. Implications for the nucleus-nucleus collisions at LHC are discussed as well.
AB - The interaction of spatially small dipoles with nucleons, nuclei is calculated in the DGLAP approximation at the top of HERA energies and found to be close to the S-channel unitarity limit in the case of the color octet dipoles. The DGLAP analyses of the current diffractive data appear to support this conclusion as they indicate a ∼ 30 - 40% probability of the gluon induced diffraction for Q2 ∼ 4 GeV2. The need for the high-precision measurements of the t-dependence of inclusive and exclusive diffraction for pinpointing higher twist effects in the gluon sector is emphasized. The eA collisions at HERA would provide a strong amplification of the gluon densities allowing to reach deep into the regime of nonlinear QCD evolution. Connection between the leading twist nuclear shadowing and leading twist diffraction in ep scattering is explained. The presented model independent results for the nuclear shadowing for light nuclei indicate much larger shadowing for the gluon sector than for the sea quark sector. It is argued that HERA in eA mode would be able to discover a number of new phenomena including large gluon shadowing, large nonlinearities in parton evolution, small x color transparency in the vector meson production followed by color opacity at x ≤ .005, large probability of inclusive diffraction. Implications for the nucleus-nucleus collisions at LHC are discussed as well.
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U2 - 10.1016/S0920-5632(99)00811-7
DO - 10.1016/S0920-5632(99)00811-7
M3 - Article
AN - SCOPUS:0033236055
SN - 0920-5632
VL - 79
SP - 671
EP - 687
JO - Nuclear Physics B - Proceedings Supplements
JF - Nuclear Physics B - Proceedings Supplements
IS - 1-3
ER -