scholarly journals The color dipole picture of low-x DIS

2012 ◽  
Vol 222-224 ◽  
pp. 108-118 ◽  
Author(s):  
Dieter Schildknecht
Keyword(s):  
Color Dipole ◽  
Low X ◽  
Dipole Picture

The color dipole picture

2013 ◽  
Author(s):  
Dieter Schildknecht
Keyword(s):  
Color Dipole ◽  
Dipole Picture

scholarly journals Color transparency and saturation in QCD

2014 ◽  
Vol 29 (25) ◽  
pp. 1430028 ◽  
Author(s):  
Dieter Schildknecht
Keyword(s):  
Scattering Amplitude ◽  
Parton Model ◽  
Theoretical Interpretation ◽  
Inelastic Electron ◽  
Color Transparency ◽  
Color Dipole ◽  
Text Color ◽  
Reaction Channels ◽  
Dipole Picture ◽  
Interaction Channel

We review the theoretical interpretation of deep-inelastic electron–proton scattering at low values of the Bjorken variable x ≃Q2/W2 ≲ 0.1. The process proceeds via the interaction of quark–antiquark [Formula: see text] color-dipole fluctuations of the (virtual) photon with the proton. In terms of the forward Compton scattering amplitude, two reaction channels contribute to the interaction of the [Formula: see text] color dipole with the gluon field in the proton. Dependent on the kinematics, there is either color transparency, corresponding to a cancellation of the amplitudes for the two reaction channels, or saturation, occurring when the process is dominated by a single interaction channel. The connection between the color-dipole picture and the pQCD improved parton model is elaborated upon.

scholarly journals The Color Dipole Picture and the Ratio of the Longitudinal to the Transverse Photoabsorption Cross Section

2009 ◽  
Author(s):  
Dieter Schildknecht ◽  
Roberto Fiore ◽  
Igor Ivanov ◽  
Alessandro Papa ◽  
Jacques Soffer
Keyword(s):  
Cross Section ◽  
Photoabsorption Cross Section ◽  
Color Dipole ◽  
Dipole Picture

scholarly journals SCALING IN γ*p TOTAL CROSS-SECTIONS, SATURATION AND THE GLUON DENSITY

2001 ◽  
Vol 16 (28) ◽  
pp. 1829-1839 ◽  
Author(s):  
DIETER SCHILDKNECHT ◽  
BERND SURROW ◽  
MIKHAIL TENTYUKOV
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Gluon Density ◽  
Hera Data ◽  
Leading Order ◽  
Total Cross Sections ◽  
Vector Dominance ◽  
Color Dipole ◽  
Dipole Picture ◽  
Increasing Function

Including the new HERA data, the γ*p total cross-section is analyzed in the generalized vector dominance/color-dipole picture (GVD/CDP) that contains scaling in [Formula: see text], where Λ2(W2) is an increasing function of W2. At any Q2, for W2→∞, the cross-sections for virtual and real photons become identical, σγ*p (W2,Q2)/σγp (W2)→ 1. The gluon density deduced from the color-dipole cross-section fulfills the leading order DGLAP relationship. Evolution à la DGLAP breaks down for η≲0.1.

scholarly journals Soft diffraction within the QCD color dipole picture

2020 ◽  
Vol 101 (7) ◽  
Author(s):  
G. M. Peccini ◽  
F. Kopp ◽  
M. V. T. Machado ◽  
D. A. Fagundes
Keyword(s):  
Color Dipole ◽  
Dipole Picture

scholarly journals ENERGY DEPENDENCE OF THE POMERON SPIN-FLIP

1998 ◽  
Vol 13 (37) ◽  
pp. 3033-3038 ◽  
Author(s):  
B. Z. KOPELIOVICH ◽  
B. POVH
Keyword(s):  
Energy Dependence ◽  
Proton Structure Function ◽  
Theoretical Reason ◽  
Proton Structure ◽  
Spin Flip ◽  
Color Dipole ◽  
Nuclear Interference ◽  
Low X ◽  
Flip Amplitude ◽  
Coulomb Nuclear Interference

There is no theoretical reason to think that the spin-flip component of the Pomeron is zero. One can measure the spin-flip part using Coulomb-nuclear interference (CNI). Perturbative QCD calculations show that the spin-flip component is sensitive to the smallest quark separation in the proton, while the non-flip part probes the largest separation. According to HERA results on the proton structure function at very low x, the energy dependence of the cross-section correlates with the size of the color dipole. Analyzing the data from HERA we predict that the ratio of the spin-flip to non-flip amplitude grows with energy as r(s)∝(1/x)0.1-0.2, violating Regge factorization of the Pomeron.

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