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

Journal Article · Mon Mar 23 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3122193· OSTI ID:21293456

Schildknecht, Dieter ^[1]

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1. Fakultaet fuer Physik, Universitaet Bielefeld, D-33615 Bielefeld (Germany) and Max-Planck Institut fuer Physik (Werner-Heisenberg-Institut) Foehringer Ring 6, D-80805 Muenchen (Germany)

The transverse size of qq-bar fluctuations of a longitudinally polarized photon is reduced relative to the transverse size of qq-bar fluctuations of a transversely polarized photon. This implies a model-independent prediction of the ratio R(W{sup 2},Q{sup 2}){identical_to}{sigma}{sub L}/{sigma}{sub T} = 0.375, or, equivalently, F{sub L}/F{sub 2} = 0.27, for x congruent with Q{sup 2}/W{sup 2}<<1 and Q{sup 2} sufficiently large, while R(W{sup 2},Q{sup 2}) 0.50, if this effect is ignored. Experimental data from HERA confirm the transverse-size reduction.

• OSTI ID: 21293456
• Journal Information: AIP Conference Proceedings, Vol. 1105, Issue 1; Conference: DIFFRACTION 2008: International workshop on diffraction in high energy physics, La Londe-les-Maures (France), 9-14 Sep 2008; Other Information: DOI: 10.1063/1.3122193; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLOR MODEL
COMPTON EFFECT
CROSS SECTIONS
DIPOLES
FLUCTUATIONS
FOUR MOMENTUM TRANSFER
HADRONS
HERA STORAGE RING
PARTICLE KINEMATICS
PHOTONS
POLARIZATION
QUANTUM CHROMODYNAMICS
QUARKS