Absorptive effects and power corrections in low x DGLAP evolution

We address a long standing problem concerning the scale behaviour of parton densities in the low x , low Q 2 domain. We emphasize the important role of absorptive corrections at low x and use knowledge of diffractive deep inelastic scattering to exclude the absorptive effect from conventional deep i...

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Bibliographic Details
Published inThe European physical journal. C, Particles and fields Vol. 79; no. 1; pp. 1 - 8
Main Authors Pelicer, M. R., de Oliveira, E. G., Martin, A. D., Ryskin, M. G.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 2019
Springer
Springer Nature B.V
SpringerOpen
Subjects
Absorptivity
Accounting
Astronomy
Astrophysics and Cosmology
Density
Elementary Particles
Evolution
Freezing
Hadrons
Heavy Ions
Inelastic scattering
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
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Summary:We address a long standing problem concerning the scale behaviour of parton densities in the low x , low Q 2 domain. We emphasize the important role of absorptive corrections at low x and use knowledge of diffractive deep inelastic scattering to exclude the absorptive effect from conventional deep inelastic data. In this way we obtain a significantly different low x behaviour of the gluon density, which is now much better described by linear DGLAP evolution. Accounting also for a second power correction, which arises from the freezing of α s at low Q 2 , leads to an essentially flat behaviour of the low x gluon density.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-018-6515-4