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A new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon
New, radiatively generated, LO quark (u,d,s,c,b) and gluon densities in a real, unpolarized photon are presented. We perform a global 3 parameter fit, based on LO DGLAP evolution equations, to all available data for the structure function F2^gamma(x,Q^2). We adopt a new theoretical approach called A...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
2002
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.68.014010 http://cds.cern.ch/record/596343 |
_version_ | 1780899809032404992 |
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author | Cornet, F Jankowski, P Krawczyk, M Lorca, A |
author_facet | Cornet, F Jankowski, P Krawczyk, M Lorca, A |
author_sort | Cornet, F |
collection | CERN |
description | New, radiatively generated, LO quark (u,d,s,c,b) and gluon densities in a real, unpolarized photon are presented. We perform a global 3 parameter fit, based on LO DGLAP evolution equations, to all available data for the structure function F2^gamma(x,Q^2). We adopt a new theoretical approach called ACOT(chi), originally introduced for the proton, to deal with the heavy-quark thresholds. This defines our basic model (CJKL model) which gives a very good description of the experimental data on F2^gamma(x,Q^2), for both Q^2 and x dependences. For comparison we perform a standard fit using the Fixed Flavour-Number Scheme (FFNS_cjkl model), updated with respect to the previous fits of this type. We show the superiority of the CJKL fit over the FFNS_cjkl one and other LO fits to the F2^gamma(x,Q^2) data. The CJKL model gives also the best description of the LEP data on the Q^2 dependence of the F2^gamma$, averaged over various x-regions, and the F_2,c^gamma, which were not used directly in the fit. Finally, a simple analytic parametrization of the resulting parton densities obtained in the CJKL model is given. |
id | cern-596343 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2002 |
record_format | invenio |
spelling | cern-5963432019-09-30T06:29:59Zdoi:10.1103/PhysRevD.68.014010http://cds.cern.ch/record/596343engCornet, FJankowski, PKrawczyk, MLorca, AA new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real PhotonParticle Physics - PhenomenologyNew, radiatively generated, LO quark (u,d,s,c,b) and gluon densities in a real, unpolarized photon are presented. We perform a global 3 parameter fit, based on LO DGLAP evolution equations, to all available data for the structure function F2^gamma(x,Q^2). We adopt a new theoretical approach called ACOT(chi), originally introduced for the proton, to deal with the heavy-quark thresholds. This defines our basic model (CJKL model) which gives a very good description of the experimental data on F2^gamma(x,Q^2), for both Q^2 and x dependences. For comparison we perform a standard fit using the Fixed Flavour-Number Scheme (FFNS_cjkl model), updated with respect to the previous fits of this type. We show the superiority of the CJKL fit over the FFNS_cjkl one and other LO fits to the F2^gamma(x,Q^2) data. The CJKL model gives also the best description of the LEP data on the Q^2 dependence of the F2^gamma$, averaged over various x-regions, and the F_2,c^gamma, which were not used directly in the fit. Finally, a simple analytic parametrization of the resulting parton densities obtained in the CJKL model is given.hep-ph/0212160CERN-TH-2002-362CAFPE-2002-08DESY-02-118DESY-2002-118IFT-2002-22UG-FT-138oai:cds.cern.ch:5963432002-12-11 |
spellingShingle | Particle Physics - Phenomenology Cornet, F Jankowski, P Krawczyk, M Lorca, A A new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon |
title | A new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon |
title_full | A new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon |
title_fullStr | A new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon |
title_full_unstemmed | A new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon |
title_short | A new 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon |
title_sort | new 5 flavour lo analysis and parametrization of parton distributions in the real photon |
topic | Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1103/PhysRevD.68.014010 http://cds.cern.ch/record/596343 |
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