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Small-x single-particle distributions in jets from the coherent branching formalism
We calculate single parton distributions inside quark and gluon jets within the coherent branching formalism, which resums leading and next-to-leading logarithmic contributions. This formalism is at the basis of the modified leading logarithmic approximation (MLLA), and it conserves energy exactly....
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
2008
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1088/1126-6708/2009/05/023 http://cds.cern.ch/record/1128872 |
_version_ | 1780914887673774080 |
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author | Sapeta, Sebastian Wiedemann, Urs Achim |
author_facet | Sapeta, Sebastian Wiedemann, Urs Achim |
author_sort | Sapeta, Sebastian |
collection | CERN |
description | We calculate single parton distributions inside quark and gluon jets within the coherent branching formalism, which resums leading and next-to-leading logarithmic contributions. This formalism is at the basis of the modified leading logarithmic approximation (MLLA), and it conserves energy exactly. For a wide preasymptotic range of the evolution variable Y=ln[E\theta/Q_0], we find marked differences in the shape and norm of single parton distributions calculated in the MLLA or in the coherent branching formalism, respectively. For asymptotically large values Y>5-10, the difference in norm persists, while differences in shape disappear. In this way, our numerical study delineates the jet energy scale needed for a reliable application of both approaches. We also study the dependence of the single parton distributions on the hadronization scale Q_0 and on \Lambda_QCD, and we calculate within the coherent branching formalism the identified quark and gluon distributions inside quark and gluon jets. |
id | cern-1128872 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2008 |
record_format | invenio |
spelling | cern-11288722019-09-30T06:29:59Zdoi:10.1088/1126-6708/2009/05/023http://cds.cern.ch/record/1128872engSapeta, SebastianWiedemann, Urs AchimSmall-x single-particle distributions in jets from the coherent branching formalismParticle Physics - PhenomenologyWe calculate single parton distributions inside quark and gluon jets within the coherent branching formalism, which resums leading and next-to-leading logarithmic contributions. This formalism is at the basis of the modified leading logarithmic approximation (MLLA), and it conserves energy exactly. For a wide preasymptotic range of the evolution variable Y=ln[E\theta/Q_0], we find marked differences in the shape and norm of single parton distributions calculated in the MLLA or in the coherent branching formalism, respectively. For asymptotically large values Y>5-10, the difference in norm persists, while differences in shape disappear. In this way, our numerical study delineates the jet energy scale needed for a reliable application of both approaches. We also study the dependence of the single parton distributions on the hadronization scale Q_0 and on \Lambda_QCD, and we calculate within the coherent branching formalism the identified quark and gluon distributions inside quark and gluon jets.arXiv:0809.4251CERN-PH-TH-2008-198oai:cds.cern.ch:11288722008-09-25 |
spellingShingle | Particle Physics - Phenomenology Sapeta, Sebastian Wiedemann, Urs Achim Small-x single-particle distributions in jets from the coherent branching formalism |
title | Small-x single-particle distributions in jets from the coherent branching formalism |
title_full | Small-x single-particle distributions in jets from the coherent branching formalism |
title_fullStr | Small-x single-particle distributions in jets from the coherent branching formalism |
title_full_unstemmed | Small-x single-particle distributions in jets from the coherent branching formalism |
title_short | Small-x single-particle distributions in jets from the coherent branching formalism |
title_sort | small-x single-particle distributions in jets from the coherent branching formalism |
topic | Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1088/1126-6708/2009/05/023 http://cds.cern.ch/record/1128872 |
work_keys_str_mv | AT sapetasebastian smallxsingleparticledistributionsinjetsfromthecoherentbranchingformalism AT wiedemannursachim smallxsingleparticledistributionsinjetsfromthecoherentbranchingformalism |