Basic features of the pion valence-quark distribution function

The impulse-approximation expression used hitherto to define the pion’s valence-quark distribution function is flawed because it omits contributions from the gluons which bind quarks into the pion. A corrected leading-order expression produces the model-independent result that quarks dressed via the...

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Autores: Chang, L., Mezrag, Cédric, Moutarde, Hervé, Roberts, Craig D., Rodríguez Quintero, José, Tandy, Peter
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:inglés
OAI Identifier:oai:ariasmontano.uhu.es:10272/18417
Acceso en línea:http://hdl.handle.net/10272/18417
Access Level:acceso abierto
Palabra clave:Deep inelastic scattering
Drell–Yan process
Dynamical chiral symmetry breaking
Dyson–Schwinger equations
π-meson
Parton distribution functions
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spelling Basic features of the pion valence-quark distribution functionChang, L.Mezrag, CédricMoutarde, HervéRoberts, Craig D.Rodríguez Quintero, JoséTandy, PeterDeep inelastic scatteringDrell–Yan processDynamical chiral symmetry breakingDyson–Schwinger equationsπ-mesonParton distribution functionsThe impulse-approximation expression used hitherto to define the pion’s valence-quark distribution function is flawed because it omits contributions from the gluons which bind quarks into the pion. A corrected leading-order expression produces the model-independent result that quarks dressed via the rainbow–ladder truncation, or any practical analogue, carry all the pion’s light-front momentum at a characteristic hadronic scale. Corrections to the leading contribution may be divided into two classes, responsible for shifting dressed-quark momentum into glue and sea-quarks. Working with available empirical information, we use an algebraic model to express the principal impact of both classes of corrections. This enables a realistic comparison with experiment that allows us to highlight the basic features of the pion’s measurable valence-quark distribution, qπ (x); namely, at a characteristic hadronic scale, qπ (x) ∼ (1 − x)2 for x 0.85; and the valence-quarks carry approximately two-thirds of the pion’s light-front momentum.Elsevier20142014-08-0120142014-08-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/18417reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/184172026-06-02T14:58:11Z
dc.title.none.fl_str_mv Basic features of the pion valence-quark distribution function
title Basic features of the pion valence-quark distribution function
spellingShingle Basic features of the pion valence-quark distribution function
Chang, L.
Deep inelastic scattering
Drell–Yan process
Dynamical chiral symmetry breaking
Dyson–Schwinger equations
π-meson
Parton distribution functions
title_short Basic features of the pion valence-quark distribution function
title_full Basic features of the pion valence-quark distribution function
title_fullStr Basic features of the pion valence-quark distribution function
title_full_unstemmed Basic features of the pion valence-quark distribution function
title_sort Basic features of the pion valence-quark distribution function
dc.creator.none.fl_str_mv Chang, L.
Mezrag, Cédric
Moutarde, Hervé
Roberts, Craig D.
Rodríguez Quintero, José
Tandy, Peter
author Chang, L.
author_facet Chang, L.
Mezrag, Cédric
Moutarde, Hervé
Roberts, Craig D.
Rodríguez Quintero, José
Tandy, Peter
author_role author
author2 Mezrag, Cédric
Moutarde, Hervé
Roberts, Craig D.
Rodríguez Quintero, José
Tandy, Peter
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Deep inelastic scattering
Drell–Yan process
Dynamical chiral symmetry breaking
Dyson–Schwinger equations
π-meson
Parton distribution functions
topic Deep inelastic scattering
Drell–Yan process
Dynamical chiral symmetry breaking
Dyson–Schwinger equations
π-meson
Parton distribution functions
description The impulse-approximation expression used hitherto to define the pion’s valence-quark distribution function is flawed because it omits contributions from the gluons which bind quarks into the pion. A corrected leading-order expression produces the model-independent result that quarks dressed via the rainbow–ladder truncation, or any practical analogue, carry all the pion’s light-front momentum at a characteristic hadronic scale. Corrections to the leading contribution may be divided into two classes, responsible for shifting dressed-quark momentum into glue and sea-quarks. Working with available empirical information, we use an algebraic model to express the principal impact of both classes of corrections. This enables a realistic comparison with experiment that allows us to highlight the basic features of the pion’s measurable valence-quark distribution, qπ (x); namely, at a characteristic hadronic scale, qπ (x) ∼ (1 − x)2 for x 0.85; and the valence-quarks carry approximately two-thirds of the pion’s light-front momentum.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-08-01
2014
2014-08-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10272/18417
url http://hdl.handle.net/10272/18417
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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