Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule

We assess the two-photon exchange contribution to the Lamb shift in muonic hydrogen with forward dispersion relations. The subtraction constant (T) over bar (0, Q(2)) that is necessary for a dispersive evaluation of the forward doubly virtual Compton amplitude, through a finite energy sum rule, is r...

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Detalles Bibliográficos
Autores: Llanes Estrada, Felipe José, Gorchtein, Mikhail, Szczepaniak, Adam P
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/33382
Acceso en línea:https://hdl.handle.net/20.500.14352/33382
Access Level:acceso abierto
Palabra clave:53
Compton-Scattering
Proton Structure
Low Q(2)
Atoms
Física (Física)
22 Física
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oai_identifier_str oai:docta.ucm.es:20.500.14352/33382
network_acronym_str ES
network_name_str España
repository_id_str
spelling Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum ruleLlanes Estrada, Felipe JoséGorchtein, MikhailSzczepaniak, Adam P53Compton-ScatteringProton StructureLow Q(2)AtomsFísica (Física)22 FísicaWe assess the two-photon exchange contribution to the Lamb shift in muonic hydrogen with forward dispersion relations. The subtraction constant (T) over bar (0, Q(2)) that is necessary for a dispersive evaluation of the forward doubly virtual Compton amplitude, through a finite energy sum rule, is related to the fixed J = 0 pole generalized to the case of virtual photons. We evaluated this sum rule using excellent virtual photoabsorption data that are available. We find that the "proton polarizability correction" to the Lamb shift in muonic hydrogen is -(40 +/- 5) mu eV. We conclude that nucleon structure-dependent uncertainty by itself is unlikely to resolve the large (300 mu eV) discrepancy between direct measurement of the Lamb shift in mu H and expectations based on conventional hydrogen measurements.American Physical SocietyUniversidad Complutense de Madrid20132013-05-0320132013-05-03journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/33382reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/333822026-06-02T12:44:21Z
dc.title.none.fl_str_mv Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
title Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
spellingShingle Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
Llanes Estrada, Felipe José
53
Compton-Scattering
Proton Structure
Low Q(2)
Atoms
Física (Física)
22 Física
title_short Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
title_full Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
title_fullStr Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
title_full_unstemmed Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
title_sort Muonic-hydrogen Lamb shift: dispersing the nucleon-excitation uncertainty with a finite-energy sum rule
dc.creator.none.fl_str_mv Llanes Estrada, Felipe José
Gorchtein, Mikhail
Szczepaniak, Adam P
author Llanes Estrada, Felipe José
author_facet Llanes Estrada, Felipe José
Gorchtein, Mikhail
Szczepaniak, Adam P
author_role author
author2 Gorchtein, Mikhail
Szczepaniak, Adam P
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 53
Compton-Scattering
Proton Structure
Low Q(2)
Atoms
Física (Física)
22 Física
topic 53
Compton-Scattering
Proton Structure
Low Q(2)
Atoms
Física (Física)
22 Física
description We assess the two-photon exchange contribution to the Lamb shift in muonic hydrogen with forward dispersion relations. The subtraction constant (T) over bar (0, Q(2)) that is necessary for a dispersive evaluation of the forward doubly virtual Compton amplitude, through a finite energy sum rule, is related to the fixed J = 0 pole generalized to the case of virtual photons. We evaluated this sum rule using excellent virtual photoabsorption data that are available. We find that the "proton polarizability correction" to the Lamb shift in muonic hydrogen is -(40 +/- 5) mu eV. We conclude that nucleon structure-dependent uncertainty by itself is unlikely to resolve the large (300 mu eV) discrepancy between direct measurement of the Lamb shift in mu H and expectations based on conventional hydrogen measurements.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-05-03
2013
2013-05-03
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/33382
url https://hdl.handle.net/20.500.14352/33382
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
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869404585254191104
score 15,301603

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