η→γγ Decay width via the Primakoff cross section
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevLett.101.012301 http://hdl.handle.net/11449/225216 |
Resumo: | Incoherent η photoproduction in nuclei is evaluated at forward angles within 4 to 9GeV using a multiple scattering MonteCarlo cascade calculation with full η-nucleus final-state interactions. The Primakoff, nuclear coherent and nuclear incoherent components of the cross sections fit remarkably well previous measurements for Be and Cu from Cornell, suggesting a destructive interference between the Coulomb and nuclear coherent amplitudes for Cu. The inelastic background of the data is consistently attributed to the nuclear incoherent part, which is clearly not isotropic as previously considered in Cornell's analysis. The respective Primakoff cross sections from Be and Cu give Γη→γγ=0.476(62)keV, where the quoted error is only statistical. This result is consistent with the Particle Data Group average of 0.510(26)keV and in sharp contrast (∼50%) with the value of 0.324(46)keV obtained at Cornell. © 2008 The American Physical Society. |
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Repositório Institucional da UNESP |
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η→γγ Decay width via the Primakoff cross sectionIncoherent η photoproduction in nuclei is evaluated at forward angles within 4 to 9GeV using a multiple scattering MonteCarlo cascade calculation with full η-nucleus final-state interactions. The Primakoff, nuclear coherent and nuclear incoherent components of the cross sections fit remarkably well previous measurements for Be and Cu from Cornell, suggesting a destructive interference between the Coulomb and nuclear coherent amplitudes for Cu. The inelastic background of the data is consistently attributed to the nuclear incoherent part, which is clearly not isotropic as previously considered in Cornell's analysis. The respective Primakoff cross sections from Be and Cu give Γη→γγ=0.476(62)keV, where the quoted error is only statistical. This result is consistent with the Particle Data Group average of 0.510(26)keV and in sharp contrast (∼50%) with the value of 0.324(46)keV obtained at Cornell. © 2008 The American Physical Society.Physics Institute University of São Paulo, P. O. Box 66318, CEP 05315-970, São PauloFESP-São Paulo Engineering College, São Paulo, 66318Department of Physics and Biophysics UNESP, Botucatu, 66318Center of Applied Studies for Nuclear Developments (CEADEN), Havana, 66318Department of Physics Idaho State University, Pocatello, ID 83209RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198Department of Physics and Biophysics UNESP, Botucatu, 66318Universidade de São Paulo (USP)FESP-São Paulo Engineering CollegeUniversidade Estadual Paulista (UNESP)Center of Applied Studies for Nuclear Developments (CEADEN)Idaho State UniversityRIKENRodrigues, T. E.Arruda-Neto, J. D.T.Mesa, J. [UNESP]Garcia, C.Shtejer, K.Dale, D.Nakagawa, I.Cole, P. L.2022-04-28T20:42:16Z2022-04-28T20:42:16Z2008-07-03info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1103/PhysRevLett.101.012301Physical Review Letters, v. 101, n. 1, 2008.0031-90071079-7114http://hdl.handle.net/11449/22521610.1103/PhysRevLett.101.0123012-s2.0-46949111181Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review Lettersinfo:eu-repo/semantics/openAccess2022-04-28T20:42:17Zoai:repositorio.unesp.br:11449/225216Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:46:10.732118Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
η→γγ Decay width via the Primakoff cross section |
title |
η→γγ Decay width via the Primakoff cross section |
spellingShingle |
η→γγ Decay width via the Primakoff cross section Rodrigues, T. E. |
title_short |
η→γγ Decay width via the Primakoff cross section |
title_full |
η→γγ Decay width via the Primakoff cross section |
title_fullStr |
η→γγ Decay width via the Primakoff cross section |
title_full_unstemmed |
η→γγ Decay width via the Primakoff cross section |
title_sort |
η→γγ Decay width via the Primakoff cross section |
author |
Rodrigues, T. E. |
author_facet |
Rodrigues, T. E. Arruda-Neto, J. D.T. Mesa, J. [UNESP] Garcia, C. Shtejer, K. Dale, D. Nakagawa, I. Cole, P. L. |
author_role |
author |
author2 |
Arruda-Neto, J. D.T. Mesa, J. [UNESP] Garcia, C. Shtejer, K. Dale, D. Nakagawa, I. Cole, P. L. |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) FESP-São Paulo Engineering College Universidade Estadual Paulista (UNESP) Center of Applied Studies for Nuclear Developments (CEADEN) Idaho State University RIKEN |
dc.contributor.author.fl_str_mv |
Rodrigues, T. E. Arruda-Neto, J. D.T. Mesa, J. [UNESP] Garcia, C. Shtejer, K. Dale, D. Nakagawa, I. Cole, P. L. |
description |
Incoherent η photoproduction in nuclei is evaluated at forward angles within 4 to 9GeV using a multiple scattering MonteCarlo cascade calculation with full η-nucleus final-state interactions. The Primakoff, nuclear coherent and nuclear incoherent components of the cross sections fit remarkably well previous measurements for Be and Cu from Cornell, suggesting a destructive interference between the Coulomb and nuclear coherent amplitudes for Cu. The inelastic background of the data is consistently attributed to the nuclear incoherent part, which is clearly not isotropic as previously considered in Cornell's analysis. The respective Primakoff cross sections from Be and Cu give Γη→γγ=0.476(62)keV, where the quoted error is only statistical. This result is consistent with the Particle Data Group average of 0.510(26)keV and in sharp contrast (∼50%) with the value of 0.324(46)keV obtained at Cornell. © 2008 The American Physical Society. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-07-03 2022-04-28T20:42:16Z 2022-04-28T20:42:16Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevLett.101.012301 Physical Review Letters, v. 101, n. 1, 2008. 0031-9007 1079-7114 http://hdl.handle.net/11449/225216 10.1103/PhysRevLett.101.012301 2-s2.0-46949111181 |
url |
http://dx.doi.org/10.1103/PhysRevLett.101.012301 http://hdl.handle.net/11449/225216 |
identifier_str_mv |
Physical Review Letters, v. 101, n. 1, 2008. 0031-9007 1079-7114 10.1103/PhysRevLett.101.012301 2-s2.0-46949111181 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review Letters |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808128233931014144 |