Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance

We report on measurements of the decays of ¯ B mesons into the semileptonic final states ¯ B → D ( * ) π + π − ℓ − ¯ ν , where D ( * ) represents a D or D ∗ meson and ℓ − is an electron or a muon. These measurements are based on 471 × 10 6 B ¯ B pairs recorded with the BABAR detector at the SLAC asy...

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Detalhes bibliográficos
Autores: Graugés Pous, Eugeni, BABAR Collaboration
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2016
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositório:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/119383
Acesso em linha:https://hdl.handle.net/2445/119383
Access Level:Acceso aberto
Palavra-chave:Partícules (Física nuclear)
Mesons (Física nuclear)
Particles (Nuclear physics)
Mesons (Nuclear physics)
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spelling Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) ResonanceGraugés Pous, EugeniBABAR CollaborationPartícules (Física nuclear)Mesons (Física nuclear)Particles (Nuclear physics)Mesons (Nuclear physics)We report on measurements of the decays of ¯ B mesons into the semileptonic final states ¯ B → D ( * ) π + π − ℓ − ¯ ν , where D ( * ) represents a D or D ∗ meson and ℓ − is an electron or a muon. These measurements are based on 471 × 10 6 B ¯ B pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R ( * ) π + π − = B ( ¯ B → D ( * ) π + π − ℓ − ¯ ν ) / B ( ¯ B → D ( * ) ℓ − ¯ ν ) using events in which the second B meson is fully reconstructed. We find R π + π − = 0.067 ± 0.010 ± 0.008 and R ∗ π + π − = 0.019 ± 0.005 ± 0.004 , where the first uncertainty is statistical and the second is systematic. Based on these results and assuming isospin invariance, we estimate that ¯ B → D ( * ) π π ℓ − ¯ ν decays, where π denotes either a π ± and π 0 meson, account for up to half the difference between the measured inclusive semileptonic branching fraction to charm hadrons and the corresponding sum of previously measured exclusive branching fractions.American Physical Society2018201820162018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion1 p.application/pdfhttps://hdl.handle.net/2445/119383Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.116.041801Physical Review Letters, 2016, vol. 116, num. 4, p. 041801-1-041801-7https://doi.org/10.1103/PhysRevLett.116.041801(c) American Physical Society, 2016info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1193832026-05-29T05:05:01Z
dc.title.none.fl_str_mv Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
title Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
spellingShingle Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
Graugés Pous, Eugeni
Partícules (Física nuclear)
Mesons (Física nuclear)
Particles (Nuclear physics)
Mesons (Nuclear physics)
title_short Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
title_full Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
title_fullStr Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
title_full_unstemmed Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
title_sort Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
dc.creator.none.fl_str_mv Graugés Pous, Eugeni
BABAR Collaboration
author Graugés Pous, Eugeni
author_facet Graugés Pous, Eugeni
BABAR Collaboration
author_role author
author2 BABAR Collaboration
author2_role author
dc.subject.none.fl_str_mv Partícules (Física nuclear)
Mesons (Física nuclear)
Particles (Nuclear physics)
Mesons (Nuclear physics)
topic Partícules (Física nuclear)
Mesons (Física nuclear)
Particles (Nuclear physics)
Mesons (Nuclear physics)
description We report on measurements of the decays of ¯ B mesons into the semileptonic final states ¯ B → D ( * ) π + π − ℓ − ¯ ν , where D ( * ) represents a D or D ∗ meson and ℓ − is an electron or a muon. These measurements are based on 471 × 10 6 B ¯ B pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R ( * ) π + π − = B ( ¯ B → D ( * ) π + π − ℓ − ¯ ν ) / B ( ¯ B → D ( * ) ℓ − ¯ ν ) using events in which the second B meson is fully reconstructed. We find R π + π − = 0.067 ± 0.010 ± 0.008 and R ∗ π + π − = 0.019 ± 0.005 ± 0.004 , where the first uncertainty is statistical and the second is systematic. Based on these results and assuming isospin invariance, we estimate that ¯ B → D ( * ) π π ℓ − ¯ ν decays, where π denotes either a π ± and π 0 meson, account for up to half the difference between the measured inclusive semileptonic branching fraction to charm hadrons and the corresponding sum of previously measured exclusive branching fractions.
publishDate 2016
dc.date.none.fl_str_mv 2016
2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/119383
url https://hdl.handle.net/2445/119383
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.116.041801
Physical Review Letters, 2016, vol. 116, num. 4, p. 041801-1-041801-7
https://doi.org/10.1103/PhysRevLett.116.041801
dc.rights.none.fl_str_mv (c) American Physical Society, 2016
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Physical Society, 2016
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1 p.
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 Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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