Search for B+ → τ+ν

We present a search for the decay B + → τ + ν using 383 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector at the SLAC PEP-II B -Factory. A sample of events with one reconstructed semileptonic B decay ( B − → D 0 ℓ − ¯ ν ℓ X ) is selected, and in the recoil a search fo...

Full description

Bibliographic Details
Authors: Garra Ticó, Jordi, Graugés Pous, Eugeni, BABAR Collaboration
Format: article
Status:Published version
Publication Date:2007
Country:España
Institution:Universidad de Barcelona
Repository:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/131444
Online Access:https://hdl.handle.net/2445/131444
Access Level:Open access
Keyword:Física de partícules
Experiments
Particle physics
id ES_ca6b91deaef231090e79fda1e71ed52b
oai_identifier_str oai:diposit.ub.edu:2445/131444
network_acronym_str ES
network_name_str España
repository_id_str
spelling Search for B+ → τ+νGarra Ticó, JordiGraugés Pous, EugeniBABAR CollaborationFísica de partículesExperimentsParticle physicsExperimentsWe present a search for the decay B + → τ + ν using 383 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector at the SLAC PEP-II B -Factory. A sample of events with one reconstructed semileptonic B decay ( B − → D 0 ℓ − ¯ ν ℓ X ) is selected, and in the recoil a search for B + → τ + ν is performed. The τ is identified in the following channels: τ + → e + ν ¯ ν , τ + → μ + ν ¯ ν , τ + → π + ¯ ν , and τ + → π + π 0 ¯ ν . We measure a branching fraction of B ( B + → τ + ν ) = ( 0.9 ± 0.6 ( stat . ) ± 0.1 ( syst . ) ) × 10 − 4 . In the absence of a significant signal, we calculate an upper limit at the 90% confidence level of B ( B + → τ + ν ) < 1.7 × 10 − 4 . We calculate the product of the B meson decay constant f B and | V ub | to be f B ⋅ | V ub | = ( 7.2 + 2.0 − 2.8 ( stat . ) ± 0.2 ( syst . ) ) × 10 − 4     GeV .American Physical Society2007info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/131444Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1103/PhysRevD.76.052002Physical Review D, 2007, vol. 76, num. 5, p. 052002https://doi.org/10.1103/PhysRevD.76.052002(c) American Physical Society, 2007info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1314442026-05-27T06:46:51Z
dc.title.none.fl_str_mv Search for B+ → τ+ν
title Search for B+ → τ+ν
spellingShingle Search for B+ → τ+ν
Garra Ticó, Jordi
Física de partícules
Experiments
Particle physics
Experiments
title_short Search for B+ → τ+ν
title_full Search for B+ → τ+ν
title_fullStr Search for B+ → τ+ν
title_full_unstemmed Search for B+ → τ+ν
title_sort Search for B+ → τ+ν
dc.creator.none.fl_str_mv Garra Ticó, Jordi
Graugés Pous, Eugeni
BABAR Collaboration
author Garra Ticó, Jordi
author_facet Garra Ticó, Jordi
Graugés Pous, Eugeni
BABAR Collaboration
author_role author
author2 Graugés Pous, Eugeni
BABAR Collaboration
author2_role author
author
dc.subject.none.fl_str_mv Física de partícules
Experiments
Particle physics
Experiments
topic Física de partícules
Experiments
Particle physics
Experiments
description We present a search for the decay B + → τ + ν using 383 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector at the SLAC PEP-II B -Factory. A sample of events with one reconstructed semileptonic B decay ( B − → D 0 ℓ − ¯ ν ℓ X ) is selected, and in the recoil a search for B + → τ + ν is performed. The τ is identified in the following channels: τ + → e + ν ¯ ν , τ + → μ + ν ¯ ν , τ + → π + ¯ ν , and τ + → π + π 0 ¯ ν . We measure a branching fraction of B ( B + → τ + ν ) = ( 0.9 ± 0.6 ( stat . ) ± 0.1 ( syst . ) ) × 10 − 4 . In the absence of a significant signal, we calculate an upper limit at the 90% confidence level of B ( B + → τ + ν ) < 1.7 × 10 − 4 . We calculate the product of the B meson decay constant f B and | V ub | to be f B ⋅ | V ub | = ( 7.2 + 2.0 − 2.8 ( stat . ) ± 0.2 ( syst . ) ) × 10 − 4     GeV .
publishDate 2007
dc.date.none.fl_str_mv 2007
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/2445/131444
url https://hdl.handle.net/2445/131444
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/PhysRevD.76.052002
Physical Review D, 2007, vol. 76, num. 5, p. 052002
https://doi.org/10.1103/PhysRevD.76.052002
dc.rights.none.fl_str_mv (c) American Physical Society, 2007
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Physical Society, 2007
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 Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869419478361571328
score 15,301603

Similar Items