Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/119383
Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
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.
Matèries (anglès)
Citació
Citació
GRAUGÉS POUS, Eugeni, BABAR Collaboration. Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance. _Physical Review Letters_. 2016. Vol. 116, núm. 4, pàgs. 041801-1-041801-7. [consulta: 20 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/119383]