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Title: | Observation of B¯→D(*) π+π−ℓ−ν¯ Decays in e+e− Collisions at the Υ(4S) Resonance |
Author: | Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Partícules (Física nuclear) Mesons (Física nuclear) Particles (Nuclear physics) Mesons (Nuclear physics) |
Issue Date: | 29-Jan-2016 |
Publisher: | American Physical Society |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.116.041801 |
It is part of: | Physical Review Letters, 2016, vol. 116, num. 4, p. 041801-1-041801-7 |
URI: | http://hdl.handle.net/2445/119383 |
Related resource: | https://doi.org/10.1103/PhysRevLett.116.041801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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