Observation of B̅ → D* π⁺π⁻ℓ⁻ν̅ Decays in e⁺e⁻ Collisions at the ϒ(4s) Resonance
| dc.contributor.ORCID | 0000-0003-0867-2189 (Lou, X) | en_US |
| dc.contributor.VIAF | 250674117 (Izen, JM) | en_US |
| dc.contributor.VIAF | 250674117 (Izen, JM) | |
| dc.contributor.author | Lees, J. P. | en_US |
| dc.contributor.author | Poireau, V. | en_US |
| dc.contributor.author | Tisserand, V. | en_US |
| dc.contributor.author | Grauges, E. | en_US |
| dc.contributor.author | Palano, A. | en_US |
| dc.contributor.author | Eigen, G. | en_US |
| dc.contributor.author | Stugu, B. | en_US |
| dc.contributor.author | Izen, Joseph M. | en_US |
| dc.contributor.author | Lou, Xinchou | en_US |
| dc.contributor.author | BaBar Collaboration | en_US |
| dc.contributor.utdAuthor | Lou, Xinchou | en_US |
| dc.contributor.utdAuthor | Izen, Joseph M. | en_US |
| dc.date.accessioned | 2016-09-23T20:40:25Z | |
| dc.date.available | 2016-09-23T20:40:25Z | |
| dc.date.created | 2016-01-26 | en_US |
| dc.date.issued | 2016-01-26 | en_US |
| dc.description.abstract | We report on measurements of the decays of B̅ mesons into the semileptonic final states B̅ → D^{(*)} π⁺π⁻ℓ⁻ν̅, where D^{(*())} represents a D or D* meson and ℓ⁻ is an electron or a muon. These measurements are based on 471 x 10⁶ BB̅ pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R(π⁺π⁻)* = β(B̅ → D* π⁺π⁻ℓ⁻ν̅ /B (B̅ → D*ℓ⁻ν̅) using events in which the second B meson is fully reconstructed. We find Rπ⁺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 B̅ → D^{(*)}ππ ℓ⁻ν̅ decays, where π denotes either a π^± and π⁰ 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. | en_US |
| dc.identifier.bibliographicCitation | Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, et al. 2016. "Observation of B̅ → D^{(*)} π⁺π⁻ℓ⁻ν̅ decays in e⁺e⁻ collisions at the ϒ(4S) resonance." Physical Review Letters 116(4), doi:10.1103/PhysRevLett.116.041801. | en_US |
| dc.identifier.issn | 0031-9007 | en_US |
| dc.identifier.issue | 4 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10735.1/5048 | |
| dc.identifier.volume | 116 | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Amer Physical Soc | en_US |
| dc.relation.uri | http://dx.doi.org/10.1103/PhysRevD.116.041801 | |
| dc.rights | ©2016 American Physical Society | en_US |
| dc.source | Physical Review Letters | |
| dc.subject | B mesons | en_US |
| dc.subject | Branching fractions (Nuclear physics) | en_US |
| dc.subject | Monte Carlo methods | en_US |
| dc.subject | Leptonic decays | en_US |
| dc.subject | Upsilon particles | en_US |
| dc.title | Observation of B̅ → D* π⁺π⁻ℓ⁻ν̅ Decays in e⁺e⁻ Collisions at the ϒ(4s) Resonance | en_US |
| dc.type.genre | Article | en_US |