@article{0311e5b90d54469887c80d7143d14316,
title = "Observation of B ¯ →d (∗) π+π- ν ¯ Decays in e+e- Collisions at the Υ (4S) Resonance",
abstract = "We report on measurements of the decays of B¯ mesons into the semileptonic final states B¯→D(∗)π+π-ν¯, where D(∗) represents a D or D∗ meson and - is an electron or a muon. These measurements are based on 471×106 BB¯ pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios Rπ+π-(∗)=B(B¯→D(∗)π+π-ν¯)/B(B¯→D(∗)-ν¯) using events in which the second B meson is fully reconstructed. We find Rπ+π-=0.067±0.010±0.008 and Rπ+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(∗)ππ-ν¯ 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.",
author = "Lees, {J. P.} and V. Poireau and V. Tisserand and E. Grauges and A. Palano and G. Eigen and B. Stugu and Brown, {D. N.} and Kerth, {L. T.} and Kolomensky, {Yu G.} and Lee, {M. J.} and G. Lynch and H. Koch and T. Schroeder and C. Hearty and Mattison, {T. S.} and McKenna, {J. A.} and So, {R. Y.} and A. Khan and Blinov, {V. E.} and Buzykaev, {A. R.} and Druzhinin, {V. P.} and Golubev, {V. B.} and Kravchenko, {E. A.} and Onuchin, {A. P.} and Serednyakov, {S. I.} and Skovpen, {Yu I.} and Solodov, {E. P.} and Todyshev, {K. Yu} and Lankford, {A. J.} and Gary, {J. W.} and O. Long and {Franco Sevilla}, M. and Hong, {T. M.} and D. Kovalskyi and Richman, {J. D.} and West, {C. A.} and Eisner, {A. M.} and Lockman, {W. S.} and {Panduro Vazquez}, W. and Schumm, {B. A.} and A. Seiden and Chao, {D. S.} and Cheng, {C. H.} and B. Echenard and Flood, {K. T.} and Hitlin, {D. G.} and J. Kim and Miyashita, {T. S.} and A. Soffer",
note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",
year = "2016",
month = jan,
day = "26",
doi = "https://doi.org/10.1103/PhysRevLett.116.041801",
language = "الإنجليزيّة",
volume = "116",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Institute of Physics",
number = "4",
}