Observation of [bar over B] → D[superscript (*)]π[superscript +]π[superscript −]ℓ[superscript −][bar over ν] Decays in e[superscript +]e[superscript −] Collisions at the Υ(4S) Resonance
Name
PhysRevLett.116.041801.pdf
Size
409.84 KB
Format
Adobe PDF
Checksum (MD5)
2afff5eeffe20ed917e91fc792dac0c5
Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Stugu, B.
Brown, D. N.
Kerth, L. T.
Kolomensky, Yu. G.
Date Issued
January 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, B. Stugu, et al. “Observation of [bar over B] → D[superscript (*)]π[superscript +]π[superscript −]ℓ[superscript −][bar over ν] Decays in e[superscript +]e[superscript −] Collisions at the Υ(4S) Resonance.” Physical Review Letters 116, no. 4 (January 26, 2016). © 2016 American Physical Society
Version
Final published version
Abstract
We report on measurements of the decays of [bar over B] mesons into the semileptonic final states [bar over B] → D[superscript (*)]π[superscript +]π[superscript -]ℓ[superscript -][bar over ν], where D[superscript (*)] represents a D or D[superscript *] meson and ℓ[superscript -] is an electron or a muon. These measurements are based on 471 × 10[superscript 6] B[bar over B] pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R[(*) over π[superscript +]π[superscript -]] = B([bar over B] → D[superscript (*)]π[superscript +]π[superscript -]ℓ[superscript -][bar over ν])/B([bar over B] → D[superscript (*)]ℓ[superscript -][bar over ν]) using events in which the second B meson is fully reconstructed. We find R[subscript π[superscript +]π[superscript -]] = 0.067 ± 0.010 ± 0.008 and R[* over π[superscript +]π[superscript -]] = 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 [bar over B] → D[superscript (*)]ππℓ[superscript -][bar over ν] decays, where π denotes either a π[superscript ±] and π[superscript 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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.116.041801
