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Measurement of branching fraction ratios for B+→D∗+D−K+B^+\to D^{*+}D^-K^+, B+→D∗−D+K+B^+\to D^{*-}D^+K^+, and B0→D∗−D0K+B^0\to D^{*-}D^0K^+decays

Collaboration
May 20, 2020
22 pages
Published in:
  • JHEP 12 (2020) 139
  • Published: Dec 21, 2020
e-Print:
DOI:
Report number:
  • LHCb-PAPER-2020-006,
  • CERN-EP-2020-056
Experiments:
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202020212022202320243210
Abstract: (Springer)
A measurement of four branching-fraction ratios for three-body decays of B mesons involving two open-charm hadrons in the final state is presented. Run 1 and Run 2 pp collision data are used, recorded by the LHCb experiment at centre-of-mass energies 7, 8, and 13 TeV and corresponding to an integrated luminosity of 9 fb−1^{−1}. The measured branching-fraction ratios areB(B+→D∗+D−K+)B(B+→D‾0D0K+)=0.517±0.015±0.013±0.011,B(B+→D∗−D+K+)B(B+→D‾0D0K+)=0.577±0.016±0.013±0.013,B(B0→D∗−D0K+)B(B0→D−D0K+)=1.754±0.028±0.016±0.035,B(B+→D∗+D−K+)B(B+→D∗−D+K+)=0.907±0.033±0.014, {\displaystyle \begin{array}{c}\frac{\mathcal{B}\left({B}^{+}\to {D}^{\ast +}{D}^{-}{K}^{+}\right)}{\mathcal{B}\left({B}^{+}\to {\overline{D}}^0{D}^0{K}^{+}\right)}=0.517\pm 0.015\pm 0.013\pm 0.011,\\ {}\frac{\mathcal{B}\left({B}^{+}\to {D}^{\ast -}{D}^{+}{K}^{+}\right)}{\mathcal{B}\left({B}^{+}\to {\overline{D}}^0{D}^0{K}^{+}\right)}=0.577\pm 0.016\pm 0.013\pm 0.013,\\ {}\begin{array}{c}\frac{\mathcal{B}\left({B}^0\to {D}^{\ast -}{D}^0{K}^{+}\right)}{\mathcal{B}\left({B}^0\to {D}^{-}{D}^0{K}^{+}\right)}=1.754\pm 0.028\pm 0.016\pm 0.035,\\ {}\frac{\mathcal{B}\left({B}^{+}\to {D}^{\ast +}{D}^{-}{K}^{+}\right)}{\mathcal{B}\left({B}^{+}\to {D}^{\ast -}{D}^{+}{K}^{+}\right)}=0.907\pm 0.033\pm 0.014,\end{array}\end{array}} where the first of the uncertainties is statistical, the second systematic, and the third is due to the uncertainties on the D-meson branching fractions. These are the most accurate measurements of these ratios to date.[graphic not available: see fulltext]
Note:
  • B physics
  • Branching fraction
  • Flavor physics
  • Hadron-Hadron scattering (experiments)
  • p p: colliding beams
  • B+: hadronic decay
  • D*(2010)
  • D
  • K
  • B+: branching ratio
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