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First observation of the rare $B^{+}\to D^{+} K^{+} \pi^{-}$ decay

Authors
  • Aaij, R.
  • Amhis, Y.
  • Barsuk, S.
  • Borsato, M.
  • Kochebina, O.
  • Lefrançois, J.
  • Li, Y.
  • Machefert, F.
  • Manca, G.
  • Quagliani, R.
  • Robbe, P.
  • Schune, M-H.
  • Teklishyn, M.
  • Vallier, A.
  • Viaud, B.
  • Wormser, G.
  • Beaucourt, L.
  • Chefdeville, M.
  • Decamp, D.
  • Déléage, N.
  • And 37 more
Publication Date
Mar 03, 2016
Source
HAL-UPMC
Keywords
Language
English
License
Unknown
External links

Abstract

The $B^{+}\to D^{+} K^{+} \pi^{-}$ decay is observed in a data sample corresponding to $3.0\,{\rm fb}^{-1}$ of $pp$ collision data recorded by the LHCb experiment during 2011 and 2012. The signal significance is $8\,\sigma$ and the branching fraction is measured to be ${\cal B}\left(B^{+}\to D^{+} K^{+} \pi^{-}\right) = (5.31 \pm 0.90 \pm 0.48 \pm 0.35)\times 10^{-6}$, where the uncertainties are statistical, systematic and due to the normalisation mode $B^{+}\to D^{-} K^{+} \pi^{+}$, respectively. The Dalitz plot appears to be dominated by broad structures. Angular distributions are exploited to search for quasi-two-body contributions from $B^{+}\to D^{*}_{2}(2460)^{0}K^{+}$ and $B^{+}\to D^{+} K^{*}(892)^{0}$ decays. No significant signals are observed and upper limits are set on their branching fractions.

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