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Observation of B_{c}^{+}→D^{0}K^{+} Decays.

R Aaij1, B Adeva2, M Adinolfi3

  • 1European Organization for Nuclear Research (CERN), Geneva, Switzerland.

Physical Review Letters
|April 4, 2017
PubMed

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Summary

Researchers observed the B_{c}^{+}→D^{0}K^{+} decay using LHCb data. This marks the first observation of this type of B_{c}^{+} decay, providing insights into particle physics.

Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Hadron Spectroscopy

Background:

  • The B_{c}^{+} meson is a doubly heavy flavored hadron containing both a charm and a bottom quark.
  • Understanding the decays of B_{c}^{+} mesons provides crucial tests for theoretical models of quark interactions.
  • Previous observations of B_{c}^{+} decays have primarily involved semileptonic or charmless hadronic modes.

Purpose of the Study:

  • To report the first observation of the B_{c}^{+}→D^{0}K^{+} decay.
  • To measure the branching fraction of this decay mode relative to the production rates of B_{c}^{+} and B^{+} mesons.
  • To probe the dynamics of weak annihilation and penguin amplitudes in B_{c}^{+} decays.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7 and 8 TeV.

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  • Integrated luminosity of 3.0 fb^{-1} was utilized for the analysis.
  • Normalization to the well-measured B^{+}→D^{0}π^{+} decay channel to determine the relative production rates and branching fraction.

    • Main Results:

    • The B_{c}^{+}→D^{0}K^{+} decay was observed with a statistical significance of 5.1 standard deviations.
    • The quantity R_{D^{0}K} = (f_{c}/f_{u})×B(B_{c}^{+}→D^{0}K^{+}) was measured to be (9.3_{-2.5}^{+2.8}±0.6)×10^{-7}.
    • This represents the first observation of a B_{c}^{+} decay proceeding predominantly through weak annihilation and penguin amplitudes.

    Conclusions:

    • The observation of B_{c}^{+}→D^{0}K^{+} opens a new window into the study of B_{c}^{+} meson decays.
    • This result provides valuable data for refining theoretical predictions of non-leptonic B_{c}^{+} decay mechanisms.
    • Further studies of this and similar decays will enhance our understanding of fundamental particle interactions.