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Observation of an Excited B_{c}^{+} State.

R Aaij1, C Abellán Beteta2, B Adeva3

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Researchers observed a new excited Bc+ state using LHCb experiment data. This finding provides precise mass measurements for Bc+ states, advancing particle physics understanding.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Hadron Spectroscopy

Background:

  • The Bc+ meson is a B-meson containing a charm and an anti-bottom quark.
  • Understanding Bc+ meson excited states is crucial for testing theoretical models of quarkonia.

Purpose of the Study:

  • To report the observation of an excited Bc+ state.
  • To provide precise mass measurements for Bc+ states.

Main Methods:

  • Analysis of pp collision data from the LHCb experiment.
  • Reconstruction of the Bc+π+π- invariant-mass spectrum.
  • Statistical analysis to identify significant peaks.

Main Results:

  • Observation of a significant peak consistent with the B*c(23S1)+ state at 6841.2 MeV/c^2.
  • Evidence for a second state consistent with the Bc(21S0)+ at 6872.1 MeV/c^2.
  • These are the most precise mass measurements for these Bc+ states to date.

Conclusions:

  • The observation of these excited Bc+ states enhances our knowledge of heavy quarkonium spectroscopy.
  • The precise mass measurements offer stringent tests for theoretical predictions.