Erratum to M(B*c)―M(Bc) splitting from nonrelativistic renormalization group

The flavor-changing neutral current decay processes of the $B$ and ${B}_{c}$ mesons with the final states involving spin-$1/2$ particles are investigated. By considering the background of the Standard Model, where $\ensuremath{\nu}\overline{\ensuremath{\nu}}$ contributes the missing energy and the experimental upper bounds for the branching fractions, we get the constraints of the coupling constants of the quark-antiquark and the assumed invisible particles $\ensuremath{\chi}\overline{\ensuremath{\chi}}$. The constraints of the coupling constants are then used to study the similar processes of the ${B}_{c}$ meson. At some specific region of ${m}_{\ensuremath{\chi}}$, the upper limit of $\mathrm{BR}({B}_{c}\ensuremath{\rightarrow}{D}_{(s)}\ensuremath{\chi}\overline{\ensuremath{\chi}})$ is of the order of ${10}^{\ensuremath{-}6}$, while for $\mathrm{BR}({B}_{c}\ensuremath{\rightarrow}{D}_{(s)}^{*}\ensuremath{\chi}\overline{\ensuremath{\chi}})$), it is ${10}^{\ensuremath{-}5}$. The possibility of distinguishing $\ensuremath{\chi}$ to be a Majorana or Dirac fermion by the differential branching fractions is also discussed.

Spin- 1 / 2 invisible particles in heavy meson decays

In this paper, we study the FCNC decay processes of B and $$B_c$$
 meson, in which one invisible particle is emitted. Both the spin-0 and spin-1 cases are considered. The model-independent effective Lagrangian is introduced to describe the coupling between the light invisible boson and quarks. The constraints of the coupling coefficients are extracted by experimental upper limits of the missing energy in B meson decays. The bounds are used to predict the upper limits of branching fractions of corresponding $$B_c$$
 decays, which are of the order of $$10^{-6}$$
 or $$10^{-5}$$
 when final meson is pseudoscalar or vector, respectively. The maximum branch ratios are achieved when $$m_\chi \approx 3.5$$
 –4 GeV, where $$m_\chi $$
 is the mass of the invisible particle.

/pdf/the-light-invisible-boson-in-fcnc-decays-of-b-and-b-c-b-c-2gchzgpjhd.pdf

The light invisible boson in FCNC decays of B and $$B_c$$ B c mesons

The Bc± meson has been studied by ATLAS experiment in several exclusive channels containing a J/ψ. ATLAS results on Bc± spectroscopy obtained in LHC runs with the centre of mass beam energies 7 and 8 TeV are presented. The results include observation of the Bc±(2S) state and study of the decays Bc±→J/ψDs(*)±.

/pdf/bc-spectroscopy-results-with-the-atlas-experiment-1idmr2f92e.pdf

Bc± spectroscopy results with the ATLAS experiment

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Bc± spectroscopy results with the ATLAS experiment