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Measurement of the ratio of the production cross sections times branching fractions of $B_{c}^{\pm} \to J/\psi \pi^{\pm}$ and $B^{\pm} \to J/\psi K^{\pm}$ and $\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})/\mathcal{B}(B_{c}^{\pm} \to J/\psi \pi^{\pm})$ in pp collisions at $\sqrt{s} =$ 7 TeV

The collaboration
JHEP 1501 (2015) 063, 2015

Abstract (data abstract)
CERN-LHC. The ratio of the production cross sections times branching fractions $\sigma(B_c^{\pm})B(B_c^{\pm} \to J/\psi \pi^{\pm}) /((\sigma(B^{\pm}) B(B^{\pm} \to J/\psi K^{\pm}))$ is studied in proton-proton collisions at a center-of-mass energy of 7 TeV with the CMS detector at the LHC. The kinematic region investigated requires $B_c^{\pm}$ and $B^{\pm}$ mesons with transverse momentum $p_T$ > 15 GeV and rapidity |y| < 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb$^{-1}$. The ratio is determined to be [0.48 $\pm$ 0.05(stat) $\pm$ 0.03(syst) $\pm$ 0.05 ($\tau_{Bc})$]% . The $B_c^{\pm} \to J/\psi \pi^{\pm} \pi^{\pm} \pi^{\mp}$ is also observed in the same data sample. Using a model-independent method developed to measure the efficiency given the presence of resonant behaviour in the three-pion system, the ratio of the branching fractions $B(B_c^{\pm} \to J/\psi \pi^{\pm} \pi^{\pm} \pi^{\mp})/B(B_c^{\pm} \to J/\psi \pi^{\pm})$ is measured to be 2.55 $\pm$ 0.80(stat) $\pm$ 0.33(syst) $\mathrm{^{+ 0.04}_{-0.01} }(\tau_{Bc}$), consistent with the previous LHCb result.

• #### Table 1

Data from Equation 2, Fig.1, Table 1 of the preprint

10.17182/hepdata.39386.v1/t1

The ratio of the production cross sections times branching fractions of $B_c^\pm\to J/\psi\pi^\pm$ and $B^\pm\to J/\psi K^\pm$ is measured in...

• #### Table 2

Data from Equation 5, Figure 2, Figure 3, Table 2 of the preprint

10.17182/hepdata.39386.v1/t2

To determine the systematic uncertainty in the ratio of branching fractions associated with the uncertainty in the $B_c^\pm$ lifetime, the...