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Measurement of the branching fraction ratio $\mathcal{B}(B_c^+ \rightarrow \psi(2S)\pi^+)/\mathcal{B}(B_c^+ \rightarrow J/\psi \pi^+)$

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Abstract

Using $pp$ collision data collected by LHCb at center-of-mass energies $\sqrt{s}$ = 7 TeV and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$, the ratio of the branching fraction of the $B_c^+ \rightarrow \psi(2S)\pi^+$ decay relative to that of the $B_c^+ \rightarrow J/\psi\pi^+$ decay is measured to be 0.268 $\pm$ 0.032 (stat) $\pm$ 0.007 (syst) $\pm$ 0.006 (BF). The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainties on the branching fractions of the $J/\psi \rightarrow \mu^+\mu^-$ and $\psi(2S) \rightarrow \mu^+\mu^-$ decays. This measurement is consistent with the previous LHCb result, and the statistical uncertainty is halved.

Figures and captions

Fit to the reconstructed $ B _ c ^+ $ mass distribution for $ B _ c ^+ \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \pi^+$ using (top) 2011 and (bottom) 2012 data samples. The plots on the left (right) correspond to the data selected with \text{BDT1} (\text{BDT2}). Black points with error bars represent the data, and the various components are indicated in the keys.

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Fit to the reconstructed $ B _ c ^+ $ mass distribution for $ B _ c ^+ \rightarrow \psi {(2S)} \pi^+$ using (top) 2011 and (bottom) 2012 data samples. The plots on the left (right) correspond to the data selected with \text{BDT1} (\text{BDT2}). Black points with error bars represent the data, and the various components are indicated in the keys.

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Tables and captions

Summary of the signal yields and efficiencies for the $ B _ c ^+ \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \pi ^+ $ decay.

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Summary of the signal yields and efficiencies for the $ B _ c ^+ \rightarrow \psi {(2S)} \pi ^+ $ decay.

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Summary of systematic uncertainties on the $ R_{\cal B } $ measurement.

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Supplementary Material [file]

Supplementary material full pdf

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This ZIP file contains supplementary material for the publication LHCb-PAPER-2015-024. The files are: Supplementary.pdf : An overview of the extra figures *.pdf, *.png, *.eps, *.C : The figures in various formats

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Created on 09 December 2018.Citation count from INSPIRE on 18 December 2018.