Measurement of B${}_{\mathrm{c}}$(2S)${}^{+}$ and B${}_{\mathrm{c}}^{\ast }$(2S)${}^{+}$ cross section ratios in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

The ratios of the B${}_{\mathrm{c}}$(2S)${}^{+}$ to B${}_{\mathrm{c}}^{+}$, B${}_{\mathrm{c}}^{\ast }$(2S)${}^{+}$ to B${}_{\mathrm{c}}^{+}$, and B${}_{\mathrm{c}}^{\ast }$(2S)${}^{+}$ to B${}_{\mathrm{c}}$(2S)${}^{+}$ production cross sections are measured in proton-proton collisions at $\sqrt{s}=$ 13 TeV, using a data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 143 fb${}^{-1}$. The three measurements are made in the B${}_{\mathrm{c}}^{+}$ meson phase space region defined by the transverse momentum $p_{\mathrm{T}}$ $>$ 15 GeV and absolute rapidity $|y|$ $<$ 2.4, with the excited B${}_{\mathrm{c}}^{(\ast )}$(2S)${}^{+}$ states reconstructed through the B${}_{\mathrm{c}}^{(\ast )+}{\pi }^{+}{\pi }^{-}$, followed by the B${}_{\mathrm{c}}^{+}$ $\to$ J/$\psi {\pi }^{+}$ and J/$\psi$ $\to$ ${\mu }^{+}{\mu }^{-}$ decays. The B${}_{\mathrm{c}}$(2S)${}^{+}$ to B${}_{\mathrm{c}}^{+}$, B${}_{\mathrm{c}}^{\ast }$(2S)${}^{+}$ to B${}_{\mathrm{c}}^{+}$, and B${}_{\mathrm{c}}^{\ast }$(2S)${}^{+}$ to B${}_{\mathrm{c}}$(2S)${}^{+}$ cross section ratios, including the unknown B${}_{\mathrm{c}}^{(\ast )}$(2S)${}^{+}$ $\to$ B${}_{\mathrm{c}}^{(\ast )+}{\pi }^{+}{\pi }^{-}$ branching fractions, are (3.47 $\pm$ 0.63 (stat) $\pm$ 0.33 (syst))%, (4.69 $\pm$ 0.71 (stat) $\pm$ 0.56 (syst))%, and 1.35 $\pm$ 0.32 (stat) $\pm$ 0.09 (syst), respectively. None of these ratios shows a significant dependence on the $p_{\mathrm{T}}$ or $|y|$ of the B${}_{\mathrm{c}}$ meson. The normalized dipion invariant mass distributions from the decays B${}_{\mathrm{c}}^{(\ast )}$(2S)${}^{+}$ $\to$ B${}_{\mathrm{c}}^{(\ast )}$${}^{+}{\pi }^{+}{\pi }^{-}$ are also reported.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-19-001 (CMS Public Pages)

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• Study of the two-body nonleptonic $B_c(2S)$ weak decays with the QCD factorization approach