Using a data sample of $$\sqrt{s} =$$ 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103 fb$$^{-1}$$, the B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$ and B$$^0_\mathrm{S}$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}\pi^+\pi^-$$ decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to $$\mathcal{B}$$(B$$^0_\mathrm{S}$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$) / $$\mathcal{B}$$(B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$) = (3.33 $$\pm$$ 0.69 (stat) $$\pm$$ 0.11 (syst) $$\pm$$ 0.34 ($$f_\mathrm{s} / f_\mathrm{d}$$)) $$\times$$ 10$$^{-2}$$ and $$\mathcal{B}$$(B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}\pi^+\pi^-$$) / $$\mathcal{B}$$(B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$) = 0.480 $$\pm$$ 0.013 (stat) $$\pm$$ 0.032 (syst), where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of B$$^0_\mathrm{s}$$ and B$^0$ mesons, $$f_\mathrm{s} / f_\mathrm{d}$$.
Tumasyan, A., et al. "Observation of B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}\pi^+\pi^-$ and B$^0_\mathrm{S}$$\to$$\psi$(2S)K$^0_\mathrm{S}$ decays." European Physical Journal. C, Particles and Fields (Online), vol. 82, no. 5, May. 2022. https://doi.org/10.1140/epjc/s10052-022-10315-y
Tumasyan, A., Adam, W., Andrejkovic, J. W., Bergauer, T., Chatterjee, S., Damanakis, K., Dragicevic, M., Valle, A. Del, Frühwirth, R., Jeitler, M., Krammer, N., Lechner, L., Liko, D., Mikulec, I., Paulitsch, P., Pitters, F. M., Schieck, J., Schöfbeck, R., ... Vetens, W. (2022). Observation of B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}\pi^+\pi^-$ and B$^0_\mathrm{S}$$\to$$\psi$(2S)K$^0_\mathrm{S}$ decays. European Physical Journal. C, Particles and Fields (Online), 82(5). https://doi.org/10.1140/epjc/s10052-022-10315-y
Tumasyan, A., Adam, W., Andrejkovic, J. W., et al., "Observation of B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}\pi^+\pi^-$ and B$^0_\mathrm{S}$$\to$$\psi$(2S)K$^0_\mathrm{S}$ decays," European Physical Journal. C, Particles and Fields (Online) 82, no. 5 (2022), https://doi.org/10.1140/epjc/s10052-022-10315-y
@article{osti_1843253,
author = {Tumasyan, A. and Adam, W. and Andrejkovic, J. W. and Bergauer, T. and Chatterjee, S. and Damanakis, K. and Dragicevic, M. and Valle, A. Del and Frühwirth, R. and Jeitler, M. and others},
title = {Observation of B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}\pi^+\pi^-$ and B$^0_\mathrm{S}$$\to$$\psi$(2S)K$^0_\mathrm{S}$ decays},
annote = {Using a data sample of $\sqrt{s} =$ 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103 fb$^{-1}$, the B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}$ and B$^0_\mathrm{S}$$\to$$\psi$(2S)K$^0_\mathrm{S}\pi^+\pi^-$ decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to $\mathcal{B}$(B$^0_\mathrm{S}$$\to$$\psi$(2S)K$^0_\mathrm{S}$) / $\mathcal{B}$(B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}$) = (3.33 $\pm$ 0.69 (stat) $\pm$ 0.11 (syst) $\pm$ 0.34 ($f_\mathrm{s} / f_\mathrm{d}$)) $\times$ 10$^{-2}$ and $\mathcal{B}$(B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}\pi^+\pi^-$) / $\mathcal{B}$(B$^0$$\to$$\psi$(2S)K$^0_\mathrm{S}$) = 0.480 $\pm$ 0.013 (stat) $\pm$ 0.032 (syst), where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of B$^0_\mathrm{s}$ and B$^0$ mesons, $f_\mathrm{s} / f_\mathrm{d}$.},
doi = {10.1140/epjc/s10052-022-10315-y},
url = {https://www.osti.gov/biblio/1843253},
journal = {European Physical Journal. C, Particles and Fields (Online)},
issn = {ISSN 1434-6052},
number = {5},
volume = {82},
place = {United States},
publisher = {Springer Nature},
year = {2022},
month = {05}}
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
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