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Observation of B0 → ψ(2S)K0Sπ+π− and B0S → ψ(2S)K0S decaysTumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.Valle, A. Escalante DelFrühwirth, R.Jeitler, M.Krammer, N.Lechner, L.Liko, D.Mikulec, I.Paulitsch, P.Pitters, F.M.Schieck, J.Schöfbeck, R.Schwarz, D.Templ, S.Waltenberger, W.Wulz, C.-E.Chekhovsky, V.Litomin, A.Makarenko, V.Darwish, M.R.De Wolf, E.A.Janssen, T.Kello, T.Lelek, A.Sfar, H. RejebMechelen, P. VanPutte, S. VanRemortel, N. VanBols, E.S.D’Hondt, J.De Moor, A.Delcourt, M.Faham, H. ElLowette, S.Moortgat, S.Morton, A.Müller, D.Sahasransu, A.R.Tavernier, S.Doninck, W. VanVannerom, D.Beghin, D.Bilin, B.Clerbaux, B.Using a data sample of s=13TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103fb-1, the Bs0→ψ(2S)KS0 and B0→ψ(2S)KS0π+π- decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to B(Bs0→ψ(2S)KS0)/B(B0→ψ(2S)KS0)=(3.33±0.69(stat)±0.11(syst)±0.34(fs/fd))×10-2 and B(B0→ψ(2S)KS0π+π-)/B(B0→ψ(2S)KS0)=0.480±0.013(stat)±0.032(syst), where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of Bs0 and B mesons, fs/ fd. © 2022, The Author(s).Springer Science and Business Media Deutschland GmbH2022Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12614https://doi.org/10.1140/epjc/s10052-022-10315-y1434-6044enEuropean Physical Journal Cinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12614