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 B0 mesons, fs/fd .
Observation of B^0 → ψ (2S)(K_S)^0 π+π- and (B_s)^0 → ψ (2S)(K_S)^0 decays
Cappati, A;Meridiani, P;Amapane, N;Argiro, S;Bellan, R;Bellora, A;Costa, M;Covarelli, R;Grippo, M;Kiani, B;Migliore, E;Monteil, E;Obertino, M M;Pacher, L;Shchelina, K;Siviero, F;Sola, V;Solano, A;Soldi, D;Tornago, M;Vagnerini, A;Rumerio, P;Ravera, F;Salvatico, R;
2022-01-01
Abstract
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 B0 mesons, fs/fd .
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