2026/03/09 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1123 · 2 voices
#hep-ex
This paper presents a study of the charmless three-body decays B0(s) → KS0 h+ h′ - (where h(′) = π, K), using a sample of pp collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb-1. The decay B0s → KS0 K+ K- is observed for the first time, and the following ratios of branching fractions are measured: 6 \frac\cal B(B0 → K0S K+ K-)\cal B(B0 → K0S π+π-) &= 0.578 &± 0.007 &± 0.017 , \frac\cal B(B0 → K0S K^±π^∓)\cal B(B0 → K0S π+π-) &= 0.1363 &± 0.0035 &± 0.0051 , \frac\cal B(B0s → K0S π+π-)\cal B(B0 → K0S π+π-) &= 0.269 &± 0.011 &± 0.015 & ± 0.008 , \frac\cal B(B0s → K0S K+ K-)\cal B(B0 → K0S π+π-) &= 0.0303 &± 0.0041 &± 0.0025 & ± 0.0009 , \frac\cal B(B0s → K0S K^±π^∓)\cal B(B0 → K0S π+π-) &= 1.818 &± 0.021 &± 0.031 & ± 0.056 , where the uncertainties are statistical, systematic, and due to knowledge of the ratio of hadronisation fractions of the B0s and B0 mesons, respectively.