Using data samples of (10087 ± 44) × 106 J/ψ events and (2712.4 ± 14.3) × 106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we search for the CP violating decays J/ψ → K0SK0S and ψ(3686) → K0SK0S. No significant signals are observed over the expected background yields. The upper limits on their branching fractions are set as B(J/ψ → K0SK0S) < 4.7 × 10−9 and B(ψ(3686) → K0SK0S) < 1.1 × 10−8 at the 90% confidence level. These results improve the previous limits by a factor of three for J/ψ → K0SK0S and two orders of magnitude for ψ(3686) → K0SK0S.
Search for J/ψ→KS0KS0 and ψ(3686)→KS0KS0
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2025-01-01
Abstract
Using data samples of (10087 ± 44) × 106 J/ψ events and (2712.4 ± 14.3) × 106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we search for the CP violating decays J/ψ → K0SK0S and ψ(3686) → K0SK0S. No significant signals are observed over the expected background yields. The upper limits on their branching fractions are set as B(J/ψ → K0SK0S) < 4.7 × 10−9 and B(ψ(3686) → K0SK0S) < 1.1 × 10−8 at the 90% confidence level. These results improve the previous limits by a factor of three for J/ψ → K0SK0S and two orders of magnitude for ψ(3686) → K0SK0S.File in questo prodotto:
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