Search for Rare Decays of D s + to Final States π + e + e − , ρ + e + e − , π + π 0 e + e − , K + π 0 e + e − , and K S 0 π + e + e −

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doi:10.1103/PhysRevLett.133.121801

Title: Search for Rare Decays of $D_{s}^{+}$ to Final States $π^{+} e^{+} e^{-}$ , $ρ^{+} e^{+} e^{-}$ , $π^{+} π^{0} e^{+} e^{-}$ , $K^{+} π^{0} e^{+} e^{-}$ , and $K_{S}^{0} π^{+} e^{+} e^{-}$

Journal Article · 17 September 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.133.121801 · OSTI ID:2446758

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

Using $7.33 {fb}^{- 1}$ of $e^{+} e^{-}$ collision data collected by the BESIII detector at center-of-mass energies in the range of $\sqrt{s} = 4.128 - 4.226 GeV$ , we search for the rare decays $D_{s}^{+} \to h^{+} (h^{0}) e^{+} e^{-}$ , where $h$ represents a kaon or pion. By requiring the $e^{+} e^{-}$ invariant mass to be consistent with a $ϕ (1020)$ , $0.98 < M (e^{+} e^{-}) < 1.04 GeV / c^{2}$ , the decay $D_{s}^{+} \to π^{+} ϕ$ , $ϕ \to e^{+} e^{-}$ is observed with a statistical significance of $7.8 σ$ , and evidence for the decay $D_{s}^{+} \to ρ^{+} ϕ$ , $ϕ \to e^{+} e^{-}$ is found for the first time with a statistical significance of $4.4 σ$ . The decay branching fractions are measured to be $B (D_{s}^{+} \to π^{+} ϕ, ϕ \to e^{+} e^{-}) = (1.1 7_{- 0.21}^{+ 0.23} \pm 0.03) \times 10^{- 5}$ , and $B (D_{s}^{+} \to ρ^{+} ϕ, ϕ \to e^{+} e^{-}) = (2.4 4_{- 0.62}^{+ 0.67} \pm 0.16) \times 10^{- 5}$ , where the first uncertainties are statistical and the second systematic. No significant signals for the three four-body decays of $D_{s}^{+} \to π^{+} π^{0} e^{+} e^{-}$ , $D_{s}^{+} \to K^{+} π^{0} e^{+} e^{-}$ , and $D_{s}^{+} \to K_{S}^{0} π^{+} e^{+} e^{-}$ are observed. For $D_{s}^{+} \to π^{+} π^{0} e^{+} e^{-}$ , the $ϕ$ mass region is vetoed to minimize the long-distance effects. The 90% confidence level upper limits set on the branching fractions of these decays are in the range of $(7.0 - 8.1) \times 10^{- 5}$ . Published by the American Physical Society 2024

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Research Organization:: Indiana Univ., Bloomington, IN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2446758

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 133; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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