TY - JOUR

T1 - Search for Rare Decays of Ds+ to Final States π+e+e−, ρ+e+e−, π+π0e+e−, K+π0e+e−, and KS0π+e+e−

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/9/20

Y1 - 2024/9/20

N2 - 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}^{+}→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}^{+}→π^{+}ϕ, ϕ→e^{+}e^{-} is observed with a statistical significance of 7.8σ, and evidence for the decay D_{s}^{+}→ρ^{+}ϕ, ϕ→e^{+}e^{-} is found for the first time with a statistical significance of 4.4σ. The decay branching fractions are measured to be B(D_{s}^{+}→π^{+}ϕ,ϕ→e^{+}e^{-})=(1.17_{-0.21}^{+0.23}±0.03)×10^{-5}, and B(D_{s}^{+}→ρ^{+}ϕ,ϕ→e^{+}e^{-})=(2.44_{-0.62}^{+0.67}±0.16)×10^{-5}, where the first uncertainties are statistical and the second systematic. No significant signals for the three four-body decays of D_{s}^{+}→π^{+}π^{0}e^{+}e^{-}, D_{s}^{+}→K^{+}π^{0}e^{+}e^{-}, and D_{s}^{+}→K_{S}^{0}π^{+}e^{+}e^{-} are observed. For D_{s}^{+}→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)×10^{-5}.

AB - 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}^{+}→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}^{+}→π^{+}ϕ, ϕ→e^{+}e^{-} is observed with a statistical significance of 7.8σ, and evidence for the decay D_{s}^{+}→ρ^{+}ϕ, ϕ→e^{+}e^{-} is found for the first time with a statistical significance of 4.4σ. The decay branching fractions are measured to be B(D_{s}^{+}→π^{+}ϕ,ϕ→e^{+}e^{-})=(1.17_{-0.21}^{+0.23}±0.03)×10^{-5}, and B(D_{s}^{+}→ρ^{+}ϕ,ϕ→e^{+}e^{-})=(2.44_{-0.62}^{+0.67}±0.16)×10^{-5}, where the first uncertainties are statistical and the second systematic. No significant signals for the three four-body decays of D_{s}^{+}→π^{+}π^{0}e^{+}e^{-}, D_{s}^{+}→K^{+}π^{0}e^{+}e^{-}, and D_{s}^{+}→K_{S}^{0}π^{+}e^{+}e^{-} are observed. For D_{s}^{+}→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)×10^{-5}.

UR - https://pubmed.ncbi.nlm.nih.gov/39373421/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85205116480&origin=inward&txGid=ea3ac8bb1da4a0aed58bd7e785d072a7

UR - https://www.mendeley.com/catalogue/bdb6f405-3813-36c8-b708-dcead2e91ba8/

U2 - 10.1103/PhysRevLett.133.121801

DO - 10.1103/PhysRevLett.133.121801

M3 - Article

C2 - 39373421

VL - 133

SP - 121801

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 12

M1 - 121801

ER -