Study of the light scalar a₀(980) through the decay D⁰ → a₀(980)^-e⁺ ν_e with a₀(980)^- → ηπ^-

2024/11/12 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +654
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2411.07730

Abstract

Using 7.93 \rm fb-1 of e+e- collision data collected at a center-of-mass energy of 3.773 \rm GeV with the BESIII detector, we present an analysis of the decay D0 → ηπ- e+ νe. The branching fraction of the decay D0 → a0(980)- e+ νe with a0(980)- → ηπ- is measured to be (0.86±0.17stat±0.05syst)× 10-4. The decay dynamics of this process is studied with a single-pole parameterization of the hadronic form factor and the Flatté formula describing the a0(980) line shape in the differential decay rate. The product of the form factor f a0+(0) and the Cabibbo-Kobayashi-Maskawa matrix element |Vcd| is determined for the first time with the result f a0+(0)|Vcd|=0.126±0.013\rm stat±0.003\rm syst.

Related

• Study of the f₀(980) and f₀(500) Scalar Mesons through the Decay D_s⁺ → π⁺ π^- e⁺ ν_e
• Hadronic decay D⁺→π⁺ηη and the a₀(980) and f₀(1370) contributions
• Observation of D → a₀(980)π in the decays D⁰ → π⁺π^-η and D⁺ → π⁺π⁰η
• Observation of an Altered a₀(980) Line-shape in D⁺ → π⁺ηη due to the Triangle Loop Rescattering Effect
• Role of a₀(980) in the decays D⁰ → K⁺ K^- η and π⁺ π^- η