Using 7.93 fb-1 of e+e- collision data collected at a center-of-mass energy of 3.773 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 parametrization 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±0.013stat±0.003syst.

Study of the light scalar a0(980) through the decay D0 → a0(980)−e+νe with a0(980)− → ηπ−

Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2025-01-01

Abstract

Using 7.93 fb-1 of e+e- collision data collected at a center-of-mass energy of 3.773 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 parametrization 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±0.013stat±0.003syst.
2025
111
9
L091501-1
L091501-10
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.L091501
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.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2119134
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