Observation of the decay J/Ψ → e+e-η(1405) with η(1405) → π0f0(980)

Observation of the decay J/Ψ → e+e-η(1405) with η(1405) →†’ π0f0(980)

Ablikim, M. (author): Inst High Energy Phys, Beijing 100049, Peoples R China

Kupsc, Andrzej (author): Uppsala universitet,Kärnfysik,Natl Ctr Nucl Res, PL-02093 Warsaw, Poland

Zu, J. (author): State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China;Univ Sci & Technol China, Hefei 230026, Peoples R China

(creator_code:org_t)

American Physical Society, 2024
2024
English.
In: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 109:1

Related links:: https://doi.org/10.1...; show more...; https://uu.diva-port... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

Using a data sample of (10087 ± 44) x 106 J/ψ events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ → e+e-η(1405) is observed via the decay η(1405) → π0f0(980), f0(980) → π+π-, with a significance of about 9.8σ. The branching fraction of this decay is measured to be B(J/ψ → e+e−η(1405) → e+e−π0f0(980) → J/ψ→ e+e-η(1405) → e+e-π0f0(980) → e+e-π0π+ π-) = (2.04 ± 0.20(stat) ± 0.08(syst)) x 10-7. The branching fraction ratio B(J/ψ → e+e- η(1405))/B(J/ψ → γη(1405)) is determined to be (1.36 ± 0.17(stat) ± 0.06(syst)) x 10-2. Furthermore, an e+e- invariant mass dependent transition form factor of J/ψ → e+e-η(1405) is presented for the first time. The obtained result provides input for different theoretical models and is valuable for the improved understanding the intrinsic structure of the η(1405) meson.

By the author/editor: Ablikim, M.; Adlarson, Patrik; Johansson, Tord; Kupsc, Andrzej; Schönning, Karin ...; Thorén, Viktor; show more...; Wolke, Magnus; Zu, J.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Subatomic Physic ...

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