Measurement of the branching fraction of J/ψ→ωη′π+π− and search for

M. Ablikim¹,

М. Н. Ачасов²,

P. Adlarson³

et al.

Abstract

Using a sample of 1.31 × 10 9 J∕ψ events collected by the BESIII detector at BEPCII during 2009 and 2012, we study the J∕ψ → ωη 0 π þ π − hadronic process. For the first time, we measure the branching ratio BðJ∕ψ → ωη 0 π þ π − Þ ¼ ð1.12 AE 0.02 AE 0.13Þ × 10 −3. We search for the Xð1835Þ state in the η 0 π þ π − invariant mass spectra. No evidence is found and we estimate the upper limit on the branching fraction at 90% confidence level to be BðJ∕ψ → ωXð1835Þ; Xð1835Þ → η 0 π þ π − Þ < 6.2 × 10 −5 .

Light meson spectroscopy at BESIII

“…Based on a sample of 1.31 × 10 9 J/ψ events collected with the BESIII detector, J/ψ → ωπ + π − η ′ is also studied [18]. No significant X(1835) signal is observed in the π + π − η ′ invariant mass spectrum.…”

Search for the weak decay *

“…The decays of the 𝐽/𝜓 provide an excellent platform for investigating light hadron spectroscopy and searching for unconventional hadrons. Several resonances in the mass range of 1.8 to 1.9 GeV/𝑐 2 have been observed in the 𝐽/𝜓 decays, including the 𝑋(𝑝p) [1][2][3], 𝑋(1835) [4][5][6][7], 𝑋(1810) [8] and 𝑋(1870) [9]. The 𝑋(1835) is first observed in the BESII experiment in the 𝜋 + 𝜋 − 𝜂 ′ invariant mass spectrum through the radiative decay of 𝐽/𝜓 → 𝛾𝜋 + 𝜋 − 𝜂 ′ with a statistical significance of 7.7𝜎 [4].…”

“…In Ref. [7], a search for the 𝐽/𝜓 → 𝜔𝑋(1835) → 𝜔𝜋 + 𝜋 − 𝜂 ′ hadronic decays is performed and no significant signal is observed. The 𝑋(1870) resonance is first observed in the 𝜋 + 𝜋 − 𝜂 invariant mass spectrum via the decay of 𝐽/𝜓 → 𝜔𝜋 + 𝜋 − 𝜂 [9] with a statistical significance of 7.2𝜎, based on a sample of (225.2 ± 2.8) × 10 6 𝐽/𝜓 events collected by the BESIII experiment.…”