Observation of pseudoscalar and tensor resonances inJ/ψ→γϕϕ

Abstract

Based on a sample of (1310.6±10.5)×10 6 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ → γφφ is performed in order to study the intermediate states. +56−33 MeV/c 2 , are observed. In addition to these three pseudoscalar states, the scalar state f0(2100), and three tensor states, the f2(2010), f2(2300) and f2(2340), are observed in the process J/ψ → γφφ. The product branching fractions B(J/ψ → γX) × B(X → φφ) are reported.

Central exclusive diffractive production of K+K−K+K− via the intermediate ϕϕ state

“…Broad J PC = 2 ++ structures around 2.3 GeV were reported in the inclusive π − Be → φφ + X reaction [30,31], in the exclusive π − p → φφn [32,33] and K − p → φφΛ [34,35] reactions, in central production [36][37][38], and in pp annihilations [39]. In the radiative decay J/ψ → γφφ an enhancement near M φφ = 2.25 GeV with preferred J PC = 0 −+ was observed [40][41][42][43]. The last partial wave analysis [43] shows that the η(2225) state is significant, but a large contribution from the direct decay of J/ψ → γφφ, modeled by a 0 −+ phase space distribution of the φφ system, was also found there.…”

The possible members of the $$5^1S_0$$ 5 1 S 0 meson nonet

“…The meson masses used to fit are taken from Refs. [2,3] meson nonets, respectively, one can naturally expect that the π(2360), η(2320), and X (2500) could belong to the 5 1 S 0 nonet based on their masses.…”

“…In the nn and ss bases, the mass-squared matrix describing the η(2320) and X (2500) mixing can be expressed as [4,5, [3] 49]…”

“…3 The dependence of the η(2320) and X (2500) total widths on the φ in the 3 P 0 model with two types of wave functions: a with the SHO wave functions b with the RQM wave functions. The blue and green bands denote the measured widths for the X (2500) and η(2320), respectively [3,48] for X = 330/550, and…”

“…As shown in Table 1, many pseudoscalar states have been accumulated experimentally [2,3]. Among these states, the assignments of the π , η, η , and K as the members of the 1 1 S 0 meson nonet and the π(1300), η(1295), η(1475), and K (1460) as the members of the 2 1 S 0 meson nonet have been widely accepted [2].…”