Amplitude Analysis of the Decays η′→π+π−π

Abstract

Amplitude Analysis of the Decays eta ' -> pi(+)pi(-)pi(0) and eta' -> pi(0)pi(0)pi (0)

Search for the decay η′→γγη

“…The most stringent upper limit, reported by GAMS-4π setup, on the branching fraction of this decay is 8 × 10 −4 at the 90% confidence level (CL) [10]. The BESIII experiment using J=ψ radiative decays has observed a series of η 0 new decay modes [11][12][13][14][15][16][17], and in this paper we present a search for η 0 → γγη in the J=ψ radiative decay.…”

Probing light dark matter with a hadrophilic scalar mediator

“…Due to the strength of the other meson bounds, we focus only on the mass region m K − m π < m S < m η − m π , above the kinematic reach of kaon decays. If it decays to SM particles, a scalar of this mass would contribute to the decay η → 3π, which has been measured by BESIII [67]. We require that for such a scalar, the branching ratio for η → πS not exceed the measured branching ratio for η → 3π.…”

Study of the isospin breaking decay Y(2175)→ϕf0(980)Cheng1, Li2, Wang3 et al. 2019Phys. Rev. D8030View full textAdd to dashboardCite

“…The relative ratio of B(η → π + π − π 0 )/B(η → π + π − η) has been measured by BESIII [40] and CLEO Collaboration [41]. The recent value measured by BESIII Collaboration is (8.8±1.2)×10 −3 [42,43]. Employing the relation B(f 0 (980) → π + π − ) = 2B(f 0 (980) → π 0 π 0 ),…”

“…Because of the narrow peak near the KK thresholds in the ηπ 0 invariant mass spectrum, the event selection criteria for the a 0 0 (980) candidates has high efficiency. In addition, the final states contain six photons and two charged tracks, the detection efficiency for J/ψ → ηY (2175)) → ηφf 0 (980) → ηφηπ 0 decay can be as large as 8% after the final selection [37,42,52,53]. The BESIII experiment will accumulate huge data sample of 10 × 10 9 J/ψ decays by the end of 2019 [53][54][55].…”