Study of the isospin breaking decay Y(2175)→ϕf0(980)

Abstract

Using measured branching fraction of the decay J/ψ → ηY (2175)) → ηφf 0 (980) → ηφπ + π − from the BESIII experiment, we estimate branching fraction of J/ψ → ηY (2175)) → ηφf 0 (980) → ηφηπ 0 decay, which proceeds via the f 0 (980)-a 0 0 (980) mixing and the π 0 -η mixing. The branching fraction is predicted to be about O(10 −6 ), which can be accessed with 10 10 J/ψ events collected at the BESIII. The decay is dominated by the contribution from f 0 (980)-a 0 0 (980) mixing. We find that the interference between the amplitudes due to f 0 (980)-a 0 0 (980) mixing and that due to π 0 -η mixing is destructive. The branching fraction can be decreased by about 10% owing to the interference effect. We also study the ηπ 0 mass squared spectrum, and find that a narrow peak due to the f 0 (980)-a 0 0 (980) mixing in the ηπ 0 mass squared spectrum should be observed. The observation of this

New information on the strong isospin symmetry breaking in the reactions of the a00(980) and f0(980) resonance production

“…Very recently, there appeared a proposal to investigate the isospin breaking decay Jψ → ηY(2175) → ηφ f 0 (980) → ηφηπ 0 , which can proceed in the main via the a 0 0 (980) − f 0 (980) mixing [29]. This will be possible, since the BESIII will have 10 10 J/ψ events by the end of 2019.…”

Perturbative corrections to heavy quark-diquark symmetry predictions for doubly heavy baryon hyperfine splittings

“…The recent experimental observation of the Ξ ++ cc baryon has greatly revived the interest in the physics of doubly heavy baryons. This includes the experimental efforts to search for the other doubly charm and bottom baryons such as Ξ + cc and Ξ bc [10] as well as recent theoretical studies regarding the lifetimes, production rates, and decay rates of the double heavy baryons [11][12][13][14][15][16].…”

Semileptonic Decay of $D_s^+\to π^0 \ell^+ ν_\ell$ Via Neutral Meson Mixing

“…where φ s (η ′ → π + π − π 0 (η)) is the phase space volume of the decay mode η ′ → π + π − π 0 (η). The ratio of the phase space can be calculated directly to be [20,21]…”