Strong isospin breaking at production of light scalars

Abstract

It is discussed breaking the isotopic symmetry as the tool of studying the production and nature of light scalar mesons.

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

“…Here only a short list of references on this subject is presented. More details may be found in the reviews [20,28]. Nowadays this phenomenon is discovered experimentally and studied with the help of detectors VES in Protvino [6] and BESIII in Beijing [7,9,14,27] in the reactions: [7,27], J/ψ → γη(1405) → γ f 0 (980)π 0 → γ 3π [9], and J/ψ → φ f 1 (1285) → φ f 0 (980)π 0 → φ 3π [14].…”

“…Nowadays this phenomenon is discovered experimentally and studied with the help of detectors VES in Protvino [6] and BESIII in Beijing [7,9,14,27] in the reactions: [7,27], J/ψ → γη(1405) → γ f 0 (980)π 0 → γ 3π [9], and J/ψ → φ f 1 (1285) → φ f 0 (980)π 0 → φ 3π [14]. After these experiments, it has become clear [16,18,20,28] that the similar isospin breaking effects can appear not only due to the a 0 0 (980) − f 0 (980) mixing, but also for any mechanism of the production of the KK pairs with a definite isospin in the S wave: 1 Thus a new tool to study the production mechanisms and the nature of light scalars is emerged. 2 a 0 0 (980) − f 0 (980) mixing…”

Interference phenomena in the decay Ds+→ηπ0π+Achasov1, Shestakov2 2017Phys. Rev. D17090View full textAdd to dashboardCite

“…As a result it has become clear [3,9,10] that the similar isospin breaking effect can appear not only due to the a 0 0 (980) − f 0 (980) mixing, but also due to any mechanism of the production of the KK pairs with the definite isospin in the S wave, X → KK → f 0 (980)/a 0 0 (980) [11]. Thus, a new tool emerged to study the production mechanism and nature of light scalars.…”

Manifestations of the a00(980)−f0(980Achasov1, Shestakov2 2017Phys. Rev. D11030View full textAdd to dashboardCite

“…Recently, we have examined the interference phenomena in the ηπ 0 mass spectrum in the D + s → ηπ 0 π + decay [1] caused by the isospin-breaking a 0 0 (980) − f 0 (980) mixing [2,3]. Their detection would help clarify the production and decay mechanisms of the light scalars f 0 (980) and a 0 0 (980) in weak three-body hadronic D + s decays.…”

“…A detailed list of references concerning the a 0 0 (980) − f 0 (980) mixing can be found, for example, in Refs. [3,4]. In Ref.…”