Search for the f1(1285) → π+π-π0 decay with the VES detector

Mechanisms of the isospin-breaking decayf1(1285)→f0(980Achasov1, Кожевников2, Shestakov3 2016Phys. Rev. D250540View full textAdd to dashboardCite

“…The phenomenon of the a 0 0 (980) − f 0 (980) mixing [1] gave the impetus to the doing experiments on reactions (a)-(f) which were made by the collaborations VES [27,28] and BESIII [29][30][31]. In the present work, we show the principal possibility of the estimate of coupling constants of the a 0 (980) and f 0 (980) resonances using the BESIII data [29] on the a 0 (980) − f 0 (980) mixing.…”

“…Since that time many new proposals appeared, concerning both searching it and estimating the effects related with this phenomenon . Recently, the results of the first experiments on its discovery in the reactions [30], (e) J/ψ → φf 0 (980)π 0 → φ 3π [31], (f) J/ψ → φf 1 (1285) → φf 0 (980)π 0 → φ 3π [31] have been obtained with the help of detectors VES in Protvino [27,28] and BESIII in Beijing [29][30][31]. The theoretical considerations concerning the BESIII data [30] * achasov@math.nsc.ru † kozhev@math.nsc.ru ‡ shestako@math.nsc.ru on the reaction (d), that is, on the decay η(1405) → f 0 (980)π 0 → 3π, were presented in [32][33][34][35].…”

Strong isospin symmetry breaking in light scalar meson production

“…Interest in the isospin-violating a 0 0 (980) − f 0 (980) mixing has not abated over the last decade [5,95,96,. Effects related to this phenomenon have been discovered and experimentally studied using the VES (Vertex Spectrometer) detector in Protvino [119][120][121][122] and the BES III detector in Beijing [96,125,134] in the reactions [134]. (28) The results of these experiments have shown quite clearly [5,95,135] that similar isospin violation effects, which are due to the mass difference of the K + and K 0 mesons, can emerge not only as a result of the a 0 0 (980) − f 0 (980) mixing alone but also from any mechanism of KK-pair production with a definite isospin in the S-wave:…”

“…The first preliminary observations of the isotopicsymmetry-violating decay f 1 (1285) → π + π − π 0 obtained using the VES detector at the Protvino accelerator [119] were reported in 2007 at the 12th International Conference on Hadron Spectroscopy (Hadron 2007) (see also [120,121]). The reaction of the diffraction production of the π − f 1 (1285) system, π − N → π − f 1 (1285)N , was used as a source of f 1 (1285) mesons.…”

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

“…Recently, this phenomenon has been discovered experimentally and studied with the help of detectors VES in Protvino in π − N collisions [4,5] and BESIII in Beijing in J/ψ decays [6][7][8]. 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].…”