Observation of $a^{0}_{0}(980)$-$f_{0}(980)$ Mixing
22 Jun 2018 · Ablikim M. BESIII Collabration, Achasov M. N. BESIII Collabration, Ahmed S. BESIII Collabration, Albrecht M. BESIII Collabration, Alekseev M. BESIII Collabration, Amoroso A. BESIII Collabration, An F. F. BESIII Collabration, An Q. BESIII Collabration, Bai J. Z. BESIII Collabration, Bai Y. BESIII Collabration, Bakina O. BESIII Collabration, Ferroli R. Baldini BESIII Collabration, Ban Y. BESIII Collabration, Bennett D. W. BESIII Collabration, Bennett J. V. BESIII Collabration, Berger N. BESIII Collabration, Bertani M. BESIII Collabration, Bettoni D. BESIII Collabration, Bian J. M. BESIII Collabration, Bianchi F. BESIII Collabration, Boger E. BESIII Collabration, Boyko I. BESIII Collabration, Briere R. A. BESIII Collabration, Cai H. BESIII Collabration, Cai X. BESIII Collabration, Cakir O. BESIII Collabration, Calcaterra A. BESIII Collabration, Cao G. F. BESIII Collabration, Cetin S. A. BESIII Collabration, Chai J. BESIII Collabration, Chang J. F. BESIII Collabration, Chelkov G. BESIII Collabration, Chen G. BESIII Collabration, Chen H. S. BESIII Collabration, Chen J. C. BESIII Collabration, Chen M. L. BESIII Collabration, Chen S. J. BESIII Collabration, Chen X. R. BESIII Collabration, Chen Y. B. BESIII Collabration, Chu X. K. BESIII Collabration, Cibinetto G. BESIII Collabration, Dai H. L. BESIII Collabration, Dai J. P. BESIII Collabration, Dbeyssi A. BESIII Collabration, Dedovich D. BESIII Collabration, Deng Z. Y. BESIII Collabration, Denig A. BESIII Collabration, Denysenko I. BESIII Collabration, Destefanis M. BESIII Collabration, De Mori F. BESIII Collabration, Ding Y. BESIII Collabration, Dong C. BESIII Collabration, Dong J. BESIII Collabration, Dong L. Y. BESIII Collabration, Dong M. Y. BESIII Collabration, Dorjkhaidav O. BESIII Collabration, Dou Z. L. BESIII Collabration, Du S. X. BESIII Collabration, Duan P. F. BESIII Collabration, Fang J. BESIII Collabration, Fang S. S. BESIII Collabration, Fang X. BESIII Collabration, Fang Y. BESIII Collabration, Farinelli R. BESIII Collabration, Fava L. BESIII Collabration, Fegan S. BESIII Collabration, Feldbauer F. BESIII Collabration, Felici G. BESIII Collabration, Feng C. Q. BESIII Collabration, Fioravanti E. BESIII Collabration, Fritsch M. BESIII Collabration, Fu C. D. BESIII Collabration, Gao Q. BESIII Collabration, Gao X. L. BESIII Collabration, Gao Y. BESIII Collabration, Gao Y. G. BESIII Collabration, Gao Z. BESIII Collabration, Garillon B. BESIII Collabration, Garzia I. BESIII Collabration, Goetzen K. BESIII Collabration, Gong L. BESIII Collabration, Gong W. X. BESIII Collabration, Gradl W. BESIII Collabration, Greco M. BESIII Collabration, Gu M. H. BESIII Collabration, Gu S. BESIII Collabration, Gu Y. T. BESIII Collabration, Guo A. Q. BESIII Collabration, Guo L. B. BESIII Collabration, Guo R. P. BESIII Collabration, Guo Y. P. BESIII Collabration, Haddadi Z. BESIII Collabration, Han S. BESIII Collabration, Hao X. Q. 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BESIII Collabration, Patteri P. BESIII Collabration, Pelizaeus M. BESIII Collabration, Pellegrino J. BESIII Collabration, Peng H. P. BESIII Collabration, Peters K. BESIII Collabration, Pettersson J. BESIII Collabration, Ping J. L. BESIII Collabration, Ping R. G. BESIII Collabration, Pitka A. BESIII Collabration, Poling R. BESIII Collabration, Prasad V. BESIII Collabration, Qi H. R. BESIII Collabration, Qi M. BESIII Collabration, Qian S. BESIII Collabration, Qiao C. F. BESIII Collabration, Qin N. BESIII Collabration, Qin X. S. BESIII Collabration, Qin Z. H. BESIII Collabration, Qiu J. F. BESIII Collabration, Rashid K. H. BESIII Collabration, Redmer C. F. BESIII Collabration, Richter M. BESIII Collabration, Ripka M. BESIII Collabration, Rolo M. BESIII Collabration, Rong G. BESIII Collabration, Rosner Ch. BESIII Collabration, Sarantsev A. BESIII Collabration, Savrié M. BESIII Collabration, Schnier C. BESIII Collabration, Schoenning K. BESIII Collabration, Shan W. 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BESIII Collabration ·
We report the first observation of $a^{0}_{0}(980)$-$f_{0}(980)$ mixing in the decays of $J/\psi\to\phi f_{0}(980)\to\phi a^{0}_{0}(980)\to\phi\eta\pi^{0}$ and $\chi_{c1}\to a^{0}_{0}(980)\pi^{0}\to f_{0}(980)\pi^{0}\to\pi^{+}\pi^{-}\pi^{0}$, using data samples of $1.31\times10^{9}$ $J/\psi$ events and $4.48\times10^{8}$ $\psi(3686)$ events accumulated with the BESIII detector. The signals of $f_{0}(980)\to a^{0}_{0}(980)$ and $a^{0}_{0}(980)\to f_{0}(980)$ mixing are observed at levels of statistical significance of $7.4\sigma$ and $5.5\sigma$, respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, $g_{a_{0}K^{+}K^{-}}$ and $g_{f_{0}K^{+}K^{-}}$, are estimated. The results improve the understanding of the nature of $a^{0}_{0}(980)$ and $f_{0}(980)$.
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