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Search for a strangeonium-like structure Zs decaying into φπ and a measurement of the cross section e+e- →φππ

Ablikim M., Achasov M. N., Ahmed S., Albrecht M., Amoroso A., An F. F., An Q., Bai J. Z., Bai Y., Bakina O., Baldini Ferroli R., Ban Y., Bennett D. W., Bennett J. V., Berger N., Bertani M., Bettoni D., Bian J. M., Bianchi F., Boger E., Boyko I., Briere R. A., Cai H., Cai X., Cakir O., Calcaterra A., Cao G. F., Cetin S. A., Chai J., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen M. L., Chen P. L., Chen S. J., Chen X. R., Chen Y. B., Chu X. K., Cibinetto G., Dai H. L., Dai J. P., Dbeyssi A., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., De Mori F., Ding Y., Dong C., Dong J., Dong L. Y., Dong M. Y., Dou Z. L., Du S. X., Duan P. F., Fang J., Fang S. S., Fang Y., Farinelli R., Fava L., Fegan S., Feldbauer F., Felici G., Feng C. Q., Fioravanti E., Fritsch M., Fu C. D., Gao Q., Gao X. L.

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . Using a data sample of e+e- collision data corresponding to an integrated luminosity of 108 pb-1 collected with the BESIII detector at a center-of-mass energy of 2.125 GeV, we study the process e+e-→φππ and search for a strangeoniumlike structure Zs decaying into φπ. No signal is observed in the φπ mass spectrum. Upper limits on the cross sections for Zs production at the 90% confidence level are determined. In addition, the cross sections of e+e-→φπ+π- and e+e-→φπ0π0 at 2.125 GeV are measured to be (436.2±6.4±30.1) pb and (237.0±8.6±15.4) pb, respectively, where the first uncertainties are statistical and the second systematic.