3 years ago

# Search for a strangeonium-like structure $Z_s$ decaying into $\phi \pi$ and a measurement of the cross section $e^+e^-\rightarrow\phi\pi\pi$.

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

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 $e^+e^-\rightarrow \phi\pi\pi$, and search for a strangeonium-like structure $Z_s$ decaying into $\phi \pi$. No signal is observed in the $\phi\pi$ mass spectrum around 1.4 GeV/$c^2$. Upper limits on the cross sections for $Z_s$ production at the 90\% confidence level are determined. In addition, the cross sections of $e^+e^-\rightarrow\phi\pi^{+}\pi^{-}$ and $e^+e^-\rightarrow \phi\pi^{0}\pi^{0}$ at 2.125 GeV are measured to be $(343.0\pm5.1\pm25.1)$ pb and $(208.3\pm7.6\pm13.5)$ pb, respectively, where the first uncertainties are statistical and the second systematic.

Publisher URL: http://arxiv.org/abs/1801.10384

DOI: arXiv:1801.10384v1

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