PAPER / ARXIV:2609.20154
BESIII Collaboration : M. Ablikim , M. N. Achasov , P. Adlarson , X. C. Ai , C. S. Akondi , R. Aliberti , A. Amoroso , Q. An , Y. H. An , M. S. Anderson , Y. Bai , O. Bakina , H. R. Bao , X. L. Bao , M. Barbagiovanni , V. Batozskaya , K. Begzsuren , N. Berger , M. Berlowski , M. B. Bertani , D. Bettoni , F. Bianchi , E. Bianco , A. Bortone , I. Boyko , R. A. Briere , A. Brueggemann , D. Cabiati , H. Cai , M. H. Cai , X. Cai , A. Calcaterra , G. F. Cao , N. Cao , S. A. Cetin , X. Y. Chai , J. F. Chang , T. T. Chang , G. R. Che , Y. Z. Che , C. H. Chen , Chao Chen , G. Chen , H. S. Chen , H. Y. Chen , M. L. Chen , S. J. Chen , S. M. Chen , T. Chen , W. Chen , X. R. Chen , X. T. Chen , X. Y. Chen , Y. B. Chen , Y. Q. Chen , Z. K. Chen , J. Cheng , L. N. Cheng , S. K. Choi , X. Chu , G. Cibinetto , F. Cossio , J. Cottee-Meldrum , H. L. Dai , J. P. Dai , X. C. Dai , A. Dbeyssi , R. E. de Boer , D. Dedovich , Z. Y. Deng , A. Denig , I. Denisenko , M. Destefanis , F. De Mori , E. Di Fiore , X. X. Ding , Y. Ding , Y. X. Ding , J. Dong , L. Y. Dong , M. Y. Dong , X. Dong , Z. J. Dong , M. C. Du , S. X. Du , Shaoxu Du , X. L. Du , Y. Q. Du , Y. Y. Duan , Z. H. Duan , P. Egorov , G. F. Fan , J. J. Fan , K. X. Fan , Y. H. Fan , J. Fang , Jin Fang , S. S. Fang , W. X. Fang
RESUMO
We report the observation of significant double-$s\bar{s}$ production in the $e^+e^-$ continuum, based on the measurement of prompt $\phi$ mesons produced in association with hadrons containing an $s$ quark or an $s\bar{s}$ pair. In an analysis of $e^+e^-$ collision data collected by the BESIII experiment at $\sqrt{s}=3.08~\textrm{GeV}$, the ratio $\sigma(e^+e^- \to \phi\ s\bar{s}+\textrm{anything}) / \sigma(e^+e^-\rightarrow\phi+\textrm{anything})$ is determined to be $(40.4\pm1.7_{\rm stat.}\pm1.5_{\rm syst.})\%$ by detecting and measuring $e^+e^-\to\phi + X(s\bar{s})$, where $X(s\bar{s})$ denotes an $\eta$ meson, an $\eta^{\prime}$ meson, or one of the strange-meson pairs $K^+K^-$, $K^+K^{*-}$, $K^-K^{*+}$, $K^0\bar{K}^{0}$, and $K^0\bar{K}^{*0}+\textrm{c.c.}$. The level of double-$s\bar{s}$ production is in line with the double-$c\bar{c}$ production reported by the Belle and \babar\ collaborations, for which theoretical calculations predict lower rates. The experimental measurement of double $s\bar{s}$ production at BESIII can shed light on the understanding of quark hadronization and QCD.
NO MESMO MAPA