Observation of double ss̅ production in e⁺e^- collision at √s = 3.08 GeV

@misc{collaboration2026observation,
  title = {{Observation of double $s\bars$ production in $e^+e^-$ collision at $\sqrts = 3.08~\textrmGeV$}},
  author = {BESIII Collaboration and M. Ablikim and M. N. Achasov and P. Adlarson and X. C. Ai and C. S. Akondi and R. Aliberti and A. Amoroso and Q. An and Y. H. An and M. S. Anderson and Y. Bai and O. Bakina and H. R. Bao and X. L. Bao and M. Barbagiovanni and V. Batozskaya and K. Begzsuren and N. Berger and M. Berlowski and M. B. Bertani and D. Bettoni and F. Bianchi and E. Bianco and A. Bortone and I. Boyko and R. A. Briere and A. Brueggemann and D. Cabiati and H. Cai and M. H. Cai and X. Cai and A. Calcaterra and G. F. Cao and N. Cao and S. A. Cetin and X. Y. Chai and J. F. Chang and T. T. Chang and G. R. Che and Y. Z. Che and C. H. Chen and Chao Chen and G. Chen and H. S. Chen and H. Y. Chen and M. L. Chen and S. J. Chen and S. M. Chen and T. Chen and W. Chen and X. R. Chen and X. T. Chen and X. Y. Chen and Y. B. Chen and Y. Q. Chen and Z. K. Chen and J. Cheng and L. N. Cheng and S. K. Choi},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.20154},
  eprint = {2609.20154},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.20154},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Observation of double ss̅ production in e^+e^- collision at √s = 3.08 GeV
AU  - BESIII Collaboration
AU  - M. Ablikim
AU  - M. N. Achasov
AU  - P. Adlarson
AU  - X. C. Ai
AU  - C. S. Akondi
AU  - R. Aliberti
AU  - A. Amoroso
AU  - Q. An
AU  - Y. H. An
AU  - M. S. Anderson
AU  - Y. Bai
AU  - O. Bakina
AU  - H. R. Bao
AU  - X. L. Bao
AU  - M. Barbagiovanni
AU  - V. Batozskaya
AU  - K. Begzsuren
AU  - N. Berger
AU  - M. Berlowski
AU  - M. B. Bertani
AU  - D. Bettoni
AU  - F. Bianchi
AU  - E. Bianco
AU  - A. Bortone
AU  - I. Boyko
AU  - R. A. Briere
AU  - A. Brueggemann
AU  - D. Cabiati
AU  - H. Cai
AU  - M. H. Cai
AU  - X. Cai
AU  - A. Calcaterra
AU  - G. F. Cao
AU  - N. Cao
AU  - S. A. Cetin
AU  - X. Y. Chai
AU  - J. F. Chang
AU  - T. T. Chang
AU  - G. R. Che
AU  - Y. Z. Che
AU  - C. H. Chen
AU  - Chao Chen
AU  - G. Chen
AU  - H. S. Chen
AU  - H. Y. Chen
AU  - M. L. Chen
AU  - S. J. Chen
AU  - S. M. Chen
AU  - T. Chen
AU  - W. Chen
AU  - X. R. Chen
AU  - X. T. Chen
AU  - X. Y. Chen
AU  - Y. B. Chen
AU  - Y. Q. Chen
AU  - Z. K. Chen
AU  - J. Cheng
AU  - L. N. Cheng
AU  - S. K. Choi
PY  - 2026
DA  - 2026/09/17
PB  - arXiv
DO  - 10.48550/arxiv.2609.20154
UR  - https://arxiv.org/abs/2609.20154
AB  - We report the observation of significant double-ss̅ production in the e^+e^- continuum, based on the measurement of prompt ϕ mesons produced in association with hadrons containing an s quark or an ss̅ pair. In an analysis of e^+e^- collision data collected by the BESIII experiment at √s=3.08 GeV, the ratio σ(e^+e^- → ϕ ss̅+anything) / σ(e^+e^-→ϕ+anything) is determined to be (40.4±1.7_stat.±1.5_syst.)% by detecting and measuring e^+e^-→ϕ+ X(ss̅), where X(ss̅) denotes an η meson, an η^′ meson, or one of the strange-meson pairs K^+K^-, K^+K^*−, K^-K^*+, K^0K̅^0, and K^0K̅^*0+c.c.. The level of double-ss̅ production is in line with the double-cc̅ production reported by the Belle and \babar\ collaborations, for which theoretical calculations predict lower rates. The experimental measurement of double ss̅ production at BESIII can shed light on the understanding of quark hadronization and QCD.
ER  -