4.4 Article

Forecasting dark showers at Belle II

期刊

JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 12, 页码 -

出版社

SPRINGER
DOI: 10.1007/JHEP12(2022)005

关键词

Dark Matter at Colliders; New Light Particles

资金

  1. Deutsche Forschungsgemeinschaft (DFG) through the Collaborative Research [TRR 257, 396021762 - TRR 257]
  2. Emmy Noether [KA 4662/1-1]
  3. Germany's Excellence Strategy [EXC 2121, 390833306]
  4. Helmholtz (HGF) Young Investigators [VH-NG-1303]
  5. Natural Sciences and Engineering Research Council of Canada
  6. Compute Canada
  7. CANARIE
  8. U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-AC02-07CH11359]

向作者/读者索取更多资源

This study investigates the sensitivity of B factory experiments to dark showers produced through an effective interaction arising from a heavy off-shell mediator, finding Belle II to be more sensitive to dark showers compared to BaBar. Additionally, the underlying structure of the effective interaction can be resolved at higher-energy experiments, with LHCb and Belle II being most sensitive to different particle decay lengths.
Dark showers from strongly interacting dark sectors that confine at the GeV scale can give rise to novel signatures at e(+)e(-) colliders. In this work, we study the sensitivity of B factory experiments to dark showers produced through an effective interaction arising from a heavy off-shell mediator. We show that a prospective search for displaced vertices from GeV-scale long-lived particles at Belle II can improve the sensitivity to dark showers substantially compared to an existing search at BaBar. We compare the sensitivity of searches for displaced signals to searches for promptly produced resonances at BaBar and KLOE and calculate sensitivity projections for a single-photon search at Belle II to invisible dark showers produced through an effective interaction. The underlying structure of the effective interaction can be resolved at higher-energy experiments, where the mediator can be produced on-shell. To study the resulting constraints, we update electroweak precision bounds on kinetically mixed Z' bosons and reinterpret a search for low-mass di-muon resonances at LHCb in terms of dark showers. We find that LHCb and Belle II are most sensitive to different particle decay lengths, underscoring the complementarity of LHC and intensity frontier experiments.

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