Predictions and Width Calculator
Quick estimates for dilepton-dominated decays at the 4.92 GeV and 9.42 GeV targets.

Portal models

Preset checks:

  • 4.92 GeV target: set m_X = 4.92
  • 9.42 GeV target: set m_X = 9.42
  • Dileptons: N_c = 1; set m_f = m_e or m_μ
  • Quarks: N_c = 3; set m_f to appropriate quark mass (thresholds matter)
Scalar portal width
Γ(X→f f̄) [GeV]
0.000000195
Vector portal width
Γ(X→f f̄) [GeV]
0.000000131

Suggested targets

For $m_X \simeq 4.92,\, 9.42\ \mathrm{GeV}$, primary channels are $e^+e^-$, $\mu^+\mu^-$ (if open), and light hadrons via $s\bar s$, $c\bar c$ when kinematically allowed. Vector-portal dileptons are natural for LHCb and Belle II (including ISR). Scalar-portal scenarios can be narrower for the same $\varepsilon$. Displaced vertices appear for sufficiently small $\varepsilon$.