${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$  Decay Mode Summary INSPIRE   PDGID:
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level
$\Gamma_{553}$ ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ $<6.4 \times 10^{-8}$ CL= 90% 2611
Category: Lepton Family number ($\mathit LF$) or Lepton number ($\mathit L$) or Baryon number ($\mathit B$) violating modes, or/and $\Delta \mathit B$ = 1 weak neutral current ($\mathit B1$) modes
Note: (B1) Allowed by higher-order electroweak interactions.
Note: An ${{\mathit \ell}}$ indicates an ${{\mathit e}}$ or a ${{\mathit \mu}}$ mode, not a sum over these modes.
The following data is related to the above value: