We study the phenomenology of light scalars of masses $m_1$ and $m_2$ coupling to heavy flavor-violating vector bosons of mass $m_V$. For $m_{1,2}\lesssim$ few GeV, this scenario triggers the rare $B$ meson decays $B_s^0\to 3{\mu }^{+}3{\mu }^{-}$, $B^0\to 3{\mu }^{+}3{\mu }^{-}$, $B^{+}\to K^{+}3{\mu }^{+}3{\mu }^{-}$, and $B_s^0\to K^{0*}3{\mu }^{+}3{\mu }^{-}$; the last two being the most important ones for $m_1\sim m_2$. None of these signals have been studied experimentally; therefore, we propose analyses to test these channels at the LHCb. We demonstrate that the reach of this facility extends to branching ratios as small as $6.0\times {10}^{-9}$, $1.6\times {10}^{-9}$, $5.9\times {10}^{-9}$, and $1.8\times {10}^{-8}$ for the aforementioned channels, respectively. For $m_{1,2}\gg \mathcal{O}(1)\mathrm{GeV}$, we show that slightly modified versions of current multilepton and multitau searches at the LHC can probe wide regions of the parameter space of this scenario. Altogether, the potential of the searches we propose outperform other constraints such as those from meson mixing.

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• Composite models
• Flavor changing neutral currents
• Rare decays
• Bottom mesons
• Hypothetical scalars
• Muons
• Hadron colliders