Novel 
B
-decay signatures of light scalars at high energy facilities
We study the phenomenology of light scalars of masses m1 and m2 coupling to heavy flavor-violating 
vector bosons of mass mV. For m1;2 
≲ few GeV, this scenario triggers the rare B meson decays 
B0s 
→ 3μþ3μ−, B0 → 3μþ3μ−, Bþ → Kþ3μþ3μ−, and B0s 
→ K03μþ3μ−; the last two being the most 
important ones for m1 ∼ m2. 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 × 10−9, 1.6 × 10−9, 5.9 × 10−9, and 1.8 × 10−8 for the aforementioned 
channels, respectively. For m1;2 ≫ Oð1Þ 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.