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Publication
Novel $B$-decay signatures of light scalars at high energy facilities
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Advisor(s)
Abstract(s)
We study the phenomenology of light scalars of masses $m_1$ and $m_2$
coupling to heavy flavour-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 has 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
$m_{1,2}\gg \mathcal{O}(1)$ 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.