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arXiv · 1511.00281

Search for a light dark sector particle at LHCb

Andrea Mauri
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Abstract

A search is presented for a hidden-sector boson, $χ$, produced in the decay $B^0 \rightarrow K^* (892)^0 χ$, with $K^* (892)^0 \rightarrow K^+ π^-$ and $χ\rightarrow μ^+ μ^-$ . The search is performed using a $pp$-collision data sample collected at $\sqrt{s}=7$ and 8 TeV with the LHCb detector, corresponding to integrated luminosities of 1 and 2 fb$^{-1}$ respectively. No significant signal is observed in the mass range $214 \le m_χ\le 4350$ MeV, and upper limits are placed on the branching fraction product $\mathcal{B}(B^0 \rightarrow K^* (892)^0 χ) \times \mathcal{B}(χ\rightarrow μ^+ μ^- )$ as a function of the mass and lifetime of the $χ$ boson. These limits place the most stringent constraints to date on many theories that predict the existence of additional low-mass dark bosons.

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Andrea Mauri. 2015-11-01. Search for a light dark sector particle at LHCb. https://arxiv.org/abs/1511.00281

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