Probing the Dark Sector with Dark Matter Bound States
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arXiv
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| Format: | Preprint |
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2015
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| _version_ | 1866909299419119616 |
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| author | An, Haipeng Echenard, Bertrand Pospelov, Maxim Zhang, Yue |
| author_facet | An, Haipeng Echenard, Bertrand Pospelov, Maxim Zhang, Yue |
| contents | A model of dark sector where $O({\rm few~GeV})$ mass dark matter particles $χ$ couple to a lighter dark force mediator $V$, $m_V \ll m_χ$, is motivated by the recently discovered mismatch between simulated and observed shapes of galactic haloes. Such models, in general, provide a challenge for direct detection efforts and collider searches. We show that for a large range of coupling constants and masses, the production and decay of the bound states of $χ$, such as $0^{-+}$ and $1^{--}$ states, $η_D$ and $ Υ_D$, is an important search channel. We show that $e^+e^-\to η_D +V$ or $Υ_D +γ$ production at $B$-factories for $α_D > 0.1$ is sufficiently strong to result in multiple pairs of charged leptons and pions via $η_D\to 2V \to 2(l^+l^-)$ and $Υ_D\to 3V \to 3(l^+l^-)$ $(l=e,μ,π)$. The absence of such final states in the existing searches performed at \babar\ and Belle sets new constraints on the parameter space of the model. We also show that a search for multiple bremsstrahlung of dark force mediators, $e^+e^-\to χ\barχ+nV$, resulting in missing energy and multiple leptons, will further improve the sensitivity to self-interacting dark matter. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1510_05020 |
| institution | arXiv |
| publishDate | 2015 |
| record_format | arxiv |
| spellingShingle | Probing the Dark Sector with Dark Matter Bound States An, Haipeng Echenard, Bertrand Pospelov, Maxim Zhang, Yue High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment A model of dark sector where $O({\rm few~GeV})$ mass dark matter particles $χ$ couple to a lighter dark force mediator $V$, $m_V \ll m_χ$, is motivated by the recently discovered mismatch between simulated and observed shapes of galactic haloes. Such models, in general, provide a challenge for direct detection efforts and collider searches. We show that for a large range of coupling constants and masses, the production and decay of the bound states of $χ$, such as $0^{-+}$ and $1^{--}$ states, $η_D$ and $ Υ_D$, is an important search channel. We show that $e^+e^-\to η_D +V$ or $Υ_D +γ$ production at $B$-factories for $α_D > 0.1$ is sufficiently strong to result in multiple pairs of charged leptons and pions via $η_D\to 2V \to 2(l^+l^-)$ and $Υ_D\to 3V \to 3(l^+l^-)$ $(l=e,μ,π)$. The absence of such final states in the existing searches performed at \babar\ and Belle sets new constraints on the parameter space of the model. We also show that a search for multiple bremsstrahlung of dark force mediators, $e^+e^-\to χ\barχ+nV$, resulting in missing energy and multiple leptons, will further improve the sensitivity to self-interacting dark matter. |
| title | Probing the Dark Sector with Dark Matter Bound States |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/1510.05020 |