Search for Darkonium in <i>e</i><SUP>+</SUP> <i>e</i><SUP>-</SUP> Collisions

Lees, JP, Poireau, V, Tisserand, V, Grauges, E, Palano, A, Eigen, G, Brown, DN, Kolomensky, Yu G, Fritsch, M, Koch, H
et al (show 230 more authors) (2022) Search for Darkonium in <i>e</i><SUP>+</SUP> <i>e</i><SUP>-</SUP> Collisions. PHYSICAL REVIEW LETTERS, 128 (2). 021802-.

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Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existence of dark matter bound states (darkonia) remains to be investigated. This possibility could arise in a simple model in which a dark photon (A^{'}) is light enough to generate an attractive force between dark fermions. We report herein a search for a J^{PC}=1^{--} darkonium state, the ϒ_{D}, produced in the reaction e^{+}e^{-}→γϒ_{D}, ϒ_{D}→A^{'}A^{'}A^{'}, where the dark photons subsequently decay into pairs of leptons or pions, using 514  fb^{-1} of data collected with the BABAR detector. No significant signal is observed, and we set bounds on the γ-A^{'} kinetic mixing as a function of the dark sector coupling constant for 0.001<m_{A^{'}}<3.16  GeV and 0.05<m_{ϒ_{D}}<9.5  GeV.

Item Type: Article
Uncontrolled Keywords: <i><span class="sc">B</span>A<span class="sc">B</span>AR</i> Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 10 Feb 2022 10:08
Last Modified: 17 Oct 2023 12:18
DOI: 10.1103/PhysRevLett.128.021802
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