• Corpus ID: 235446536

Search for Darkonium in $e^+e^-$ Collisions

  title={Search for Darkonium in \$e^+e^-\$ Collisions},
  author={The Babar Collaboration},
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 0 ) is light enough to generate an attractive force between dark fermions. We report herein a search for a J PC ¼ 1… 
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  • 2001

The helicity angle is defined as the angle between the ΥD momentum in the center-of-mass frame and the dark photon momentum in the ΥD rest frame

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    • Strassler et al. Phys. Rev. D 90, 075004
    • 2014

    Wuhan 430072, China. ‡ Present address: Università di Bologna and INFN Sezione di Bologna, I-47921 Rimini, Italy. § Present address: King's College, London WC2R 2LS

      Università di Sassari, I-07100 Sassari, Italy ‡ ‡ Also at: Gran Sasso Science Institute

        Machine Learning 45

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        Natural units (ℏ ¼ c ¼ 1) are used throughout this Letter

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