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Probing the Dark Sector with Dark Matter Bound States

An, Haipeng and Echenard, Bertrand and Pospelov, Maxim and Zhang, Yue (2016) Probing the Dark Sector with Dark Matter Bound States. Physical Review Letters, 116 (15). Art. No. 151801. ISSN 0031-9007.

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A model of dark sector where O(few GeV) mass dark matter particles χ are supplied by a lighter dark force mediator V, m_V ≪ 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− → 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 → 2V → 2(l^+l^−) and Υ_D → 3V → 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^− → χχ¯ + nV , resulting in missing energy and multiple leptons, will further improve the sensitivity to self-interacting dark matter.

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Additional Information:© 2016 American Physical Society. Received 29 October 2015; revised manuscript received 9 February 2016; published 11 April 2016. We would like to thank Clifford Cheung, Ying Fan, Ming Liu, Mark Wise, and Hai-bo Yu for useful discussions. H. A. is supported by the Walter Burke Institute at Caltech and by DOE Grant No. de-sc0011632. B. E. is supported by the U.S. Department of Energy (DOE) under Grants No. DE-FG02-92ER40701 and No. DE-SC0011925. The work of M. P. is supported in part by NSERC, Canada, and research at the Perimeter Institute is supported in part by the Government of Canada through NSERC and by the Province of Ontario through MEDT. Y. Z. is supported by the Gordon and Betty Moore Foundation through Grant No. 776 to the Caltech Moore Center for Theoretical Cosmology and Physics, and by the DOE Grant No. DE-FG02-92ER40701, and also by a DOE Early Career Award under Grant No. DE-SC0010255. H. A., M. P., and Y. Z. acknowledge the hospitality from the Aspen Center for Physics and the support from NSF Grant No. PHY-1066293.
Group:Walter Burke Institute for Theoretical Physics, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0011632
Department of Energy (DOE)DE-FG02-92ER40701
Department of Energy (DOE)DE-SC0011925
Gordon and Betty Moore Foundation776
Department of Energy (DOE)DE-SC0010255
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Ontario Ministry of Economic Development and TradeUNSPECIFIED
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Record Number:CaltechAUTHORS:20151022-123702814
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Official Citation:Probing the Dark Sector with Dark Matter Bound States Haipeng An, Bertrand Echenard, Maxim Pospelov, and Yue Zhang Phys. Rev. Lett. 116, 151801
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61427
Deposited By: Joy Painter
Deposited On:22 Oct 2015 20:01
Last Modified:25 Jan 2017 03:40

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