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Direct detection of electroweak-interacting dark matter

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Abstract

Assuming that the lightest neutral component in an SU(2) L gauge multiplet is the main ingredient of dark matter in the universe, we calculate the elastic scattering cross section of the dark matter with nucleon, which is an important quantity for the direct detection experiments. When the dark matter is a real scalar or a Majorana fermion which has only electroweak gauge interactions, the scattering with quarks and gluon are induced through one- and two-loop quantum processes, respectively, and both of them give rise to comparable contributions to the elastic scattering cross section. We evaluate all of the contributions at the leading order and find that there is an accidental cancellation among them. As a result, the spin-independent cross section is found to be \( \mathcal{O}\left( {{{10}^{ - \left( {46 - 48} \right)}}} \right) \) cm2, which is far below the current experimental bounds.

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Authors and Affiliations

  1. Department of Physics, Nagoya University, Nagoya, 464-8602, Japan

    Junji Hisano & Natsumi Nagata

  2. Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, 277-8568, Japan

    Junji Hisano

  3. California Institute of Technology, Pasadena, CA, 91125, U.S.A.

    Koji Ishiwata

  4. Department of Physics, University of Tokyo, Tokyo, 113-0033, Japan

    Natsumi Nagata

  5. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, 277-8582, Japan

    Tomohiro Takesako

Authors
  1. Junji Hisano
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  2. Koji Ishiwata
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  3. Natsumi Nagata
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  4. Tomohiro Takesako
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Correspondence to Koji Ishiwata.

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Hisano, J., Ishiwata, K., Nagata, N. et al. Direct detection of electroweak-interacting dark matter. J. High Energ. Phys. 2011, 5 (2011). https://doi.org/10.1007/JHEP07(2011)005

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  • DOI: https://doi.org/10.1007/JHEP07(2011)005

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