A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector
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A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector

  • Author(s): Abe, S;
  • Asami, S;
  • Gando, A;
  • Gando, Y;
  • Gima, T;
  • Goto, A;
  • Hachiya, T;
  • Hata, K;
  • Hayashida, S;
  • Hosokawa, K;
  • Ichimura, K;
  • Ieki, S;
  • Ikeda, H;
  • Inoue, K;
  • Ishidoshiro, K;
  • Kamei, Y;
  • Kawada, N;
  • Kinoshita, T;
  • Koga, M;
  • Maemura, N;
  • Mitsui, T;
  • Miyake, H;
  • Nakamura, K;
  • Nakamura, K;
  • Nakamura, R;
  • Ono, A;
  • Ota, N;
  • Otsuka, S;
  • Ozaki, H;
  • Sakai, T;
  • Sambonsugi, H;
  • Shimizu, I;
  • Shirahata, Y;
  • Shirai, J;
  • Shiraishi, K;
  • Suzuki, A;
  • Suzuki, Y;
  • Takeuchi, A;
  • Tamae, K;
  • Ueshima, K;
  • Wada, Y;
  • Watanabe, H;
  • Yoshida, Y;
  • Obara, S;
  • Chernyak, D;
  • Kozlov, A;
  • Yoshida, S;
  • Umehara, S;
  • Takemoto, Y;
  • Fushimi, K;
  • Hirata, S;
  • Ichikawa, A;
  • Nakamura, KZ;
  • Yoshida, M;
  • Berger, BE;
  • Fujikawa, BK;
  • Grant, C;
  • Li, A;
  • Learned, JG;
  • Maricic, J;
  • Axani, S;
  • Winslow, LA;
  • Fu, Z;
  • Efremenko, Y;
  • Karwowski, HJ;
  • Markoff, DM;
  • Tornow, W;
  • ODonnell, T;
  • DellOro, S;
  • Detwiler, JA;
  • Enomoto, S;
  • Decowski, MP
  • et al.

There are many theories where a dark matter particle is part of a multiplet with an electrically charged state. If WIMP dark matter ($\chi^{0}$) is accompanied by a charged excited state ($\chi^{-}$) separated by a small mass difference, it can form a stable bound state with a nucleus. In supersymmetric models, the $\chi^{0}$ and the $\chi^{-}$ could be the neutralino and a charged slepton, such as the neutralino-stau degenerate model. The formation binding process is expected to result in an energy deposition of {\it O}(1--10 MeV), making it suitable for detection in large liquid scintillator detectors. We describe new constraints on the bound state formation with a xenon nucleus using the KamLAND-Zen 400 Phase-II dataset. In order to enlarge the searchable parameter space, all xenon isotopes in the detector were used. For a benchmark parameter set of $m_{\chi^{0}} = 100$ GeV and $\Delta m = 10$ MeV, this study sets the most stringent upper limits on the recombination cross section $\langle\sigma v\rangle$ and the decay-width of $\chi^{-}$ of $2.0 \times 10^{-31}$ ${\rm cm^3/s}$ and $1.1 \times 10^{-18}$ GeV, respectively (90\% confidence level).

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