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

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 supers...

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Published in:arXiv.org 2021-01
Main Authors: 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, 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, K Z, Yoshida, M, Berger, B E, Fujikawa, B K, Grant, C, A Li, Learned, J G, Maricic, J, Axani, S, Winslow, L A, Z Fu, Efremenko, Y, Karwowski, H J, Markoff, D M, Tornow, W, ODonnell, T, DellOro, S, Detwiler, J A, Enomoto, S, Decowski, M P
Format: Article
Language:English
Subjects:
Confidence intervals
Dark matter
Mathematical models
Parameters
Scintillation counters
Xenon isotopes
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Summary: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).
ISSN:2331-8422