학술논문
Search for Charged Excited States of Dark Matter with KamLAND-Zen
Document Type
Working Paper
Author
collaboration, KamLAND-Zen; Abe, S.; Eizuka, M.; Futagi, S.; Gando, A.; Gando, Y.; Goto, S.; Hachiya, T.; Hata, K.; Hosokawa, K.; Ichimura, K.; Ieki, S.; Ikeda, H.; Inoue, K.; Ishidoshiro, K.; Kamei, Y.; Kawada, N.; Kishimoto, Y.; Koga, M.; Kurasawa, M.; Mitsui, T.; Miyake, H.; Morita, D.; Nakahata, T.; Nakajima, R.; Nakamura, K.; Nakamura, R.; Nakane, J.; Ozaki, H.; Sakai, T.; Shimizu, I.; Shirai, J.; Shiraishi, K.; Shoji, R.; Suzuki, A.; Takeuchi, A.; Tamae, K.; Watanabe, H.; Watanabe, K.; Obara, S.; Yoshida, S.; Umehara, S.; Fushimi, K.; Kotera, K.; Urano, Y.; Ichikawa, A. K.; Berger, B. E.; Fujikawa, B. K.; Learned, J. G.; Maricic, J.; Axani, S. N.; Fu, Z.; Smolsky, J.; Winslow, L. A.; Efremenko, Y.; Karwowski, H. J.; Markoff, D. M.; Tornow, W.; Dell'Oro, S.; O'Donnell, T.; Detwiler, J. A.; Enomoto, S.; Decowski, M. P.; Weerman, K. M.; Grant, C.; Li, A.; Song, H.
Source
Subject
Language
Abstract
Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter ($\chi^{0}$) accompanied by a negatively charged excited state ($\chi^{-}$) with a small mass difference (e.g. $<$ 20 MeV) can form a bound-state with a nucleus such as xenon. This bound-state formation is rare and the released energy is $\mathcal{O}(1-10$) MeV depending on the nucleus, making large liquid scintillator detectors suitable for detection. We searched for bound-state formation events with xenon in two experimental phases of the KamLAND-Zen experiment, a xenon-doped liquid scintillator detector. No statistically significant events were observed. For a benchmark parameter set of WIMP mass $m_{\chi^{0}} = 1$ TeV and mass difference $\Delta m = 17$ MeV, we set the most stringent upper limits on the recombination cross section times velocity $\langle\sigma v\rangle$ and the decay-width of $\chi^{-}$ to $9.2 \times 10^{-30}$ ${\rm cm^3/s}$ and $8.7 \times 10^{-14}$ GeV, respectively at 90% confidence level.