Search for the Pair Production of Dark Particles $X$ with $K_L^0 \to XX$, $X \to \gamma\gamma$

Autor: Lin, C., Ahn, J. K., Choi, J. M., Farrington, M. S., Gonzalez, M., Grethen, N., Hsiung, Y. B., Inagaki, T., Kamiji, I., Kim, E. J., Kim, J. L., Kim, H. M., Kawata, K., Kitagawa, A., Komatsubara, T. K., Kotera, K., Lee, S. K., Lee, J. W., Lim, G. Y., Luo, Y., Matsumura, T., Nakagiri, K., Nanjo, H., Nomura, T., Ono, K., Redeker, J. C., Sato, T., Sasse, V., Shibata, T., Shimizu, N., Shinkawa, T., Shinohara, S., Shiomi, K., Shiraishi, R., Suzuki, S., Tajima, Y., Tung, Y. -C., Wah, Y. W., Watanabe, H., Wu, T., Yamanaka, T., Yoshida, H. Y.

We present the first search for the pair production of dark particles $X$ via $K_L^0\to XX$ with $X$ decaying into two photons using the data collected by the KOTO experiment. No signal was observed in the mass range of 40 - 110 MeV/c$^2$ and 210 - 2

Externí odkaz: http://arxiv.org/abs/2209.11019

First Search for the $K_L \to \pi^0 \gamma$ Decay

Autor: Ahn, J. K., Beckford, B., Campbell, M., Chen, S. H., Choi, J. M., Comfort, J., Dona, K., Farrington, M. S., Hara, N., Haraguchi, H., Hsiung, Y. B., Hutcheson, M., Inagaki, T., Isoe, M., Kamiji, I., Kim, E. J., Kim, J. L., Kim, H. M., Komatsubara, T. K., Kotera, K., Lee, J. W., Lim, G. Y., Lin, C., Lin, Q. S., Luo, Y., Mari, T., Matsumura, T., Mcfarland, D., Miyazaki, K., Murayama, R., Nakagiri, K., Nanjo, H., Nishimiya, H., Noichi, Y., Nomura, T., Nunes, T., Ohsugi, M., Okuno, H., Redeker, J. C., Sato, K., Sato, T., Sato, Y., Shimizu, N., Shimogawa, T., Shinkawa, T., Shinohara, S., Shiomi, K., Shiraishi, R., Su, S., Sugiyama, Y., Suzuki, S., Tajima, Y., Taylor, M., Tecchio, M., Togawa, M., Toyoda, T., Tung, Y. C., Vuong, Q. H., Wah, Y. W., Watanabe, H., Yamanaka, T., Yoshida, H. Y.

Publikováno v: Phys. Rev. D 102, 051103 (2020)

We report the first search for the $K_L \to \pi^0 \gamma$ decay, which is forbidden by Lorentz invariance, using the data from 2016 to 2018 at the J-PARC KOTO experiment. With a single event sensitivity of $(7.1\pm 0.3_{\rm stat.} \pm 1.6_{\rm syst.}

Externí odkaz: http://arxiv.org/abs/2006.14918

A new search for the $K_{L} \to \pi^0 \nu \overline{\nu}$ and $K_{L} \to \pi^{0} X^{0}$ decays

Autor: Ahn, J. K., Baek, K. Y., Banno, S., Beckford, B., Brubaker, B., Cai, T., Campbell, M., Carruth, C., Chen, S. H., Chu, S., Comfort, J., Duh, Y. T., Furukawa, T., Haraguchi, H., Hineno, T., Hsiung, Y. B., Hutcheson, M., Inagaki, T., Isoe, M., Iwai, E., Kamibayashi, T., Kamiji, I., Kawasaki, N., Kim, E. J., Kim, Y. J., Ko, J. W., Komatsubara, T. K., Kurilin, A. S., Lee, G. H., Lee, H. S., Lee, J. W., Lee, S. K., Lim, G. Y., Lin, C., Ma, J., Maeda, Y., Masuda, T., Matsumura, T., Mcfarland, D., Micallef, J., Miyazaki, K., Morgan, K., Murayama, R., Naito, D., Nakagiri, K., Nakajima, Y., Nakaya, Y., Nanjo, H., Nomura, T., Odani, Y., Ogata, R., Okuno, H., Ota, T., Ri, Y. D., Sasaki, M., Sasao, N., Sato, K., Sato, T., Seki, S., Shimogawa, T., Shinkawa, T., Shinohara, S., Shiomi, K., Son, J. S., Stevens, J., Su, S., Sugiyama, Y., Suzuki, S., Tajima, Y., Takahashi, G., Takashima, Y., Tecchio, M., Teo, I., Togawa, M., Toyoda, T., Tung, Y. C., Usuki, T., Wah, Y. W., Watanabe, H., Whallon, N., Woo, J. K., Xu, J., Yamaga, M., Yamamoto, S., Yamanaka, T., Yamauchi, H., Yanagida, Y., Yokota, H., Yoshida, H. Y., Yoshimoto, H.

Publikováno v: Prog. Theor. Exp. Phys. (2017) 021C01

We searched for the $CP$-violating rare decay of neutral kaon, $K_{L} \to \pi^0 \nu \overline{\nu}$, in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experiment. One candidate event was observed while $0.34\pm0.16$ backg

Externí odkaz: http://arxiv.org/abs/1609.03637

Pulse shape discrimination of photons and neutrons in the energy range of 0.1 – 2 GeV with the KOTO un-doped CsI calorimeter

Autor: Sugiyama, Y., Ahn, J.K., Banno, S., Beckford, B., Campbell, M., Chen, S.H., Comfort, J., Duh, Y.T., Hineno, T., Hsiung, Y.B., Hutcheson, M., Iwai, E., Kamiji, I., Kawasaki, N., Kim, E.J., Kim, J.L., Kim, Y.J., Ko, J.W., Komatsubara, T.K., Kurilin, A.S., Lee, J.W., Lee, S.K., Lim, G.Y., Lin, C., Lin, Q., Luo, Y., Ma, J., Maeda, Y., Masuda, T., Matsumura, T., Mcfarland, D., Murayama, R., Naito, D., Nakagiri, K., Nakaya, Y., Nanjo, H., Nomura, T., Odani, Y., Redeker, J.C., Ri, Y.D., Sasao, N., Sato, K., Seki, S., Shimogawa, T., Shinkawa, T., Shinohara, S., Shiomi, K., Su, S., Suzuki, S., Tajima, Y., Takahashi, G., Takashima, Y., Tecchio, M., Togawa, M., Tung, Y.C., Wah, Y.W., Watanabe, H., Whallon, N., Woo, J.K., Xu, J., Yamanaka, T., Yanagida, Y., Yoshida, H.Y., Yoshimoto, H.

Publikováno v: In Nuclear Inst. and Methods in Physics Research, A 21 January 2021 987

CsI calorimeter for the J-PARC KOTO experiment

Autor: Sato, K., Lee, J.W., Banno, S., Campbell, M., Comfort, J., Furukawa, T., Iwai, E., Kawasaki, N., Komatsubara, T.K., Lim, G.Y., Maeda, Y., Masuda, T., Matsumura, T., Mcfarland, D., Murayama, R., Naito, D., Nakaya, Y., Nanjo, H., Nomura, T., Odani, Y., Ota, T., Ri, Y.D., Sasaki, M., Sasao, N., Seki, S., Shimogawa, T., Shinkawa, T., Shiomi, K., Sugiyama, Y., Suzuki, S., Tajima, Y., Tecchio, M., Togawa, M., Yamanaka, T., Yanagida, Y., Yokota, H., Yoshimoto, H., Wah, Y.W., Watanabe, H., Xu, J.

Publikováno v: In Nuclear Inst. and Methods in Physics Research, A 1 December 2020 982