First results from the search for an excess of $\barν_{e}$ events in JSNS$^2$
High Energy Accelerator Research Organization (KEK)（高能加速器研究机构）；Research Center for Nuclear Physics, Osaka University（大阪大学核物理研究中心）；University of Michigan（密歇根大学）；Department of Physics and OMEG Institute, Soongsil University（崇实大学物理系及OMEG研究所）；Laboratory for High Energy Physics, Dongshin University（东新大学高能物理实验室）；Department of Physics, Chonnam National University（全南国立大学物理系）；Department of Fire Safety, Seoyeong University（西荣大学消防安全系）；Research Center for Neutrino Science, Tohoku University（东北大学中微子科学研究中心）；Advanced Science Research Center, JAEA（日本原子力研究开发机构先进科学研究中心）；J-PARC Center, JAEA（日本原子力研究开发机构J-PARC中心）
D. H. Lee, S. Ajimura, A. Antonakis, M. Botran, M. K. Cheoun, J. H. Choi, J. W. Choi, J. Y. Choi, T. Dodo, H. Furuta, J. H. Goh, M. Harada, S. Hasegawa, Y. Hino… 展开作者
D. H. Lee, S. Ajimura, A. Antonakis, M. Botran, M. K. Cheoun, J. H. Choi, J. W. Choi, J. Y. Choi, T. Dodo, H. Furuta, J. H. Goh, M. Harada, S. Hasegawa, Y. Hino, T. Hiraiwa, W. S. Hwang, T. Iida, E. Iwai, S. Iwata, H. I. Jang, J. S. Jang, M. C. Jang, H. K. Jeon, S. H. Jeon, K. K. Joo, D. E. Jung, S. K. Kang, Y. Kasugai, T. Kawasaki, E. M. Kim, E. J. Kim, J. Y. Kim, S. Y. Kim, S. B. Kim, W. Kim, H. Kinoshita, T. Konno, K. Kuwata, S. Lee, I. T. Lim, C. Little, T. Maruyama, E. Marzec, S. Masuda, S. Meigo S. Monjushiro, D. H. Moon, T. Nakano, M. Niiyama, K. Nishikawa, M. Noumachi, M. Y. Pac, B. J. Park, H. W. Park, J. B. Park, Jisu Park, J. S. Park, R. G. Park, S. J. M. Peeters, G. Roellinghoff, C. Rott, J. W. Ryu, K. Sakai, S. Sakamoto, T. Shima, C. D. Shin, J. Spitz, I. Stancu, F. Suekane, Y. Sugaya, K. Suzuya, M. Taira, Y. Takeuchi, W. Wang, J. Waterfield, W. Wei, R. White, Y. Yamaguchi, M. Yeh, I. S. Yeo, C. Yoo, I. Yu, A. Zohaib
The JSNS$^2$ (J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source) experiment at the Material and Life Science Facility (MLF) of J-PARC is designed to directly test an excess on $\barν_{e}$ events which was indicated by LSND (Liquid Scintillator Neutrino Detector). The combination of a short-pulsed proton beam and a gadolinium-loaded liquid scintillator provides an excellent signal-to-noise ratio. In this article, we report the first results of a direct test based on data collected in 2022. After applying all event selection criteria, two events are observed, consistent with the expected background of 2.3$\pm$0.4 events. No excess of $\barν_e$ events are seen in this report, however the expected number of events due to LSND anomaly is 1.1$\pm$0.5, thus this result is not yet conclusive. Data taking has been ongoing since 2021 and will continue in future runs. In addition, a new far detector has recently been constructed for the second phase experiment, JSNS$^2$-II, marking an important milestone toward forthcoming measurements.
Search for new resonances decaying to a $W$ or $Z$ boson and a Higgs boson in the $\ell^+ \ell^- b\bar b$, $\ell νb\bar b$, and $ν\barν b\bar b$ channels with $pp$ collisions at $\sqrt s = 13$ TeV with the ATLAS detector
E835 at FNAL: Charmonium Spectroscopy in $\bar p p$ Annihilations
我目前的初步结果，在其$η_cγ$和$J/ψπ^0$衰变模式的$h_c$搜索。我们观察到过量的η_cγ $ events near 3526 MeV that has a probability $ { \cal P} \sim 0.001 $ to arise from background fluctations. The resonance parameters are $ M=3525.8 \pm 0.2 \pm 0.2 $MeV, $ Γ \leq $ 1 MeV, and $ 10.6 \pm 3.7 \pm 3.4（br）< Γ_{ \bar{p} p} B_{η_cγ} < 12.8 \pm 4.8 \pm 4.5（br）$eV. We find no event excess within the search region in the $ J/π^0$模式。
