arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.04907physics.ins-dethep-ex
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在欧洲空间源转换成反中子和/或无菌中子的中子的新的高灵敏度搜索

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source

A. Addazi, K. Anderson, S. Ansell, K. Babu, J. Barrow, D. V. Baxter, P. M. Bentley, Z. Berezhiani, R. Bevilacqua, C. Bohm, G. Brooijmans, J. Broussard, R. Biond… 展开作者

A. Addazi, K. Anderson, S. Ansell, K. Babu, J. Barrow, D. V. Baxter, P. M. Bentley, Z. Berezhiani, R. Bevilacqua, C. Bohm, G. Brooijmans, J. Broussard, R. Biondi, B. Dev, C. Crawford, A. Dolgov, K. Dunne, P. Fierlinger, M. R. Fitzsimmons, A. Fomin, M. Frost, S. Gardner, A. Galindo-Uribarri, E. Golubeva, S. Girmohanta, G. L. Greene, T. Greenshaw, V. Gudkov, R. Hall-Wilton, L. Heilbronn, J. Herrero-Garcia, G. Ichikawa T. M. Ito, E. Iverson, T. Johansson, L. Joensson, Y-J. Jwa, Y. Kamyshkov, K. Kanaki, E. Kearns, M. Kitaguchi, T. Kittelmann, E. Klinkby, L. W. Koerner, B. Kopeliovich, A. Kozela, V. Kudryatsev, A. Kupsc, Y. Lee, M. Lindroos, J. Makkinje, J. I. Marquez, R. Mohapatra, B. Meirose, T. M. Miller, D. Milstead, T. Morishima, G. Muhrer, H. P. Mumm, K. Nagamoto, V. V. Nesvizhevsky, T. Nilsson, A. Oskarsson, E. Paryev, R. W. Pattie, S. Penttil, Y. N. Pokotilovski, I. Potashnikova, C. Redding, J-M Richard, D. Ries, E. Rinaldi, A. Ruggles, B. Rybolt, V. Santoro, U. Sarkar, A. Saunders, G. Senjanovic, A. P. Serebrov, H. M. Shimizu, R. Shrock, S. Silverstein, D. Silvermyr, W. M. Snow, A. Takibayev, L. Townsend, I. Tkachev, L. Varriano, A. Vainshtein, J. de VRies, R. Woracek, Y. Yamagata, A. R. Young, L. Zanini, Z. Zhang, O. Zimmer

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摘要：

重子数（$\mathcal{B}$）的违反是优先创造物质而不是反物质的一个基本因素，这是解释宇宙中观察到的重子不对称性所必需的。然而，这样的过程还有待实验观察。HIBEAM/NNBAR %实验计划是欧洲空间源（ESS）提出的一个两阶段实验，旨在寻找重子数破坏。该计划将包括高灵敏度的搜索过程，违反重子数的一个或两个单位：自由中子反中子振荡（$n\rightarrow \bar{n}$）通过混合，中子反中子振荡通过再生从无菌中子状态（$n\rightarrow [n',\bar{n}'] \rightarrow \bar{n}$），和中子消失（$n\rightarrow n'$）;有效的$Δ\mathcal{B}=0$过程的中子再生（$n\rightarrow [n',\bar{n}'] \rightarrow n$）也是可能的。该程序可用于发现和测量中子、反中子和无中子区的混合。该实验解决了诸如重子生成的起源、暗物质的性质等热门的开放性问题，并且对新物理学的尺度非常敏感，这些尺度大大超过了对撞机的可用尺度。该计划的一个目标是打开一个发现窗口，中子转换概率（灵敏度）与以前的搜索相比，高达三个数量级。不应浪费在敏感性测试方面取得如此飞跃的机会。该实验汇集了来自粒子（对撞机和低能）和核物理社区的不同国际物理学家团队，同时还包括中子学和磁学专家。

英文摘要：

The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR %experiment program is a proposed two-stage experiment at the European Spallation Source (ESS) to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation ($n\rightarrow \bar{n}$) via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state ($n\rightarrow [n',\bar{n}'] \rightarrow \bar{n}$), and neutron disappearance ($n\rightarrow n'$); the effective $Δ\mathcal{B}=0$ process of neutron regeneration ($n\rightarrow [n',\bar{n}'] \rightarrow n$) is also possible. The program can be used to discover and characterise mixing in the neutron, antineutron, and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis, the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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