Where are they?

http://physicstoday.scitation.org/doi/10.1063/PT.3.3494

彼らはどこにいる？
パリティ
2017-09
https://pub.maruzen.co.jp/book_magazine/magazine/parity-back/parity2017/2017_10/1710_cont.html

https://www.nature.com/nature/journal/v184/n4690/pdf/184844a0.pdf?foxtrotcallback=true