Does Bd and Bs mixing require the existence of a fourth generation?

WEI-SHU HOUA. Soni2019-12-272019-12-271985https://scholars.lib.ntu.edu.tw/handle/123456789/442878Does Bd and Bs mixing require the existence of a fourth generation?journal article10.1016/0370-2693(87)91682-02-s2.0-0041586389https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041586389&doi=10.1016%2f0370-2693%2887%2991682-0&partnerID=40&md5=561d52ad0134218cefa24dd02347629f