Eur. Phys. J. C 24, 275-280 (2002)
Effects of the fourth generation on in B0- mixingW.-J. Huo1, 2
1 CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China
2 Institute of High Energy Physics, Academia Sinica, P.O. Box 918(4), Beijing 100039, P.R. China
(Received: 30 November 2001 / Published online: 26 April 2002 - © Springer-Verlag / Società Italiana di Fisica 2002 )
We investigate the mass differences in B0d,s- mixing with a new up-like quark in the sequential fourth generation model. We give the basic formulae for in this model and obtain two kinds of numerical results for as a function of . We find that one of our results can satisfy the present experimental lower bound of . We also get the constraints of the fourth generation CKM factor V*t'bVt'd, as a function of t', from the experimental measurements of . Thus, provides a possible test of the fourth generation and may give a signal of new physics.
© Società Italiana di Fisica, Springer-Verlag 2002