Effects of the fourth generation on \(\Delta M_{B_{d,s}}\) in \(B^0\)\(\bar B^0\) mixing

  • W.-J. Huo
Theoretical physics


We investigate the mass differences \(\Delta M_{B_{d,s}}\) in \(B^0_{d,s}\)\(\bar B^0_{d,s}\) mixing with a new up-like quark \(t^{\prime}\) in the sequential fourth generation model. We give the basic formulae for \(\Delta M_{B_{d,s}}\) in this model and obtain two kinds of numerical results for \(\Delta M_{B_{s}}\) as a function of \(m_{t^{\prime}}\). We find that one of our results can satisfy the present experimental lower bound of \(\Delta M_{B_s}\). We also get the constraints of the fourth generation CKM factor \(V^*_{t'b}V_{t'd}\), as a function of \(t'\), from the experimental measurements of \(\Delta M_{B_d}\). Thus, \(\Delta M_{B_{d,s}}\) provides a possible test of the fourth generation and may give a signal of new physics.


Generation Model Experimental Measurement Mass Difference Fourth Generation Basic Formula 
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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2002

Authors and Affiliations

  • W.-J. Huo
    • 1
  1. 1.CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China CN

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