English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the mass differences $\Delta M_{B_{d,s}}$ in the mixing$B^0_{d,s}-\bar B^0_{d,s}$ with a new up-like quark $t^{\prime}$ in thesequential fourth generation model. We give the basic formulae for $\DeltaM_{B_{d,s}}$ in this model and obtain two kinds of numerical results of $\DeltaM_{B_{s}}$ which is the function of $m_{t^{\prime}}$. We find that one of ourresults can satisfy the present experimental low bound of $\Delta M_{B_s}$. Wealso get the constraints of the fourth generation CKM factor$V^{*}_{t^{'}b}V_{t^{'}d}$, which is the function of $t^{'}$, from theexperimental measurements of $\Delta M_{B_d}$. Thus, $\Delta M_{B_{d,s}}$provide a possible test of the fourth generation and give a signal of the newphysics.Comment: 13 pages, 5 figures. accepted by Europ. Phys. Jour.

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