Z mediated B - anti-B mixing and B meson CP violating asymmetries in the light of new FCNC bounds
Jun 17, 199114 pages
Published in:
- Phys.Rev.D 45 (1992) 1800-1803
Report number:
- UCI-TR-91-12
Citations per year
Abstract: (APS)
We impose new limits on flavor-changing neutral currents (FCNC's) applied to the 4 ± 4 mixing matrix of the next heaviest down quark in a model with extra SU(2)L singlet down quarks, such as in E6. We find the new bounds still allow tree-level FCNC Z exchange to dominate Bd0−B¯d0 mixing, but not Bs0−B¯s0 mixing. A stronger b→d bound by a factor of 1/10 could rule out the possibility of Z mediation with FCNC accounting for Bd0−B¯d0 mixing. The unitarity "d−b triangle" may still be a quadrangle with a detectable fourth side. The CP asymmetries from Bd0 decay should show a new CP-violating phase if the Z-mediated process dominates Bd0−B¯d0 mixing.- B0 anti-B0: mixing
- Z0: exchange
- exchange: Z0
- neutral current: flavor changing
- quark: singlet
- grand unified theory: E(6)
- B0: decay modes
- decay modes: B0
- CP: violation
- decay: asymmetry
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