Z -mediated B - B mixing and B -meson CP -violating asymmetries in the light of new flavor-changing neutral-current bounds

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.1800· OSTI ID:7206015

Silverman, D ^[1]

---

1. Department of Physics, University of California, Irvine, California 92717 (United States)

We impose new limits on flavor-changing and neutral currents (FCNC's) applied to the 4{times}4 mixing matrix of the next heaviest down quark in a model with extra SU(2){sub {ital L}}-singlet down quarks, such as in E{sub 6}. We find the new bounds still allow tree-level FCNC {ital Z} exchange to dominate {ital B}{sub {ital d}}{sup 0-}{ital {bar B}} {sub {ital d}}{sup 0} mixing, but not {ital B}{sub {ital s}}{sup 0-}{ital {bar B}} {sub {ital s}}{sup 0} mixing. A stronger {ital b}{r arrow}{ital d} bound by a factor of 1/10 could rule out the possibility of {ital Z} mediation with FCNC accounting for {ital B}{sub {ital d}}{sup 0-}{ital {bar B}} {sub {ital d}}{sup 0} mixing. The unitarity {ital d}-{ital b} triangle'' may still be a quadrangle with a detectable fourth side. The {ital CP} asymmetries from {ital B}{sub {ital d}}{sup 0} decay should show a new {ital CP}-violating phase if the {ital Z}-mediated process dominates {ital B}{sub {ital d}}{sup 0-}{ital {bar B}} {sub {ital d}}{sup 0} mixing.

• OSTI ID: 7206015
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:5; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANNIHILATION
ASYMMETRY
B MESONS
B NEUTRAL MESONS
BASIC INTERACTIONS
BEAUTY PARTICLES
BOSONS
BRANCHING RATIO
COMPOSITE MODELS
CP INVARIANCE
CURRENTS
EIGENSTATES
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FLAVOR MODEL
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
LIE GROUPS
MATHEMATICAL MODELS
MATRIX ELEMENTS
MESONS
NEUTRAL CURRENTS
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARK MODEL
QUARKS
STANDARD MODEL
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
UNIFIED GAUGE MODELS