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 00:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

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

Silverman, D ^[1]

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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), Vol. 45:5; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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ANNIHILATION
ASYMMETRY
B NEUTRAL MESONS
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EIGENSTATES
FLAVOR MODEL
MATRIX ELEMENTS
NEUTRAL CURRENTS
QUARKS
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MATHEMATICAL MODELS
MESONS
PARTICLE INTERACTIONS
PARTICLE MODELS
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PSEUDOSCALAR MESONS
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662350* - Decays of Mesons- (1992-)
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