New phases in {ital CP}-violating {ital B} decay asymmetries from mixing to singlet down quarks

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.49.2322· OSTI ID:142712

Choong, W; Silverman, D ^[1]

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

Groups such as E{sub 6} with extra SU(2){sub {ital L}} singlet down quarks give rise to flavor-changing neutral currents (FCNC`s) through the mixing of four or more down quarks. These currents may substantially contribute to the processes of {ital B}{sub {ital d}}{sup 0-}{ital {bar B}} {sub {ital d}}{sup 0} and {ital B}{sub {ital s}}{sup 0-}{ital {bar B}} {sub {ital s}}{sup 0} mixing, within the allowed range of nonzero values for the four quark mixing parameters. These would then introduce new angles and phases into the {ital CP}-violating {ital B} decay asymmetries. Other, negative FCNC experiments put limits on these angles. Using a maximum likelihood analysis with contributions from both the standard model and the FCNC`s, we find large regions for new physics phases contributing to {ital CP}-violating {ital B} decay asymmetries. From the bound on the mixing elements, the new singlet down quark might have a mass above the 500 GeV range.

• OSTI ID: 142712
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 49; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ASYMMETRY
B MESONS
CP INVARIANCE
FLAVOR
MAXIMUM-LIKELIHOOD FIT
MIXING
PARTICLE DECAY
SU-2 GROUPS
WEAK NEUTRAL CURRENTS