How well do we know the Kobayashi-Maskawa matrix

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Physical Review (Section) D: Particles and Fields; (USA)

DOI:https://doi.org/10.1103/PhysRevD.40.1562· OSTI ID:5554325

Cudell, J R ^[1]; Halzen, F ^[2]; Pakvasa, S ^[3]

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1. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB39EW, United Kingdom (GB)
2. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
3. Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822

We evaluate the Kobayashi-Maskawa (KM) matrix using a maximum-likelihood method which takes into account experimental errors on input data and systematic errors'' associated with theoretical approximations. We carefully reconsider the constraints from meson decays and mixings as well as {ital CP} violation. We derive values for all matrix elements with errors smaller than 0.008, show that the ratio {vert bar}{ital U}{sub {ital ub}}/U{sub cb}{vert bar} must be bigger than 0.036, and that the phase angle {delta} of the KM representation is smaller than {pi}. Surprisingly our conclusions depend very weakly on the value of the top-quark mass. Any experiment violating the constraints of our fitted KM matrix would imply physics beyond the standard model with three generations and a minimal Higgs sector.

• OSTI ID: 5554325
• Journal Information: Physical Review (Section) D: Particles and Fields; (USA), Journal Name: Physical Review (Section) D: Particles and Fields; (USA) Vol. 40:5; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645203* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
645300 -- High Energy Physics-- Particle Invariance Principles & Symmetries
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MESONS
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
CP INVARIANCE
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FLAVOR MODEL
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
KOBAYASHI-MASKAWA MATRIX
LEPTONS
LIE GROUPS
MASS
MATHEMATICAL MODELS
MATRICES
MATRIX ELEMENTS
MAXIMUM-LIKELIHOOD FIT
MESONS
MUONS
NUMERICAL SOLUTION
PARTICLE DECAY
PARTICLE MODELS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARK MODEL
QUARKS
SEMILEPTONIC DECAY
STANDARD MODEL
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
TOP PARTICLES
U GROUPS
U-1 GROUPS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
UNITARITY
WEAK INTERACTIONS
WEAK PARTICLE DECAY
WEINBERG-SALAM GAUGE MODEL