Mixing of tt-bar bound states with the Z boson

Journal Article · Mon Jul 01 00:00:00 EDT 1985 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.32.237· OSTI ID:5547466

Franzini, P J; Gilman, F J

We take seriously the possibility that tt-bar bound states are within several GeV/c/sup 2/ of the Z-boson mass and make a careful study of this possible near degeneracy using the mass-mixing formalism. Most of the decay width of vector states below the open-top threshold comes from mixing with the Z. In the idealized situation where there is no coupling of the unmixed tt-bar state to e/sup +/e/sup -/ and ff-bar, the amplitude for e/sup +/e/sup -/..-->..ff-bar has an exact zero at the unmixed mass. Correspondingly, in the physical situation of nonzero couplings, the cross section for e/sup +/e/sup -/..-->..ff-bar exhibits deep minima. We investigate as well the effects of complex mixing matrix elements above the open-top threshold, and calculate longitudinal polarization and forward-backward asymmetries, where there are large enhancements near tt-bar resonance masses.

• Research Organization: Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 5547466
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 32:1; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645203* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ASYMMETRY
BOSONS
BOUND STATE
CROSS SECTIONS
DISTRIBUTION
EIGENSTATES
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON-LEPTON INTERACTIONS
MASS
MATRIX ELEMENTS
PARTICLE INTERACTIONS
POSTULATED PARTICLES
PROPAGATOR
QUARKS
THRESHOLD ENERGY