Mixing of $\overline{tt}$ bound states with the Zboson

Franzini, Paula J.; Gilman, Frederick J.

doi:10.1103/physrevd.32.237

Mixing of $$\overline{tt}$$ bound states with the Zboson

Journal Article · Mon Jul 01 00:00:00 EDT 1985 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/physrevd.32.237· OSTI ID:1447568

Franzini, Paula J. ^[1]; Gilman, Frederick J. ^[1]

Stanford Univ., CA (United States). Stanford Linear Accelerator Center

We take seriously the possibility that $$\overline{tt}$$ bound states are within several GeV/c² 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 $$\overline{tt}$$ state to $e^+ e^–$ and $$\overline{ff}$$, the amplitude for $e^+ e^–$ →$$\overline{ff}$$ has an exact zero at the unmixed mass. Correspondingly, in the physical situation of nonzero couplings, the cross section for $e^+ e^–$ →$$\overline{ff}$$ exhibits deep minima. Further, we investigate 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 $$\overline{tt}$$ resonance masses.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1447568

Alternate ID(s):: OSTI ID: 5547466

Report Number(s):: SLAC-PUB--3541

Journal Information:: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 32; ISSN 0556-2821

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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