CDF Logo Search for Long-Lived Parents of the Z0 Boson Exotics Logo

We present the results of our search for particles with long lifetime that decay to a Z0 boson. The possibility of a long-lived parent of the Z0 is predicted by several models, such as a fourth generation quark and supersymmetry and with a gravitino LSP. We vertex dimuons with invariant mass within the Z0 mass window. We find no evidence of signal, and so set cross section limits using the fourth generation quark model.


Plots and Tables:

Acceptance * Efficiency:
Acceptance * efficiency as a function of lifetime, for a b' mass of 150 GeV.
Available formats: GIF,   EPS
Acceptance * efficiency as a function of mass, for a b' lifetime of 10 mm.
Available formats: GIF,   EPS
Data:
Unblinded Lxy distribution, with the Z0 boson pT cut.
Available formats: GIF,   EPS
Unblinded Lxy distribution, without the Z0 boson pT cut.
Available formats: GIF,   EPS
Cross Section Limits:
Cross section limit as a function of lifetime, for a b' mass of 150 GeV, compared to the theoretical cross section.
Available formats: GIF,   EPS
Cross section limit as a function of mass, for a b' lifetime of 10 mm, compared to the theoretical cross section.
Available formats: GIF,   EPS
Lifetime vs. mass exclusion region:
Using the theoretical prediction displayed in the cross section limit plots, we set a 95% confidence exclusion region in mass and lifetime parameter space.
Available formats: GIF,   EPS
Same plot as above, with the Run I result overlaid.
Available formats: GIF,   EPS


Page page: http://www-cdf.fnal.gov/physics/exotic/r2a/20040826.mumulxy_longlifez/index.html was last updated October 21st, 2004 by Stephan Lammel.
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