Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. D 73, 111102(R) (2006). Copyright © 2006 American Physical Society. Permission to use.


We present the results of a search for the production of an excited state of the muon, μ*, in proton antiproton collisions at √s = 1:96 TeV. The data have been collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 380 pb-1. We search for μ* in the process pp̅ → μ*μ, with the μ* subsequently decaying to a muon plus photon. No excess above the standard model expectation is observed in data. Interpreting our data in the context of a model that describes μ* production by four-fermion contact interactions and μ* decay via electroweak processes, we set a 95% confidence level production cross section upper limit ranging from 0.057 to 0.112 pb, depending on the mass of the excited muon. Choosing the scale for contact interactions to be Λ = 1 TeV, excited muon masses below 618 GeV are excluded.

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