Search for excited muons in pp̅ collisions at √s = 1:96 TeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory R. Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

5-31-2006

Comments

Published by American Physical Society. Phys. Rev. D 73, 111102(R) (2006). http://prd.aps.org. Copyright © 2006 American Physical Society. Permission to use.

Abstract

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.