for Excited Muons in pbarp Collisions at sqrt(s)=1.96 TeV

THE DZERO COLLABORATION, GUSTAVO OTERO Y GARZON

PHYSICAL REVIEW D - PARTICLE AND FILDS

Año: 2006 p. 1111021 - 1111027

0556-2821

We present the results of a search for the production of an excited state of the muon, m*, in proton antiproton collisions at sqrt(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 m* in the process ppbar à m* m, with the m* 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 m* production by four-fermion contact interactions and m* 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 L = 1 TeV, excited muon masses below 618 GeV are excluded.