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Search for excited muons in pp-bar collisions at s√=1.96 TeV
Baringer, Philip S. ; Bean, Alice ; Coppage, Don ; Gardner, J. ; Hensel, Carsten ; Moulik, Tania ; Wilson, Graham Wallace
Baringer, Philip S.
Bean, Alice
Coppage, Don
Gardner, J.
Hensel, Carsten
Moulik, Tania
Wilson, Graham Wallace
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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 pp-bar→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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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.73.111102.
Date
2006-06-02
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American Physical Society
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Abazov et al. "Search for excited muons in pp-bar collisions at sqrt(s) = 1.96 TeV. Physical Review D, 73(11):111102(R). http://dx.doi.org/10.1103/PhysRevD.73.111102