Search for ZZ and Zγ* Production in pp Collisions at √s = 1.96 TeV and Limits on Anomalous ZZZ and ZZγ* Couplings

Authors

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

Document Type

Article

Date of this Version

April 2008

Comments

Published by American Physical Society. Phys. Rev. Lett. 100, 131801 (2008). http://prl.aps.org. Copyright © 2008 American Physical Society. Permission to use.

Abstract

We present a study of μμμμ, eeee, and μμee events using 1 fb^-1 of data collected with the D0 detector at the Fermilab Tevatron pp Collider at √s = 1.96 TeV. Requiring the lepton pair masses to be greater than 30 GeV, we observe one event, consistent with the expected background of 0.13 ± 0.03 events and with the predicted standard model ZZ and Zγ* production of 1.71 ± 0.15 events. We set an upper limit on the ZZ and Zγ* cross section of 4.4 pb at the 95% C.L. We also derive limits on anomalous neutral trilinear ZZZ and ZZγ* gauge couplings. The one-parameter 95% C.L. coupling limits with a form-factor scale Λ = 1.2 TeV are -0.28< ƒ₄₀^Z < 0.28, -0.31 < ƒ₅₀^z < 0.29, -0.26 < ƒ₄₀^γ < 0.26, and -0.30 < ƒ₅₀^γ < 0.28.