Search for Exclusive Z-Boson Production and Observation of High-Mass pp¯pγγp¯pl+lp¯ Events in pp¯ Collisions at s=1.96TeV

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 102, 222002 – Published 4 June 2009

Abstract

This Letter presents a search for exclusive Z boson production in proton-antiproton collisions at s=1.96TeV, using the CDF II detector. No exclusive Zl+l candidates are observed and the first upper limit on the exclusive Z cross section in hadron collisions is found to be σexcl(Z)<0.96pb at 95% confidence level. In addition, eight candidate exclusive dilepton events from the process pp¯pγγp¯pl+lp¯ are observed, and a measurement of the cross section for Mll>40GeV/c2 and |ηl|<4 is found to be σ=0.240.10+0.13pb, which is consistent with the standard model prediction.

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  • Received 18 February 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.222002

©2009 American Physical Society

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Vol. 102, Iss. 22 — 5 June 2009

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