This Letter presents a search for exclusive Z boson production in proton-antiproton collisions at √s=1.96 TeV, using the CDF II detector. No exclusive Z→l+l− candidates are observed and the first upper limit on the exclusive Z cross section in hadron collisions is found to be σexcl(Z)<0.96 pb at 95% confidence level. In addition, eight candidate exclusive dilepton events from the process ppbar→pγγpbar→pl+l−pbar are observed, and a measurement of the cross section for Mll>40 GeV/c^2 and |ηl|<4 is found to be σ=0.24+0.13−0.10 pb, which is consistent with the standard model prediction.
Search for Exclusive Z-Boson Production and Observation of High-Mass ppbar -> p gamma gamma pbar -> pl(+)l(-)pbar Events in ppbar Collisions at sqrt(s)=1.96 TeV
DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;
2009-01-01
Abstract
This Letter presents a search for exclusive Z boson production in proton-antiproton collisions at √s=1.96 TeV, using the CDF II detector. No exclusive Z→l+l− candidates are observed and the first upper limit on the exclusive Z cross section in hadron collisions is found to be σexcl(Z)<0.96 pb at 95% confidence level. In addition, eight candidate exclusive dilepton events from the process ppbar→pγγpbar→pl+l−pbar are observed, and a measurement of the cross section for Mll>40 GeV/c^2 and |ηl|<4 is found to be σ=0.24+0.13−0.10 pb, which is consistent with the standard model prediction.File in questo prodotto:
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