Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for exclusive Z boson production and observation of high mass
  ppbar->gammagamma->p+ll+pbar events in ppbar collisions at sqrt(s) = 1.96 TeV   We present a search for exclusive Z boson production in proton-antiproton
collisions at sqrt(s) = 1.96 TeV, using the CDF II detector at Fermilab. We
observe no exclusive Z->ll candidates and place the first upper limit on the
exclusive Z cross section in hadron collisions, sigma(exclu) < 0.96 pb at 95%
confidence level. In addition, we observe eight candidate exclusive dilepton
events from the quantum electrodynamic process ppbar->gammagamma->p+ll+pbar,
and measure the cross section for M(ll) > 40 GeV/c2 and |eta(l)| < 4 to be
sigma = 0.24^{+0.13}_{-0.10} pb, which is the first measurement for this mass
range and is consistent with the standard model prediction.

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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin