We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 TeV, using data from (1.11 +/- 0.07) fb(-1) integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy E-T > 2.5 GeV and pseudorapidity |eta| < 1.0, with no other particles detected in -7.4 < eta < +7.4. The two showers have similar E-T and azimuthal angle separation Delta phi ~ pi; 34 events have two charged particle tracks, consistent with the QED process p(p)over bar -> p + e(+)e(-) + (p) over bar by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive pi(0)pi(0) is consistent wi...
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive {gamma} production in proton-antiproton collisions at {radical}s = 1.96 T...
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 T...
We have observed exclusive {gamma} production in proton-antiproton collisions at {radical}s = 1.96 T...
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....
We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1....