2007/07/31 by CDF Collaboration, T. Aaltonen, A. Abulencia +98 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.99.242002
published as Phys.Rev.Lett.99:242002,2007 · 7 pages, 2 figures. Submitted to Phys.Rev.Lett
arxiv created 2007/10/17 · openalex publication_date 2007/12/14 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We have searched for exclusive \ensuremathγ\ensuremathγ production in proton-antiproton collisions at √(s)=1.96 TeV, using 532 pb^\ensuremath-1 of integrated luminosity taken by the run II Collider Detector at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy ET>5 GeV and pseudorapidity |\ensuremathη|<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with \ensuremathγ\ensuremathγ, \ensuremathπ0\ensuremathπ0, or \ensuremathη\ensuremathη production. The probability that other processes fluctuate to \ensuremath≥3 events is 1.7\ifmmode×\else\texttimes\fi10^\ensuremath-4. An upper limit on the cross section of pp\ensuremath→p+\ensuremathγ\ensuremathγ+p production is set at 410 fb with 95% confidence level.