# Search for Exclusive $\Gamma\Gamma$ Production in Hadron-Hadron Collisions

Abstract : We have searched for exclusive 2-photon production in proton-antiproton collisions at sqrt{s} = 1.96 TeV, using 532/pb of integrated luminosity taken by the Run II Collider Detector at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy E_T > 5 GeV and pseudorapidity |eta|<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with gamma-gamma, pi0-pi0, or eta-eta production. The probability that other processes fluctuate to 3 events or more is 1.7x10^-4. An upper limit on the cross section of p+pbar --> p+gamma-gamma+pbar is set at 410 fb with 95% confidence level.
Document type :
Journal articles
Complete list of metadata

http://hal.in2p3.fr/in2p3-00198452
Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Monday, December 17, 2007 - 12:51:48 PM
Last modification on : Wednesday, January 26, 2022 - 3:42:00 AM

### Citation

T. Aaltonen, A. Abulencia, J. Adelman, T. Affolder, T. Akimoto, et al.. Search for Exclusive $\Gamma\Gamma$ Production in Hadron-Hadron Collisions. Physical Review Letters, American Physical Society, 2007, 99, pp.242002. ⟨10.1103/PhysRevLett.99.242002⟩. ⟨in2p3-00198452⟩

Record views