| Document(s) |
Web Page
Phys. Rev. Lett. 99, 242002 (2007)
[pdf]
hep-ex/0707.2374
Figures
|
| Contact(s) |
M. Albrow, B. Caron, A. Hamilton, B. Heinemann and J. Pinfold
|
| Abstract |
We have searched for exclusive 2-photon production in proton-antiproton collisions at sqrt{s} = 1.96 TeV, using 532 pb-1 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.
|
| Comments |
Last Update: April 2006 Dataset: 532 pb-1
|
|