Search for exclusive γγ production in hadron-hadron collisions

Authors

T. Aaltonen, Helsingin Yliopisto
A. Abulencia, University of Illinois Urbana-Champaign
J. Adelman, The Enrico Fermi Institute
T. Affolder, University of California, Santa Barbara
T. Akimoto, University of Tsukuba
M. G. Albrow, Fermi National Accelerator Laboratory
S. Amerio, Università degli Studi di Padova
D. Amidei, University of Michigan, Ann Arbor
A. Anastassov, Rutgers University–New Brunswick
K. Anikeev, Fermi National Accelerator Laboratory
A. Annovi, INFN, Laboratori Nazionali Di Frascati
J. Antos, Univerzita Komenského v Bratislave
M. Aoki, University of Tsukuba
G. Apollinari, Fermi National Accelerator Laboratory
T. Arisawa, Waseda University
A. Artikov, Joint Institute for Nuclear Research, Dubna
W. Ashmanskas, Fermi National Accelerator Laboratory
A. Attal, Universitat Autònoma de Barcelona
A. Aurisano, Texas A&M University
F. Azfar, University of Oxford
P. Azzi-Bacchetta, Università degli Studi di Padova
P. Azzurri, Università di Pisa
N. Bacchetta, Università degli Studi di Padova
W. Badgett, Fermi National Accelerator Laboratory
A. Barbaro-Galtieri, Lawrence Berkeley National Laboratory
V. E. Barnes, Purdue University
B. A. Barnett, Johns Hopkins University
S. Baroiant, University of California, Davis

Document Type

Article

Publication Date

12-14-2007

Abstract

We have searched for exclusive γγ production in proton-antiproton collisions at s=1.96TeV, using 532pb-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>5GeV and pseudorapidity |η|<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with γγ, π0π0, or ηη production. The probability that other processes fluctuate to 3 events is 1.7×10-4. An upper limit on the cross section of pp̄→p+γγ+p̄ production is set at 410 fb with 95% confidence level. © 2007 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

Recommended Citation

Aaltonen, T., Abulencia, A., Adelman, J., Affolder, T., Akimoto, T., Albrow, M., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Azzi-Bacchetta, P., Azzurri, P., Bacchetta, N., Badgett, W., Barbaro-Galtieri, A., Barnes, V., Barnett, B., & Baroiant, S. (2007). Search for exclusive γγ production in hadron-hadron collisions. Physical Review Letters, 99 (24) https://doi.org/10.1103/PhysRevLett.99.242002