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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/52034
Title: Observation of Exclusive γγ Production in pp̅ Collisions at √s=1.96  TeV
Authors: Aaltonen, T.; Álvarez González, B.; Casal, Bruno; Gómez, G.; Palencia, Enrique; Rodrigo, Teresa; Scodellaro, Luca; Vila, Iván; Vilar, Rocío; Vizán, J.; CDF Collaboration
Issue Date: 2012
Publisher: American Physical Society
Citation: Physical Review Letters 108(8): 081801 (2012)
Abstract: We have observed exclusive γγ production in proton-antiproton collisions at √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 ET>2.5  GeV and pseudorapidity |η|<1.0, with no other particles detected in -7.4<η<+7.4. The two showers have similar ET and azimuthal angle separation Δϕ∼π; 34 events have two charged particle tracks, consistent with the QED process pp̅ →p+e+e-+p̅ by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive π0π0 is consistent with zero and is <15 at 95% C.L. The cross section for pp̅ →p+γγ+p̅ with |η(γ)|<1.0 and ET(γ)>2.5  GeV is 2.48-0.35+0.40(stat)-0.51+0.40(syst)  pb.
Publisher version (URL): http://dx.doi.org/10.1103/PhysRevLett.108.081801
URI: http://hdl.handle.net/10261/52034
DOI: 10.1103/PhysRevLett.108.081801
Identifiers: doi: 10.1103/PhysRevLett.108.081801
issn: 0031-9007
e-issn: 1079-7114
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