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Observation of Exclusive γγ Production in pp Collisions at √s=1.96  TeV

CollaborationWith : Clark, Allan Geoffrey / Garcia Navarro, Jose Enrique / Lister, Alison / Wu, Xin
Published in Physical Review Letters. 2012, vol. 108, no. 08, p. 081801
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 pp→p+e+e−+p 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 pp→p+γγ+p with |η(γ)|<1.0 and ET(γ)>2.5  GeV is 2.48+0.40−0.35(stat)+0.40−0.51(syst)  pb.
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CDF COLLABORATION. Observation of Exclusive γγ Production in pp Collisions at √s=1.96  TeV. In: Physical Review Letters, 2012, vol. 108, n° 08, p. 081801. doi: 10.1103/PhysRevLett.108.081801 https://archive-ouverte.unige.ch/unige:38795

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Deposited on : 2014-07-21

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