Observation of Exclusive Gamma Gamma Production in p pbar Collisions at sqrt{s}=1.96 TeV
Creators: name: CDF Collaboration
name: Aaltonen, T.
name: Albrow, M. G.
name: González, B. Álvarez
name: Amerio, S.
name: Amidei, D.
name: Anastassov, A.
name: Annovi, A.
name: Antos, J.
name: Apollinari, G.
name: Appel, J. A.
name: Arisawa, T.
name: Artikov, A.
name: Asaadi, J.
name: Ashmanskas, W.
name: Auerbach, B.
name: Aurisano, A.
name: Azfar, F.
name: Badgett, W.
name: Bae, T.
name: Barbaro-Galtieri, A.
name: Barnes, V. E.
name: Barnett, B. A.
name: Barria, P.
name: Bartos, P.
name: Bauce, M.
name: Bedeschi, F.
name: Behari, S.
name: Bellettini, G.
name: Bellinger, J.
name: Benjamin, D.
name: Beretvas, A.
name: Bhatti, A.
name: Bisello, D.
name: Bizjak, I.
name: Bland, K. R.
name: Blumenfeld, B.
name: Bocci, A.
name: Bodek, A.
name: Bortoletto, D.
name: Boudreau, J.
name: Boveia, A.
name: Brigliadori, L.
name: Bromberg, C.
name: Brucken, E.
name: Budagov, J.
name: Budd, H. S.
name: Burkett, K.
name: Busetto, G.
name: Bussey, P.
name: Buzatu, A.
name: Calamba, A.
name: Calancha, C.
name: Camarda, S.
name: Campanelli, M.
name: Campbell, M.
name: Canelli, F.
name: Carls, B.
name: Carlsmith, D.
name: Carosi, R.
name: Carrillo, S.
name: Carron, S.
name: Casal, B.
name: Casarsa, M.
name: Castro, A.
name: Catastini, P.
name: Cauz, D.
name: Cavaliere, V.
name: Cavalli-Sforza, M.
name: Cerri, A.
name: Cerrito, L.
name: Chen, Y. C.
name: Chertok, M.
name: Chiarelli, G.
name: Chlachidze, G.
name: Chlebana, F.
name: Cho, K.
name: Chokheli, D.
name: Chung, W. H.
name: Chung, Y. S.
name: Ciocci, M. A.
name: Clark, A.
name: Clarke, C.
name: Compostella, G.
name: Convery, M. E.
name: Conway, J.
name: Corbo, M.
name: Cordelli, M.
name: Cox, C. A.
name: Cox, D. J.
name: Crescioli, F.
name: Cuevas, J.
name: Culbertson, R.
name: Dagenhart, D.
name: d'Ascenzo, N.
name: Datta, M.
name: de Barbaro, P.
name: Dell'Orso, M.
name: Demortier, L.
name: Deninno, M.
name: Devoto, F.
name: d'Errico, M.
name: Di Canto, A.
name: Di Ruzza, B.
name: Dittmann, J. R.
name: D'Onofrio, M.
name: Donati, S.
name: Dong, P.
name: Dorigo, M.
name: Dorigo, T.
name: Ebina, K.
name: Elagin, A.
name: Eppig, A.
name: Erbacher, R.
name: Errede, S.
name: Ershaidat, N.
name: Eusebi, R.
name: Farrington, S.
name: Feindt, M.
name: Fernandez, J. P.
name: Field, R.
name: Flanagan, G.
name: Forrest, R.
name: Frank, M. J.
name: Franklin, M.
name: Freeman, J. C.
name: Funakoshi, Y.
name: Furic, I.
name: Gallinaro, M.
name: Garcia, J. E.
name: Garfinkel, A. F.
name: Garosi, P.
name: Gerberich, H.
name: Gerchtein, E.
name: Giagu, S.
name: Giakoumopoulou, V.
name: Giannetti, P.
name: Gibson, K.
name: Ginsburg, C. M.
name: Giokaris, N.
name: Giromini, P.
name: Giurgiu, G.
name: Glagolev, V.
name: Glenzinski, D.
name: Gold, M.
name: Goldin, D.
name: Goldschmidt, N.
name: Golossanov, A.
name: Gomez, G.
name: Gomez-Ceballos, G.
name: Goncharov, M.
name: González, O.
name: Gorelov, I.
name: Goshaw, A. T.
name: Goulianos, K.
name: Grinstein, S.
name: Grosso-Pilcher, C.
name: Group, R. C.
name: da Costa, J. Guimaraes
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name: Halkiadakis, E.
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name: Happacher, F.
name: Hara, K.
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name: Harr, R. F.
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name: Herndon, M.
name: Hewamanage, S.
name: Hocker, A.
name: Hopkins, W.
name: Horn, D.
name: Hou, S.
name: Hughes, R. E.
name: Hurwitz, M.
name: Husemann, U.
name: Hussain, N.
name: Hussein, M.
name: Huston, J.
name: Introzzi, G.
name: Iori, M.
name: Ivanov, A.
name: James, E.
name: Jang, D.
name: Jayatilaka, B.
name: Jeon, E. J.
name: Jindariani, S.
name: Jones, M.
name: Joo, K. K.
name: Jun, S. Y.
name: Junk, T. R.
name: Kamon, T.
name: Karchin, P. E.
name: Kasmi, A.
name: Kato, Y.
name: Ketchum, W.
name: Keung, J.
name: Khotilovich, V.
name: Kilminster, B.
name: Kim, D. H.
name: Kim, H. S.
name: Kim, J. E.
name: Kim, M. J.
name: Kim, S. B.
name: Kim, S. H.
name: Kim, Y. K.
name: Kim, Y. J.
name: Kimura, N.
name: Kirby, M.
name: Klimenko, S.
name: Knoepfel, K.
name: Kondo, K.
name: Kong, D. J.
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name: Kreps, M.
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name: Laasanen, A. T.
name: Lami, S.
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name: Lander, R. L.
name: Lannon, K.
name: Lath, A.
name: Latino, G.
name: LeCompte, T.
name: Lee, E.
name: Lee, H. S.
name: Lee, J. S.
name: Lee, S. W.
name: Leo, S.
name: Leone, S.
name: Lewis, J. D.
name: Limosani, A.
name: Lin, C. -J.
name: Lindgren, M.
name: Lipeles, E.
name: Lister, A.
name: Litvintsev, D. O.
name: Liu, C.
name: Liu, H.
name: Liu, Q.
name: Liu, T.
name: Lockwitz, S.
name: Loginov, A.
name: Lucchesi, D.
name: Lueck, J.
name: Lujan, P.
name: Lukens, P.
name: Lungu, G.
name: Lys, J.
name: Lysak, R.
name: Madrak, R.
name: Maeshima, K.
name: Maestro, P.
name: Malik, S.
name: Manca, G.
name: Manousakis-Katsikakis, A.
name: Margaroli, F.
name: Marino, C.
name: Martínez, M.
name: Mastrandrea, P.
name: Matera, K.
name: Mattson, M. E.
name: Mazzacane, A.
name: Mazzanti, P.
name: McFarland, K. S.
name: McIntyre, P.
name: McNulty, R.
name: Mehta, A.
name: Mehtala, P.
name: Mesropian, C.
name: Miao, T.
name: Mietlicki, D.
name: Mitra, A.
name: Miyake, H.
name: Moed, S.
name: Moggi, N.
name: Mondragon, M. N.
name: Moon, C. S.
name: Moore, R.
name: Morello, M. J.
name: Morlock, J.
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Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We have observed exclusive γγproduction in proton-antiproton collisions at \sqrt{s}=1.96 TeV, using data from 1.11 \pm 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 E_T &gt; 2.5 GeV and pseudorapidity |η| &lt; 1.0, with no other particles detected in -7.4 &lt; η&lt; +7.4. The two showers have similar E_T and azimuthal angle separation Δϕ\sim π; 34 events have two charged particle tracks, consistent with the QED process p \bar{p} to p + e^+e^- + \bar{p} by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive π^0π^0 is consistent with zero and is &lt; 15 at 95% C.L. The cross section for p\bar{p} to p+γγ+\bar{p} with |η(γ)| &lt; 1.0 and E_T(γ) &gt; 2.5$ GeV is 2.48^{+0.40}_{-0.35}(stat)^{+0.40}_{-0.51}(syst) pb.
description: 7 pages, 4 figures