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Observation of Exclusive Gamma Gamma Production in p pbar Collisions at sqrt{s}=1.96 TeV

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arxiv 1112.0858 v3 pith:2DULXBKN submitted 2011-12-05 hep-ex

Observation of Exclusive Gamma Gamma Production in p pbar Collisions at sqrt{s}=1.96 TeV

CDF Collaboration: T. Aaltonen , M.G. Albrow , B. \'Alvarez Gonz\'alez , S. Amerio , D. Amidei , A. Anastassov , A. Annovi , J. Antos
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G. Apollinari J.A. Appel T. Arisawa A. Artikov J. Asaadi W. Ashmanskas B. Auerbach A. Aurisano F. Azfar W. Badgett T. Bae A. Barbaro-Galtieri V.E. Barnes B.A. Barnett P. Barria P. Bartos M. Bauce F. Bedeschi S. Behari G. Bellettini J. Bellinger D. Benjamin A. Beretvas A. Bhatti D. Bisello I. Bizjak K.R. Bland B. Blumenfeld A. Bocci A. Bodek D. Bortoletto J. Boudreau A. Boveia L. Brigliadori C. Bromberg E. Brucken J. Budagov H.S. Budd K. Burkett G. Busetto P. Bussey A. Buzatu A. Calamba C. Calancha S. Camarda M. Campanelli M. Campbell F. Canelli B. Carls D. Carlsmith R. Carosi S. Carrillo S. Carron B. Casal M. Casarsa A. Castro P. Catastini D. Cauz V. Cavaliere M. Cavalli-Sforza A. Cerri L. Cerrito Y.C. Chen M. Chertok G. Chiarelli G. Chlachidze F. Chlebana K. Cho D. Chokheli W.H. Chung Y.S. Chung M.A. Ciocci A. Clark C. Clarke G. Compostella M.E. Convery J. Conway M.Corbo M. Cordelli C.A. Cox D.J. Cox F. Crescioli J. Cuevas R. Culbertson D. Dagenhart N. d'Ascenzo M. Datta P. de Barbaro M. Dell'Orso L. Demortier M. Deninno F. Devoto M. d'Errico A. Di Canto B. Di Ruzza J.R. Dittmann M. D'Onofrio S. Donati P. Dong M. Dorigo T. Dorigo K. Ebina A. Elagin A. Eppig R. Erbacher S. Errede N. Ershaidat R. Eusebi S. Farrington M. Feindt J.P. Fernandez R. Field G. Flanagan R. Forrest M.J. Frank M. Franklin J.C. Freeman Y. Funakoshi I. Furic M. Gallinaro J.E. Garcia A.F. Garfinkel P. Garosi H. Gerberich E. Gerchtein S. Giagu V. Giakoumopoulou P. Giannetti K. Gibson C.M. Ginsburg N. Giokaris P. Giromini G. Giurgiu V. Glagolev D. Glenzinski M. Gold D. Goldin N. Goldschmidt A. Golossanov G. Gomez G. Gomez-Ceballos M. Goncharov O. Gonz\'alez I. Gorelov A.T. Goshaw K. Goulianos S. Grinstein C. Grosso-Pilcher R.C. Group J. Guimaraes da Costa S.R. Hahn E. Halkiadakis A. Hamaguchi J.Y. Han F. Happacher K. Hara D. Hare M. Hare R.F. Harr K. Hatakeyama C. Hays M. Heck J. Heinrich M. Herndon S. Hewamanage A. Hocker W. Hopkins D. Horn S. Hou R.E. Hughes M. Hurwitz U. Husemann N. Hussain M. Hussein J. Huston G. Introzzi M. Iori A. Ivanov E. James D. Jang B. Jayatilaka E.J. Jeon S. Jindariani M. Jones K.K. Joo S.Y. Jun T.R. Junk T. Kamon P.E. Karchin A. Kasmi Y. Kato W. Ketchum J. Keung V. Khotilovich B. Kilminster D.H. Kim H.S. Kim J.E. Kim M.J. Kim S.B. Kim S.H. Kim Y.K. Kim Y.J. Kim N. Kimura M. Kirby S. Klimenko K. Knoepfel K. Kondo D.J. Kong J. Konigsberg A.V. Kotwal M. Kreps J. Kroll D. Krop M. Kruse V. Krutelyov T. Kuhr M. Kurata S. Kwang A.T. Laasanen S. Lami S. Lammel M. Lancaster R.L. Lander K. Lannon A. Lath G. Latino T. LeCompte E. Lee H.S. Lee J.S. Lee S.W. Lee S. Leo S. Leone J.D. Lewis A. Limosani C.-J. Lin M. Lindgren E. Lipeles A. Lister D.O. Litvintsev C. Liu H. Liu Q. Liu T. Liu S. Lockwitz A. Loginov D. Lucchesi J. Lueck P. Lujan P. Lukens G. Lungu J. Lys R. Lysak R. Madrak K. Maeshima P. Maestro S. Malik G. Manca A. Manousakis-Katsikakis F. Margaroli C. Marino M. Mart\'inez P. Mastrandrea K. Matera M.E. Mattson A. Mazzacane P. Mazzanti K.S. McFarland P. McIntyre R. McNulty A. Mehta P. Mehtala C. Mesropian T. Miao D. Mietlicki A. Mitra H. Miyake S. Moed N. Moggi M.N. Mondragon C.S. Moon R. Moore M.J. Morello J. Morlock P. Movilla Fernandez A. Mukherjee Th. Muller P. Murat M. Mussini J. Nachtman Y. Nagai J. Naganoma I. Nakano A. Napier J. Nett C. Neu M.S. Neubauer J. Nielsen L. Nodulman S.Y. Noh O. Norniella L. Oakes S.H. Oh Y.D. Oh I. Oksuzian T. Okusawa R. Orava L. Ortolan S. Pagan Griso C. Pagliarone E. Palencia V. Papadimitriou A.A. Paramonov J. Patrick G. Pauletta M. Paulini C. Paus D.E. Pellett A. Penzo T.J. Phillips G. Piacentino E. Pianori J. Pilot K. Pitts C. Plager L. Pondrom S. Poprocki K. Potamianos F. Prokoshin A. Pranko F. Ptohos G. Punzi A. Rahaman V. Ramakrishnan N. Ranjan I. Redondo P. Renton M. Rescigno T. Riddick F. Rimondi L. Ristori A. Robson T. Rodrigo T. Rodriguez E. Rogers S. Rolli R. Roser F. Ruffini A. Ruiz J. Russ V. Rusu A. Safonov W.K. Sakumoto Y. Sakurai L. Santi K. Sato V. Saveliev A. Savoy-Navarro P. Schlabach A. Schmidt E.E. Schmidt T. Schwarz L. Scodellaro A. Scribano F. Scuri S. Seidel Y. Seiya A. Semenov F. Sforza S.Z. Shalhout T. Shears P.F. Shepard M. Shimojima M. Shochet I. Shreyber-Tecker A. Simonenko P. Sinervo K. Sliwa J.R. Smith F.D. Snider A. Soha V. Sorin H. Song P. Squillacioti M. Stancari R. St. Denis B. Stelzer O. Stelzer-Chilton D. Stentz J. Strologas G.L. Strycker Y. Sudo A. Sukhanov I. Suslov K. Takemasa Y. Takeuchi J. Tang M. Tecchio P.K. Teng J. Thom J. Thome G.A. Thompson E. Thomson D. Toback S. Tokar K. Tollefson T. Tomura D. Tonelli S. Torre D. Torretta P. Totaro M. Trovato F. Ukegawa S. Uozumi A. Varganov F. V\'azquez G. Velev C. Vellidis M. Vidal I. Vila R. Vilar J. Viz\'an M. Vogel G. Volpi P. Wagner R.L. Wagner T. Wakisaka R. Wallny S.M. Wang A. Warburton D. Waters W.C. Wester III D. Whiteson A.B. Wicklund E. Wicklund S. Wilbur F. Wick H.H. Williams J.S. Wilson P. Wilson B.L. Winer P. Wittich S. Wolbers H. Wolfe T. Wright X. Wu Z. Wu K. Yamamoto D. Yamato T. Yang U.K. Yang Y.C. Yang W.-M. Yao G.P. Yeh K. Yi J. Yoh K. Yorita T. Yoshida G.B. Yu I. Yu S.S. Yu J.C. Yun A. Zanetti Y. Zeng C. Zhou S. Zucchelli
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classification hep-ex
keywords gammaeventsexclusivechargedcollisionsconsistentproductionshowers
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We have observed exclusive \gamma\gamma production 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 > 2.5 GeV and pseudorapidity |\eta| < 1.0, with no other particles detected in -7.4 < \eta < +7.4. The two showers have similar E_T and azimuthal angle separation \Delta\phi \sim \pi; 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 \pi^0\pi^0 is consistent with zero and is < 15 at 95% C.L. The cross section for p\bar{p} to p+\gamma\gamma+\bar{p} with |\eta(\gamma)| < 1.0 and E_T(\gamma) > 2.5$ GeV is 2.48^{+0.40}_{-0.35}(stat)^{+0.40}_{-0.51}(syst) pb.

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