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Phys Rev Lett. 2012 Feb 24;108(8):081801. Epub 2012 Feb 22.

Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV.

Aaltonen T, Albrow MG, Alvarez González B, Amerio S, Amidei D, Anastassov A, Annovi A, Antos J, Apollinari G, Appel JA, Arisawa T, Artikov A, Asaadi J, Ashmanskas W, Auerbach B, Aurisano A, Azfar F, Badgett W, Bae T, Barbaro-Galtieri A, Barnes VE, Barnett BA, Barria P, Bartos P, Bauce M, Bedeschi F, Behari S, Bellettini G, Bellinger J, Benjamin D, Beretvas A, Bhatti A, Bisello D, Bizjak I, Bland KR, Blumenfeld B, Bocci A, Bodek A, Bortoletto D, Boudreau J, Boveia A, Brigliadori L, Bromberg C, Brucken E, Budagov J, Budd HS, Burkett K, Busetto G, Bussey P, Buzatu A, Calamba A, Calancha C, Camarda S, Campanelli M, Campbell M, Canelli F, Carls B, Carlsmith D, Carosi R, Carrillo S, Carron S, Casal B, Casarsa M, Castro A, Catastini P, Cauz D, Cavaliere V, Cavalli-Sforza M, Cerri A, Cerrito L, Chen YC, Chertok M, Chiarelli G, Chlachidze G, Chlebana F, Cho K, Chokheli D, Chung WH, Chung YS, Ciocci MA, Clark A, Clarke C, Compostella G, Convery ME, Conway J, Corbo M, Cordelli M, Cox CA, Cox DJ, Crescioli F, Cuevas J, Culbertson R, Dagenhart D, d'Ascenzo N, Datta M, de Barbaro P, Dell'Orso M, Demortier L, Deninno M, Devoto F, d'Errico M, Di Canto A, Di Ruzza B, Dittmann JR, D'Onofrio M, Donati S, Dong P, Dorigo M, Dorigo T, Ebina K, Elagin A, Eppig A, Erbacher R, Errede S, Ershaidat N, Eusebi R, Farrington S, Feindt M, Fernandez JP, Field R, Flanagan G, Forrest R, Frank MJ, Franklin M, Freeman JC, Funakoshi Y, Furic I, Gallinaro M, Garcia JE, Garfinkel AF, Garosi P, Gerberich H, Gerchtein E, Giagu S, Giakoumopoulou V, Giannetti P, Gibson K, Ginsburg CM, Giokaris N, Giromini P, Giurgiu G, Glagolev V, Glenzinski D, Gold M, Goldin D, Goldschmidt N, Golossanov A, Gomez G, Gomez-Ceballos G, Goncharov M, González O, Gorelov I, Goshaw AT, Goulianos K, Grinstein S, Grosso-Pilcher C, Group RC, Guimaraes da Costa J, Hahn SR, Halkiadakis E, Hamaguchi A, Han JY, Happacher F, Hara K, Hare D, Hare M, Harr RF, Hatakeyama K, Hays C, Heck M, Heinrich J, Herndon M, Hewamanage S, Hocker A, Hopkins W, Horn D, Hou S, Hughes RE, Hurwitz M, Husemann U, Hussain N, Hussein M, Huston J, Introzzi G, Iori M, Ivanov A, James E, Jang D, Jayatilaka B, Jeon EJ, Jindariani S, Jones M, Joo KK, Jun SY, Junk TR, Kamon T, Karchin PE, Kasmi A, Kato Y, Ketchum W, Keung J, Khotilovich V, Kilminster B, Kim DH, Kim HS, Kim JE, Kim MJ, Kim SB, Kim SH, Kim YK, Kim YJ, Kimura N, Kirby M, Klimenko S, Knoepfel K, Kondo K, Kong DJ, Konigsberg J, Kotwal AV, Kreps M, Kroll J, Krop D, Kruse M, Krutelyov V, Kuhr T, Kurata M, Kwang S, Laasanen AT, Lami S, Lammel S, Lancaster M, Lander RL, Lannon K, Lath A, Latino G, LeCompte T, Lee E, Lee HS, Lee JS, Lee SW, Leo S, Leone S, Lewis JD, Limosani A, Lin CJ, Lindgren M, Lipeles E, Lister A, Litvintsev DO, Liu C, Liu H, Liu Q, Liu T, Lockwitz S, Loginov A, Lucchesi D, Lueck J, Lujan P, Lukens P, Lungu G, Lys J, Lysak R, Madrak R, Maeshima K, Maestro P, Malik S, Manca G, Manousakis-Katsikakis A, Margaroli F, Marino C, Martínez M, Mastrandrea P, Matera K, Mattson ME, Mazzacane A, Mazzanti P, McFarland KS, McIntyre P, McNulty R, Mehta A, Mehtala P, Mesropian C, Miao T, Mietlicki D, Mitra A, Miyake H, Moed S, Moggi N, Mondragon MN, Moon CS, Moore R, Morello MJ, Morlock J, Movilla Fernandez P, Mukherjee A, Muller T, Murat P, Mussini M, Nachtman J, Nagai Y, Naganoma J, Nakano I, Napier A, Nett J, Neu C, Neubauer MS, Nielsen J, Nodulman L, Noh SY, Norniella O, Oakes L, Oh SH, Oh YD, Oksuzian I, Okusawa T, Orava R, Ortolan L, Pagan Griso S, Pagliarone C, Palencia E, Papadimitriou V, Paramonov AA, Patrick J, Pauletta G, Paulini M, Paus C, Pellett DE, Penzo A, Phillips TJ, Piacentino G, Pianori E, Pilot J, Pitts K, Plager C, Pondrom L, Poprocki S, Potamianos K, Prokoshin F, Pranko A, Ptohos F, Punzi G, Rahaman A, Ramakrishnan V, Ranjan N, Redondo I, Renton P, Rescigno M, Riddick T, Rimondi F, Ristori L, Robson A, Rodrigo T, Rodriguez T, Rogers E, Rolli S, Roser R, Ruffini F, Ruiz A, Russ J, Rusu V, Safonov A, Sakumoto WK, Sakurai Y, Santi L, Sato K, Saveliev V, Savoy-Navarro A, Schlabach P, Schmidt A, Schmidt EE, Schwarz T, Scodellaro L, Scribano A, Scuri F, Seidel S, Seiya Y, Semenov A, Sforza F, Shalhout SZ, Shears T, Shepard PF, Shimojima M, Shochet M, Shreyber-Tecker I, Simonenko A, Sinervo P, Sliwa K, Smith JR, Snider FD, Soha A, Sorin V, Song H, Squillacioti P, Stancari M, St Denis R, Stelzer B, Stelzer-Chilton O, Stentz D, Strologas J, Strycker GL, Sudo Y, Sukhanov A, Suslov I, Takemasa K, Takeuchi Y, Tang J, Tecchio M, Teng PK, Thom J, Thome J, Thompson GA, Thomson E, Toback D, Tokar S, Tollefson K, Tomura T, Tonelli D, Torre S, Torretta D, Totaro P, Trovato M, Ukegawa F, Uozumi S, Varganov A, Vázquez F, Velev G, Vellidis C, Vidal M, Vila I, Vilar R, Vizán J, Vogel M, Volpi G, Wagner P, Wagner RL, Wakisaka T, Wallny R, Wang SM, Warburton A, Waters D, Wester WC 3rd, Whiteson D, Wicklund AB, Wicklund E, Wilbur S, Wick F, Williams HH, Wilson JS, Wilson P, Winer BL, Wittich P, Wolbers S, Wolfe H, Wright T, Wu X, Wu Z, Yamamoto K, Yamato D, Yang T, Yang UK, Yang YC, Yao WM, Yeh GP, Yi K, Yoh J, Yorita K, Yoshida T, Yu GB, Yu I, Yu SS, Yun JC, Zanetti A, Zeng Y, Zhou C, Zucchelli S; CDF Collaboration.

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 E(T)>2.5 GeV and pseudorapidity |η|<1.0, with no other particles detected in -7.4<η<+7.4. The two showers have similar E(T) 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 π(0)π(0) 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 E(T)(γ)>2.5 GeV is 2.48(-0.35)(+0.40)(stat)(-0.51)(+0.40)(syst) pb.

PMID:
22463517
[PubMed]
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