Observation of diffractive J/psi production at the Fermilab Tevatron.

A A Affolder ,K Sliwa,S Errede,Y Morita,K Kurino,S Murgia,P Tamburello,D Dagenhart,G Introzzi,M P Schmidt,D Errede,F Happacher,J Proudfoot,M Bishai,L Nodulman,A B Wicklund,M Garcia-Sciveres,P Amaral,N Bruner,T Handa,D O Litvintsev,E Wicklund,R Roser,J Done,A D Hardman,A Artikov,C I Ciobanu,L Holloway,H Kasha,R Handler,Q Fan,M Binkley,O Lobban,A Rakitine,L Malferrari,E E Schmidt,Y Seiya,B A Barnett,F Dejongh,D Partos,T Kaneko,J Boudreau,J Wyss,J P Berge,J Huston,G W Foster,A S Thompson,G Piacentino,E Buckley-Geer,W Hao,D Tonelli,J Steele,F D Snider,M Loreti,N Eddy,N Moggi,L Groer,Y D Oh,A Munar,C Neu,W C Wester,E Kovacs,B Tannenbaum,K Tollefson,Y Kato,H H Williams,A Meyer,R D Field,F Spinella,A Bhatti,M Riveline,R D Kennedy,P Mazzanti,W Ashmanskas,J Lancaster,K Kelley,J Yoh,S Rolli,M L Chu,R Madrak,F Ptohos,W Carithers,M Menguzzato,G Pauletta,C Pagliarone,D Neuberger,Y Gotra,P Gatti,R Kephart,W Orejudos,A T Laasanen,W Caskey,P K Teng,P Wilson,M Lancaster,A Ribon,M Campbell,F Palmonari,M Tecchio,J E Elias,I Fiori,R Cropp,A Akopian,M Barone,S Lusin,K Karr,G Busetto,A Ruiz,Y Bonushkin,K Takikawa,J Patrick,R G Feild,H Nakada,R Oishi,M J Kim,H S Budd,M Cordelli,J Lys,R L Wagner,Z Wan,A Solodsky,F Azfar,T J Phillips,P Yeh,S H Oh,C Mesropian,G Pope,A Menzione,Y Iwata,S Zucchelli,T Miao,A Gallas,A Tollestrup,P Murat,C Holck,G Veramendi,H Minato,K D Hoffman,S Tether,J Iwai,A Connolly,C Grosso-Pilcher,H Toyoda,T Ohsugi,T Takano,P F Derwent,P De Barbaro,W Bokhari,F Zetti,D Lucchesi,K Goulianos,J Conway,D Winn,S Wolinski,V Nagaslaev,T Devlin,L Pescara,D Toback,A T Goshaw,D Waters,F Rimondi,T Wilkes,G Guillian,M Franklin,M Lindgren,S Vejcik,G P Yeh,R E Blair,T Speer,R Vilar,M Shimojima,T Asakawa,F Semeria,N B Wallace,M Mangano,G Punzi,E Brubaker,M Von Der Mey,S E Kuhlmann,M Jones,E Engels,T Okusawa,T Moulik,L Demortier,S Klimenko,V Papadimitriou,C Haber,S Donati,J Cranshaw,Y S Chung,C Yosef,S Tkaczyk,J Wolinski,J Valls,L Pondrom,J Budagov,D W Gerdes,M Guenther,S Galeotti,K S Mcfarland,B Flaugher,A Korn,G Bauer,T Shibayama,L Rosenson,W H Bell,S R Hahn,D Amidei,P Koehn,D Khazins,A Semenov,R Vidal,T A Keaffaber,W J Robertson,N Lai,P Sinervo,S Miscetti,A Bodek,P Lukens,M Gold,S Cabrera,K L Byrum,P Mcintyre,P F Shepard,S Baroiant,C Bromberg,A Byon-Wagner,G Velev,J D Lewis,S Bailey,D Wolinski,A Scribano,F Strumia,W K Sakumoto,L Santi,S H Kim,P Schlabach,S Wolbers,D Cauz,S Lami,L Christofek,T Kuwabara,T Suzuki,D Vucinic,J B Liu,H Akimoto,G Chlachidze,G Martignon,A J Slaughter,D Reher,A Mukherjee,S Segler,T Vaiciulis,K Anikeev,J Spalding,S Waschke,O Pukhov,R Culbertson,J Siegrist,A Reichold,E James,K Kondo,M Mishina,S Belforte,S B Kim,S D’auria ,M T Cheng ,Tong Gao ,S C Seidel ,A Heiß ,H Wenzel,M Shapiro ,J Nachtman,F Chlebana,A Bocci,J Heinrich,Niu Huang ,S Van Den Brink,C Sánchez ,P T Chang,C Ferretti,Jorge F De Trocóniz ,M Albrow ,K Sumorok,F Bedeschi,K Maeshima,A Castro,R G Wagner,A Martín ,S Lammel,J Hauser,T Yoshida,Charles A Nelson ,D Benjamin,Y C Liu,D Carlsmith,J Friedman,E A Mckigney ,P Sphicas,S Leone,R Hughes,P Savard,M Tanaka,A Robinson,J P Fernández ,R Rossin,C Green,B F L Ward ,B L Winer,J W Berryhill ,B Kilminster,J Matthews ,A Zanetti,S Blusk ,J S Miller,M E Convery,Th Müller ,D Saltzberg,M D’onofrio ,A Scott,H Sato,Y C Chen,M Kirby,J Goldstein,A Dominguez,M Chertok,R Thurman‐Keup ,R Paoletti,J Strologas,C Smith,L Ristori,J Huth,C Newman-Holmes,S Nahn,R M Harris,G Latino,R St Denis,J R Bensinger ,R Erbacher,A Barbaro‐Galtieri ,P Giannetti,D Bortoletto,M Popovic,A Cerri,E F Moore ,M Herndon,T Ohmoto,I Volobouev,P Maksimović ,R Takashima,L Scodellaro,G Mitselmakher,B J Kim,J Chapman,Michael Henry Schmitt ,P Singh,J Dittmann ,V E Barnes,C Hall,J Antos̆ ,R Lander,J Tseng,J Freeman,C Chen,H Ikeda,M Gallinaro,P S Chang,R J Tesarek ,J Olsen,A M Lee,A Sansoni,K Bloom,T Arisawa,G Bolla,J Königsberg ,U Joshi,T Watts,Y K Kim,P Tipton,W Riegler,T Dorigo,C Hill,A Stefanini,N Turini,И Чириков-Зорин ,H Kambara,X Wu,A Safonov,G Chiarelli,M Mariotti,R Moore,T Kikuchi,L Lyons,J Bellinger,D Stuart,R Miller,K Burkett,P Calafiura,R M Haas,M Shochet,C Y.p Ngan ,D Glenzinskí ,G Apollinari,M Paulini,H S Kim,C Blocker,I Gorelov,D H Kim,Takashi Watanabe ,A Sidoti,V Glagolev,K Borras,M Dell’orso ,A Lath,B Blumenfeld,D Pellett,H Bachacou,A Beretvas,I Vila,C Paus,R Hollebeek,M Deninno,K Lee,T Rodrigo,M Brozović ,J Loken,G Grim,A Roy,T Kamon,A Korytov,J Incandela,L Kirsch,A W Chan,K Terashi,K Pitts ,A Clark ,D Bisello,P Azzi ,S Dell’agnello ,N S Lockyer ,M Kirk,K Hatakeyama,I K Furic ,C Wang,A Brandl,F Hartmann,J Carlson,K Hara,I Yu,F Ratnikov,M Kelly,Ph Gris ,J Mayer,M Spiropulu,J Kroll,R Webb,G Bellettini,N Bacchetta,Y Fukui,M J Wang,L Spiegel,A Pompoš ,M C Kruse ,T M Liss,A Sill,A F Garfinkel,W Trischuk,T K Nelson ,M Mulhearn,S D Worm ,Yu Z ,F Prokoshin,F Ukegawa,I Nakano,A Nomerotski,J Guimarães Da Costa ,W-M Yao ,K Einsweiler,T Shah,S S Yu ,T Lecompte

doi:10.1103/physrevlett.87.241802

Abstract

We report the first observation of diffractive J/psi(--> mu+mu-) production in pp collisions at root square[s] = 1.8 TeV. Diffractive events are identified by their rapidity gap signature. In a sample of events with two muons of transverse momentum p(mu)T>2 GeV/c within the pseudorapidity region /eta/ < 1.0, the ratio of diffractive to total J/psi production rates is found to be R(J/psi) = [1.45 +/- 0.25]%. The ratio R(J/psi)(x) is presented as a function of x-Bjorken. By combining it with our previously measured corresponding ratio R(jj)(x) for diffractive dijet production, we extract a value of 0.59 +/- 0.15 for the gluon fraction of the diffractive structure function of the proton.

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