APS » Phys. Rev. Lett. » Volume 99 » Issue 24

T. Aaltonen,²³ A. Abulencia,²⁴ J. Adelman,¹³ T. Affolder,¹⁰ T. Akimoto,⁵⁵ M. G. Albrow,¹⁷ S. Amerio,⁴³ D. Amidei,³⁵ A. Anastassov,⁵² K. Anikeev,¹⁷ A. Annovi,¹⁹ J. Antos,¹⁴ M. Aoki,⁵⁵ G. Apollinari,¹⁷ T. Arisawa,⁵⁷ A. Artikov,¹⁵ W. Ashmanskas,¹⁷ A. Attal,³ A. Aurisano,⁵³ F. Azfar,⁴² P. Azzi-Bacchetta,⁴³ P. Azzurri,⁴⁶ N. Bacchetta,⁴³ W. Badgett,¹⁷ A. Barbaro-Galtieri,²⁹ V. E. Barnes,⁴⁸ B. A. Barnett,²⁵ S. Baroiant,⁷ V. Bartsch,³¹ G. Bauer,³³ P.-H. Beauchemin,⁶¹ F. Bedeschi,⁴⁶ S. Behari,²⁵ G. Bellettini,⁴⁶ J. Bellinger,⁵⁹ A. Belloni,³³ D. Benjamin,¹⁶ A. Beretvas,¹⁷ J. Beringer,²⁹ T. Berry,³⁰ A. Bhatti,⁵⁰ M. Binkley,¹⁷ D. Bisello,⁴³ I. Bizjak,³¹ R. E. Blair,² C. Blocker,⁶ B. Blumenfeld,²⁵ A. Bocci,¹⁶ A. Bodek,⁴⁹ V. Boisvert,⁴⁹ G. Bolla,⁴⁸ A. Bolshov,³³ D. Bortoletto,⁴⁸ J. Boudreau,⁴⁷ A. Boveia,¹⁰ B. Brau,¹⁰ L. Brigliadori,⁵ C. Bromberg,³⁶ E. Brubaker,¹³ J. Budagov,¹⁵ H. S. Budd,⁴⁹ S. Budd,²⁴ K. Burkett,¹⁷ G. Busetto,⁴³ P. Bussey,²¹ A. Buzatu,⁶¹ K. L. Byrum,² S. Cabrera,¹⁶ M. Campanelli,²⁰ M. Campbell,³⁵ F. Canelli,¹⁷ A. Canepa,⁴⁵ S. Carrillo,¹⁸ D. Carlsmith,⁵⁹ B. Caron,³⁴ R. Carosi,⁴⁶ S. Carron,⁶¹ B. Casal,¹¹ M. Casarsa,⁵⁴ A. Castro,⁵ P. Catastini,⁴⁶ D. Cauz,⁵⁴ M. Cavalli-Sforza,³ A. Cerri,²⁹ L. Cerrito,³¹ S. H. Chang,²⁸ Y. C. Chen,¹ M. Chertok,⁷ G. Chiarelli,⁴⁶ G. Chlachidze,¹⁷ F. Chlebana,¹⁷ I. Cho,²⁸ K. Cho,²⁸ D. Chokheli,¹⁵ J. P. Chou,²² G. Choudalakis,³³ S. H. Chuang,⁵² K. Chung,¹² W. H. Chung,⁵⁹ Y. S. Chung,⁴⁹ M. Cilijak,⁴⁶ C. I. Ciobanu,²⁴ M. A. Ciocci,⁴⁶ A. Clark,²⁰ D. Clark,⁶ M. Coca,¹⁶ G. Compostella,⁴³ M. E. Convery,⁵⁰ J. Conway,⁷ B. Cooper,³¹ K. Copic,³⁵ M. Cordelli,¹⁹ G. Cortiana,⁴³ F. Crescioli,⁴⁶ C. Cuenca Almenar,⁷ J. Cuevas,¹¹ R. Culbertson,¹⁷ J. C. Cully,³⁵ S. DaRonco,⁴³ M. Datta,¹⁷ S. D'Auria,²¹ T. Davies,²¹ D. Dagenhart,¹⁷ P. de Barbaro,⁴⁹ S. De Cecco,⁵¹ A. Deisher,²⁹ G. De Lentdecker,⁴⁹ G. De Lorenzo,³ M. Dell'Orso,⁴⁶ F. Delli Paoli,⁴³ L. Demortier,⁵⁰ J. Deng,¹⁶ M. Deninno,⁵ D. De Pedis,⁵¹ P. F. Derwent,¹⁷ G. P. Di Giovanni,⁴⁴ C. Dionisi,⁵¹ B. Di Ruzza,⁵⁴ J. R. Dittmann,⁴ M. D'Onofrio,³ C. Dörr,²⁶ S. Donati,⁴⁶ P. Dong,⁸ J. Donini,⁴³ T. Dorigo,⁴³ S. Dube,⁵² J. Efron,³⁹ R. Erbacher,⁷ D. Errede,²⁴ S. Errede,²⁴ R. Eusebi,¹⁷ H. C. Fang,²⁹ S. Farrington,³⁰ I. Fedorko,⁴⁶ W. T. Fedorko,¹³ R. G. Feild,⁶⁰ M. Feindt,²⁶ J. P. Fernandez,³² R. Field,¹⁸ G. Flanagan,⁴⁸ R. Forrest,⁷ S. Forrester,⁷ M. Franklin,²² J. C. Freeman,²⁹ I. Furic,¹³ M. Gallinaro,⁵⁰ J. Galyardt,¹² J. E. Garcia,⁴⁶ F. Garberson,¹⁰ A. F. Garfinkel,⁴⁸ C. Gay,⁶⁰ H. Gerberich,²⁴ D. Gerdes,³⁵ S. Giagu,⁵¹ P. Giannetti,⁴⁶ K. Gibson,⁴⁷ J. L. Gimmell,⁴⁹ C. Ginsburg,¹⁷ N. Giokaris,¹⁵ M. Giordani,⁵⁴ P. Giromini,¹⁹ M. Giunta,⁴⁶ G. Giurgiu,²⁵ V. Glagolev,¹⁵ D. Glenzinski,¹⁷ M. Gold,³⁷ N. Goldschmidt,¹⁸ J. Goldstein,⁴² A. Golossanov,¹⁷ G. Gomez,¹¹ G. Gomez-Ceballos,³³ M. Goncharov,⁵³ O. González,³² I. Gorelov,³⁷ A. T. Goshaw,¹⁶ K. Goulianos,⁵⁰ A. Gresele,⁴³ S. Grinstein,²² C. Grosso-Pilcher,¹³ R. C. Group,¹⁷ U. Grundler,²⁴ J. Guimaraes da Costa,²² Z. Gunay-Unalan,³⁶ C. Haber,²⁹ K. Hahn,³³ S. R. Hahn,¹⁷ E. Halkiadakis,⁵² A. Hamilton,²⁰ B.-Y. Han,⁴⁹ J. Y. Han,⁴⁹ R. Handler,⁵⁹ F. Happacher,¹⁹ K. Hara,⁵⁵ D. Hare,⁵² M. Hare,⁵⁶ S. Harper,⁴² R. F. Harr,⁵⁸ R. M. Harris,¹⁷ M. Hartz,⁴⁷ K. Hatakeyama,⁵⁰ J. Hauser,⁸ C. Hays,⁴² M. Heck,²⁶ A. Heijboer,⁴⁵ B. Heinemann,²⁹ J. Heinrich,⁴⁵ C. Henderson,³³ M. Herndon,⁵⁹ J. Heuser,²⁶ D. Hidas,¹⁶ C. S. Hill,¹⁰ D. Hirschbuehl,²⁶ A. Hocker,¹⁷ A. Holloway,²² S. Hou,¹ M. Houlden,³⁰ S.-C. Hsu,⁹ B. T. Huffman,⁴² R. E. Hughes,³⁹ U. Husemann,⁶⁰ J. Huston,³⁶ J. Incandela,¹⁰ G. Introzzi,⁴⁶ M. Iori,⁵¹ A. Ivanov,⁷ B. Iyutin,³³ E. James,¹⁷ D. Jang,⁵² B. Jayatilaka,¹⁶ D. Jeans,⁵¹ E. J. Jeon,²⁸ S. Jindariani,¹⁸ W. Johnson,⁷ M. Jones,⁴⁸ K. K. Joo,²⁸ S. Y. Jun,¹² J. E. Jung,²⁸ T. R. Junk,²⁴ T. Kamon,⁵³ P. E. Karchin,⁵⁸ Y. Kato,⁴¹ Y. Kemp,²⁶ R. Kephart,¹⁷ U. Kerzel,²⁶ V. Khotilovich,⁵³ B. Kilminster,³⁹ D. H. Kim,²⁸ H. S. Kim,²⁸ J. E. Kim,²⁸ M. J. Kim,¹⁷ S. B. Kim,²⁸ S. H. Kim,⁵⁵ Y. K. Kim,¹³ N. Kimura,⁵⁵ L. Kirsch,⁶ S. Klimenko,¹⁸ M. Klute,³³ B. Knuteson,³³ B. R. Ko,¹⁶ K. Kondo,⁵⁷ D. J. Kong,²⁸ J. Konigsberg,¹⁸ A. Korytov,¹⁸ A. V. Kotwal,¹⁶ A. C. Kraan,⁴⁵ J. Kraus,²⁴ M. Kreps,²⁶ J. Kroll,⁴⁵ N. Krumnack,⁴ M. Kruse,¹⁶ V. Krutelyov,¹⁰ T. Kubo,⁵⁵ S. E. Kuhlmann,² T. Kuhr,²⁶ N. P. Kulkarni,⁵⁸ Y. Kusakabe,⁵⁷ S. Kwang,¹³ A. T. Laasanen,⁴⁸ S. Lai,⁶¹ S. Lami,⁴⁶ S. Lammel,¹⁷ M. Lancaster,³¹ R. L. Lander,⁷ K. Lannon,³⁹ A. Lath,⁵² G. Latino,⁴⁶ I. Lazzizzera,⁴³ T. LeCompte,² J. Lee,⁴⁹ J. Lee,²⁸ Y. J. Lee,²⁸ S. W. Lee,⁵³ R. Lefèvre,²⁰ N. Leonardo,³³ S. Leone,⁴⁶ S. Levy,¹³ J. D. Lewis,¹⁷ C. Lin,⁶⁰ C. S. Lin,¹⁷ M. Lindgren,¹⁷ E. Lipeles,⁹ A. Lister,⁷ D. O. Litvintsev,¹⁷ T. Liu,¹⁷ N. S. Lockyer,⁴⁵ A. Loginov,⁶⁰ M. Loreti,⁴³ R.-S. Lu,¹ D. Lucchesi,⁴³ P. Lujan,²⁹ P. Lukens,¹⁷ G. Lungu,¹⁸ L. Lyons,⁴² J. Lys,²⁹ R. Lysak,¹⁴ E. Lytken,⁴⁸ P. Mack,²⁶ D. MacQueen,⁶¹ R. Madrak,¹⁷ K. Maeshima,¹⁷ K. Makhoul,³³ T. Maki,²³ P. Maksimovic,²⁵ S. Malde,⁴² S. Malik,³¹ G. Manca,³⁰ A. Manousakis,¹⁵ F. Margaroli,⁵ R. Marginean,¹⁷ C. Marino,²⁶ C. P. Marino,²⁴ A. Martin,⁶⁰ M. Martin,²⁵ V. Martin,²¹ M. Martínez,³ R. Martínez-Ballarín,³² T. Maruyama,⁵⁵ P. Mastrandrea,⁵¹ T. Masubuchi,⁵⁵ H. Matsunaga,⁵⁵ M. E. Mattson,⁵⁸ R. Mazini,⁶¹ P. Mazzanti,⁵ K. S. McFarland,⁴⁹ P. McIntyre,⁵³ R. McNulty,³⁰ A. Mehta,³⁰ P. Mehtala,²³ S. Menzemer,¹¹ A. Menzione,⁴⁶ P. Merkel,⁴⁸ C. Mesropian,⁵⁰ A. Messina,³⁶ T. Miao,¹⁷ N. Miladinovic,⁶ J. Miles,³³ R. Miller,³⁶ C. Mills,¹⁰ M. Milnik,²⁶ A. Mitra,¹ G. Mitselmakher,¹⁸ A. Miyamoto,²⁷ S. Moed,²⁰ N. Moggi,⁵ B. Mohr,⁸ C. S. Moon,²⁸ R. Moore,¹⁷ M. Morello,⁴⁶ P. Movilla Fernandez,²⁹ J. Mülmenstädt,²⁹ A. Mukherjee,¹⁷ Th. Muller,²⁶ R. Mumford,²⁵ P. Murat,¹⁷ M. Mussini,⁵ J. Nachtman,¹⁷ A. Nagano,⁵⁵ J. Naganoma,⁵⁷ K. Nakamura,⁵⁵ I. Nakano,⁴⁰ A. Napier,⁵⁶ V. Necula,¹⁶ C. Neu,⁴⁵ M. S. Neubauer,⁹ J. Nielsen,²⁹ L. Nodulman,² O. Norniella,³ E. Nurse,³¹ S. H. Oh,¹⁶ Y. D. Oh,²⁸ I. Oksuzian,¹⁸ T. Okusawa,⁴¹ R. Oldeman,³⁰ R. Orava,²³ K. Osterberg,²³ C. Pagliarone,⁴⁶ E. Palencia,¹¹ V. Papadimitriou,¹⁷ A. Papaikonomou,²⁶ A. A. Paramonov,¹³ B. Parks,³⁹ S. Pashapour,⁶¹ J. Patrick,¹⁷ G. Pauletta,⁵⁴ M. Paulini,¹² C. Paus,³³ D. E. Pellett,⁷ A. Penzo,⁵⁴ T. J. Phillips,¹⁶ G. Piacentino,⁴⁶ J. Piedra,⁴⁴ L. Pinera,¹⁸ J. Pinfold,³⁴ K. Pitts,²⁴ C. Plager,⁸ L. Pondrom,⁵⁹ X. Portell,³ O. Poukhov,¹⁵ N. Pounder,⁴² F. Prakoshyn,¹⁵ A. Pronko,¹⁷ J. Proudfoot,² F. Ptohos,¹⁹ G. Punzi,⁴⁶ J. Pursley,²⁵ J. Rademacker,⁴² A. Rahaman,⁴⁷ V. Ramakrishnan,⁵⁹ N. Ranjan,⁴⁸ I. Redondo,³² B. Reisert,¹⁷ V. Rekovic,³⁷ P. Renton,⁴² M. Rescigno,⁵¹ S. Richter,²⁶ F. Rimondi,⁵ L. Ristori,⁴⁶ A. Robson,²¹ T. Rodrigo,¹¹ E. Rogers,²⁴ S. Rolli,⁵⁶ R. Roser,¹⁷ M. Rossi,⁵⁴ R. Rossin,¹⁰ P. Roy,⁶¹ A. Ruiz,¹¹ J. Russ,¹² V. Rusu,¹³ H. Saarikko,²³ A. Safonov,⁵³ W. K. Sakumoto,⁴⁹ G. Salamanna,⁵¹ O. Saltó,³ L. Santi,⁵⁴ S. Sarkar,⁵¹ L. Sartori,⁴⁶ K. Sato,¹⁷ P. Savard,⁶¹ A. Savoy-Navarro,⁴⁴ T. Scheidle,²⁶ P. Schlabach,¹⁷ E. E. Schmidt,¹⁷ M. P. Schmidt,⁶⁰ M. Schmitt,³⁸ T. Schwarz,⁷ L. Scodellaro,¹¹ A. L. Scott,¹⁰ A. Scribano,⁴⁶ F. Scuri,⁴⁶ A. Sedov,⁴⁸ S. Seidel,³⁷ Y. Seiya,⁴¹ A. Semenov,¹⁵ L. Sexton-Kennedy,¹⁷ A. Sfyrla,²⁰ S. Z. Shalhout,⁵⁸ M. D. Shapiro,²⁹ T. Shears,³⁰ P. F. Shepard,⁴⁷ D. Sherman,²² M. Shimojima,⁵⁵ M. Shochet,¹³ Y. Shon,⁵⁹ I. Shreyber,²⁰ A. Sidoti,⁴⁶ P. Sinervo,⁶¹ A. Sisakyan,¹⁵ A. J. Slaughter,¹⁷ J. Slaunwhite,³⁹ K. Sliwa,⁵⁶ J. R. Smith,⁷ F. D. Snider,¹⁷ R. Snihur,⁶¹ M. Soderberg,³⁵ A. Soha,⁷ S. Somalwar,⁵² V. Sorin,³⁶ J. Spalding,¹⁷ F. Spinella,⁴⁶ T. Spreitzer,⁶¹ P. Squillacioti,⁴⁶ M. Stanitzki,⁶⁰ A. Staveris-Polykalas,⁴⁶ R. St. Denis,²¹ B. Stelzer,⁸ O. Stelzer-Chilton,⁴² D. Stentz,³⁸ J. Strologas,³⁷ D. Stuart,¹⁰ J. S. Suh,²⁸ A. Sukhanov,¹⁸ H. Sun,⁵⁶ I. Suslov,¹⁵ T. Suzuki,⁵⁵ A. Taffard,²⁴ R. Takashima,⁴⁰ Y. Takeuchi,⁵⁵ R. Tanaka,⁴⁰ M. Tecchio,³⁵ P. K. Teng,¹ K. Terashi,⁵⁰ J. Thom,¹⁷ A. S. Thompson,²¹ E. Thomson,⁴⁵ P. Tipton,⁶⁰ V. Tiwari,¹² S. Tkaczyk,¹⁷ D. Toback,⁵³ S. Tokar,¹⁴ K. Tollefson,³⁶ T. Tomura,⁵⁵ D. Tonelli,⁴⁶ S. Torre,¹⁹ D. Torretta,¹⁷ S. Tourneur,⁴⁴ W. Trischuk,⁶¹ S. Tsuno,⁴⁰ Y. Tu,⁴⁵ N. Turini,⁴⁶ F. Ukegawa,⁵⁵ S. Uozumi,⁵⁵ S. Vallecorsa,²⁰ N. van Remortel,²³ A. Varganov,³⁵ E. Vataga,³⁷ F. Vazquez,¹⁸ G. Velev,¹⁷ C. Vellidis,⁴⁶ G. Veramendi,²⁴ V. Veszpremi,⁴⁸ M. Vidal,³² R. Vidal,¹⁷ I. Vila,¹¹ R. Vilar,¹¹ T. Vine,³¹ M. Vogel,³⁷ I. Vollrath,⁶¹ I. Volobouev,²⁹ G. Volpi,⁴⁶ F. Würthwein,⁹ P. Wagner,⁵³ R. G. Wagner,² R. L. Wagner,¹⁷ J. Wagner,²⁶ W. Wagner,²⁶ R. Wallny,⁸ S. M. Wang,¹ A. Warburton,⁶¹ D. Waters,³¹ M. Weinberger,⁵³ W. C. Wester III,¹⁷ B. Whitehouse,⁵⁶ D. Whiteson,⁴⁵ A. B. Wicklund,² E. Wicklund,¹⁷ G. Williams,⁶¹ H. H. Williams,⁴⁵ P. Wilson,¹⁷ B. L. Winer,³⁹ P. Wittich,¹⁷ S. Wolbers,¹⁷ C. Wolfe,¹³ T. Wright,³⁵ X. Wu,²⁰ S. M. Wynne,³⁰ A. Yagil,⁹ K. Yamamoto,⁴¹ J. Yamaoka,⁵² T. Yamashita,⁴⁰ C. Yang,⁶⁰ U. K. Yang,¹³ Y. C. Yang,²⁸ W. M. Yao,²⁹ G. P. Yeh,¹⁷ J. Yoh,¹⁷ K. Yorita,¹³ T. Yoshida,⁴¹ G. B. Yu,⁴⁹ I. Yu,²⁸ S. S. Yu,¹⁷ J. C. Yun,¹⁷ L. Zanello,⁵¹ A. Zanetti,⁵⁴ I. Zaw,²² X. Zhang,²⁴ J. Zhou,⁵² and S. Zucchelli⁵

(CDF Collaboration)

¹Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
²Argonne National Laboratory, Argonne, Illinois 60439, USA
³Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain
⁴Baylor University, Waco, Texas 76798, USA
⁵Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
⁶Brandeis University, Waltham, Massachusetts 02254, USA
⁷University of California, Davis, Davis, California 95616, USA
⁸University of California, Los Angeles, Los Angeles, California 90024, USA
⁹University of California, San Diego, La Jolla, California 92093, USA
¹⁰University of California, Santa Barbara, Santa Barbara, California 93106, USA
¹¹Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
¹²Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
¹³Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
¹⁴Comenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, Slovakia
¹⁵Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
¹⁶Duke University, Durham, North Carolina 27708
¹⁷Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
¹⁸University of Florida, Gainesville, Florida 32611, USA
¹⁹Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
²⁰University of Geneva, CH-1211 Geneva 4, Switzerland
²¹Glasgow University, Glasgow G12 8QQ, United Kingdom
²²Harvard University, Cambridge, Massachusetts 02138, USA
²³Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
²⁴University of Illinois, Urbana, Illinois 61801, USA
²⁵The Johns Hopkins University, Baltimore, Maryland 21218, USA
²⁶Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
²⁷High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan
²⁸Center for High Energy Physics: Kyungpook National University, Taegu 702-701, Korea; Seoul National University, Seoul 151-742, Korea; SungKyunKwan University, Suwon 440-746, Korea
²⁹Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
³⁰University of Liverpool, Liverpool L69 7ZE, United Kingdom
³¹University College London, London WC1E 6BT, United Kingdom
³²Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, E-28040 Madrid, Spain
³³Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
³⁴Institute of Particle Physics: University of Alberta, Edmonton, Canada T6G 2G7; McGill University, Montréal, Canada H3A 2T8; and University of Toronto, Toronto, Canada M5S 1A7
³⁵University of Michigan, Ann Arbor, Michigan 48109, USA
³⁶Michigan State University, East Lansing, Michigan 48824, USA
³⁷University of New Mexico, Albuquerque, New Mexico 87131, USA
³⁸Northwestern University, Evanston, Illinois 60208, USA
³⁹The Ohio State University, Columbus, Ohio 43210, USA
⁴⁰Okayama University, Okayama 700-8530, Japan
⁴¹Osaka City University, Osaka 588, Japan
⁴²University of Oxford, Oxford OX1 3RH, United Kingdom
⁴³University of Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
⁴⁴LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France
⁴⁵University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
⁴⁶Istituto Nazionale di Fisica Nucleare Pisa, Universities of Pisa, Siena and Scuola Normale Superiore, I-56127 Pisa, Italy
⁴⁷University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
⁴⁸Purdue University, West Lafayette, Indiana 47907, USA
⁴⁹University of Rochester, Rochester, New York 14627, USA
⁵⁰The Rockefeller University, New York, New York 10021, USA
⁵¹Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, University of Rome “La Sapienza,” I-00185 Roma, Italy
⁵²Rutgers University, Piscataway, New Jersey 08855, USA
⁵³Texas A&M University, College Station, Texas 77843, USA
⁵⁴Istituto Nazionale di Fisica Nucleare, University of Trieste/ Udine, Italy
⁵⁵University of Tsukuba, Tsukuba, Ibaraki 305, Japan
⁵⁶Tufts University, Medford, Massachusetts 02155, USA
⁵⁷Waseda University, Tokyo 169, Japan
⁵⁸Wayne State University, Detroit, Michigan 48201, USA
⁵⁹University of Wisconsin, Madison, Wisconsin 53706, USA
⁶⁰Yale University, New Haven, Connecticut 06520, USA
⁶¹Institute of Particle Physics: McGill University, Montréal, Canada H3A 2T8; and University of Toronto, Toronto, Canada M5S 1A7

We have searched for exclusive production in proton-antiproton collisions at =1.96 TeV, using 532 pb^-1 of integrated luminosity taken by the run II Collider Detector at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy E_T>5 GeV and pseudorapidity ||<1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with , ⁰⁰, or production. The probability that other processes fluctuate to 3 events is 1.7×10^-4. An upper limit on the cross section of pp++ production is set at 410 fb with 95% confidence level.

©2007 The American Physical Society

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