APS » Phys. Rev. Lett. » Volume 103 » Issue 3

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

(CDF Collaboration)

¹Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
²Argonne National Laboratory, Argonne, Illinois 60439, USA
³University of Athens, 157 71 Athens, Greece
⁴Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain
⁵Baylor University, Waco, Texas 76798, USA
^6aIstituto Nazionale di Fisica Nucleare Bologna, I-40127 Bologna, Italy
^6bUniversity of Bologna, I-40127 Bologna, Italy
⁷Brandeis University, Waltham, Massachusetts 02254, USA
⁸University of California, Davis, Davis, California 95616, USA
⁹University of California, Los Angeles, Los Angeles, California 90024, USA
¹⁰University of California, San Diego, La Jolla, California 92093, USA
¹¹University of California, Santa Barbara, Santa Barbara, California 93106, USA
¹²Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
¹³Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
¹⁴Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
¹⁵Comenius University, 842 48 Bratislava, Slovakia; Institute of Experimental Physics, 040 01 Kosice, Slovakia
¹⁶Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
¹⁷Duke University, Durham, North Carolina 27708, USA
¹⁸Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
¹⁹University of Florida, Gainesville, Florida 32611, USA
²⁰Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
²¹University of Geneva, CH-1211 Geneva 4, Switzerland
²²Glasgow University, Glasgow G12 8QQ, United Kingdom
²³Harvard University, Cambridge, Massachusetts 02138, USA
²⁴Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
²⁵University of Illinois, Urbana, Illinois 61801, USA
²⁶The Johns Hopkins University, Baltimore, Maryland 21218, USA
²⁷Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
²⁸Center for High Energy Physics: Kyungpook National University, Daegu 702-701, Korea; Seoul National University, Seoul 151-742, Korea; Sungkyunkwan University, Suwon 440-746, Korea; Korea Institute of Science and Technology Information, Daejeon, 305-806, Korea; Chonnam National University, Gwangju, 500-757, 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
³⁴Institute of Particle Physics: McGill University, Montréal, Québec, Canada H3A 2T8; Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6; University of Toronto, Toronto, Ontario, Canada M5S 1A7; and TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
³⁵University of Michigan, Ann Arbor, Michigan 48109, USA
³⁶Michigan State University, East Lansing, Michigan 48824, USA
³⁷Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
³⁸University of New Mexico, Albuquerque, New Mexico 87131, USA
³⁹Northwestern University, Evanston, Illinois 60208, USA
⁴⁰The Ohio State University, Columbus, Ohio 43210, USA
⁴¹Okayama University, Okayama 700-8530, Japan
⁴²Osaka City University, Osaka 588, Japan
⁴³University of Oxford, Oxford OX1 3RH, United Kingdom
^44aIstituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
^44bUniversity of Padova, I-35131 Padova, Italy
⁴⁵LPNHE, Universite Pierre et Marie Curie/IN2P3-CNRS, UMR7585, Paris, F-75252 France
⁴⁶University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
^47aIstituto Nazionale di Fisica Nucleare Pisa, I-56127 Pisa, Italy
^47bUniversity of Pisa, I-56127 Pisa, Italy
^47cUniversity of Siena, I-56127 Pisa, Italy
^47dScuola Normale Superiore, I-56127 Pisa, Italy
⁴⁸University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
⁴⁹Purdue University, West Lafayette, Indiana 47907, USA
⁵⁰University of Rochester, Rochester, New York 14627, USA
⁵¹The Rockefeller University, New York, New York 10021, USA
^52aIstituto Nazionale di Fisica Nucleare, Sezione di Roma 1, I-00185 Roma, Italy
^52bSapienza Università di Roma, I-00185 Roma, Italy
⁵³Rutgers University, Piscataway, New Jersey 08855, USA
⁵⁴Texas A&M University, College Station, Texas 77843, USA
^55aIstituto Nazionale di Fisica Nucleare Trieste/Udine, I-34100 Trieste, Italy
^55bUniversity of Trieste/Udine, I-33100 Udine, Italy
⁵⁶University of Tsukuba, Tsukuba, Ibaraki 305, Japan
⁵⁷Tufts University, Medford, Massachusetts 02155, USA
⁵⁸Waseda University, Tokyo 169, Japan
⁵⁹Wayne State University, Detroit, Michigan 48201, USA
⁶⁰University of Wisconsin, Madison, Wisconsin 53706, USA
⁶¹Yale University, New Haven, Connecticut 06520, USA

We search for new charmless decays of neutral b hadrons to pairs of charged hadrons, using 1 fb^-1 of data collected by the CDF  II detector at the Fermilab Tevatron. We report the first observation of the BK^-+ decay and measure (BK^-+)=(5.0±0.7(stat)±0.8(syst))×10^-6. We also report the first observation of charmless b-baryon decays, and measure (p^-)=(3.5±0.6(stat)±0.9(syst))×10^-6 and (pK^-)=(5.6±0.8(stat)±1.5(syst))×10^-6. No evidence is found for other modes, and we set the limit (B^+-)<1.2×10^-6 at 90% C.L.

©2009 The American Physical Society

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