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  • A Fermi National Accelerator Laboratory

    FERMILAB Pub-95/022-E CDF

    Observation of Top Quark Production in pp Collisions

    F. Abe et al. The CDF Collaboration

    Fermi National Accelerator Laboratory P.O. Box 500, Batauia, Illinois 60510

    February1995

    Submitted to Physical Revkw~ Letters

    0 Operated by UniversiEer Rereati Aswciatian Inc. under Contract No. DE-AC02-76CH03000 with Ihe United States Department of Energy

  • Disclaimer

    Thin report MII prepared 08 an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof. nor any of their unployees, make8 any warranty, express or implied, or assume8 any legal liability or responsibility for the accuracy, completeness, or uaefheaa of any information, appomtuq product, or process disclosed, or represents that ita use would not infringe privately owned rights. Reference herein to any apecifi commercial product, process, or service by trade name, trademark, manufacturer, or otherwise. does not necessarily constitute or imply ita endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein ~‘e;~~fteaaawily state or reftect those of the United States Government or any agency

  • FERMILAB-PUB-95/022-E CDF/PUB/TOP/PUBLIC/3040

    Observation of Top Quark Production in fip Collisions

    Abstract

    We establish the existence of the top quark using a 67 pb-’ data sample

    of @ collisions at J;; = 1.8 TeV collected with the Collider Detector at Fer-

    milab (CDF). Employing techniques similar to those we previously published,

    we observe a signal consistent with tf decay to WWb6, but inconsistent with

    the background prediction by 4.80. Additional evidence for the top quark is

    provided by a peak in the reconstructed mass distribution. We measure the

    top quark mass to be 176 6 8(stat.) f lO(sys.) GeV/c’, and the tf production

    cross section to be 6.8+;:: pb.

    The CDF Collaboration

    F. Abe,14 H. Akimoto,32 A. Akopian, *? M. G. Albrow, S. R. Amendolia,24

    D. Amidei,” J. Antos,29 C. Anway-Wiese,4 S. Aota,32 G. Apollinari,27

    T. Asakawa,= W. Ashmanskas, l5 M. Atac,? P. Auchincloss,2s F. A&r,=

    P. Azzi-Bacchetta,21 N. Bacchetta,21 W. Badgett,” S. Bagdasarov,27

    M. W. Bailey,‘g J. Bao,3’ P. de Barbarots A. Barbara-Galtieri,‘s V. E. Barnes,*’

    B. A. Barnett,‘3 P. Bartalini,24 G. Bauer,‘s T. Baumann,g F. Bedeschi,24

    S. Behrends,3 S. Belfortet4 G. Bellettini,24 J. Bellinger,34 D. Benjamin,31

    J. Benlloch, ‘s J. Bensinger, D. Benton,‘* A. Beretvas,’ J. P. Berge,’ S. Bertolucci,’

    A. Bhatti,” K. Biery, I2 M. Binkley,7 D. Bisello, *I R. E. Blair,’ C. Blocker,3

    A. Bodek ‘s W 1 . Bokhari ,I6 V. Bolognesi,24 D. Bortoletto,*s J. Boudreau,23

    G. Brandenburg,g L. Breccia,’ C. Bromberg,‘s E. Buckley-GeeI, H. S. Buddts

    K. Burkett,17 G. Bus&to, 21 A. Byon-Wagner,’ K. L. Byrum,’ J. Cammerata,‘3

    Submitted to Physical Review Letters February 24, 1995 1

  • C. Campagnari: M. Campbell,” A. Caner,’ W. Carithers,” D. Carlsmith,

    A. Castq2’ G. Cauqz4 Y. Cq2” F. Cer~elli,~~ H. Y. Chao, ” J. Chapman, 1’

    M.-T. Cheng,2’ G. Chia~elli,~~ T. Chikamatsq3* C. N. Chiqz9 L. Christofek,”

    S. Cihangir,’ A. G. Clark,24 M. Cobal, M. Contreras,’ J. Conway,‘* J. Cooper,’

    M. CordeUi,s C. Couyoumtaelis, 24 D. Crane,’ D. Cronin-Hennessy,’ R. Culbertson,’

    J. D. Cunninghaq3 T. Daniels,‘s F. DeJongh,7 S. Delchamps,’ S. Dell’Agnello,24

    M. Dell’Ors~,*~ L. Demortier, ” B. Denby, 24 M. Deninno,2 P. F. Derwent,”

    T. De~lin,~~ M. Dickson, ‘s J. R. Dittmann,s S. Donati,24 R. B. Drucker,”

    A. D~nn,‘~ N. Eddy,” K. Einsweiler,‘s J. E. Elias,’ R. Ely,15 E. Engels, JI.,‘~

    D. Errede,” S. Errede,” Q. Fan;” I. Fiori: B. Flaugher,’ G. W. Foster,’

    M. Franklin: M. Frautschi,” J. F~eeman,~ J. Friedmaq’s II. Frisch,’ T. A. Fuess,’

    Y. Fukui,14 S. Funaki,32 G. Gagliardi,24 S. Galeotti,24 M. Gallinaro,*l

    M. Garcia-Sciveres,” A. F. Garfinkel,25 C. Gay,9 S. Gee~,~ D. W. Gerdes,”

    P. Giannetti,24 N. Giokaris,” P. Giromini,s L. Gladney, *’ D. Glenzinski,‘3

    M Gold I9 J. Gonzalez,22 A. Gordoqg A. T. Goshaw,s K. Goulianos,*’ . 7

    H. Grassmann,’ L. Groer,*s C. Grosso-Pilcher,5 G. Guillian,” R. S. Guo,*~

    C. Haber,l’ S. R. Hahn,’ R. Hamilton,’ R. Handler,34 R. M. Hans,35 K. Hara,32

    B. Harral,** R. M. Harris,’ S. A. Hauger,’ J. Hauser, C. Hawk,z8 E. Hayashi,32

    3. Heinrich,22 M. Hohlmann,‘~s C. Holck,Z2 R. Hollebeek, 22 L. Holloway,‘l

    A. HGlscher,‘* S. Hong,” G. Houk,22 P. Hu,‘~ B. T. H~ffman,~~ R. Hughes,”

    J. Huston,l’ J. Huth,g J. Hylen,’ H. Ikeda,32 M. Incagli,24 J. Incandela,’ J. 1~4,~~

    Y. Iwata,” H. Jensen,’ U. J~shi,~ R. W. Kadel,” E. Kajfasz,” T. Kamon,30

    T. Kaneko,32 K. Karr,33 H. Kasha,3s Y. Kato,2’ L. Keeblq8 K. Kelley,‘”

    R. D. Kennedy,*8 R. Kephart,’ P. Kesten,” D. Kestenbaum,’ R. M. Keup,”

    H. Keutelian,’ F. Keyvan: B. J. Kim,‘” D. H. Kiq7” H. S. Kim,12 S. B. Kim,17

    S. H. Kim,32 Y. K. Kim,15 L. Kirsch,3 P. Koehq’s K. Kondq3’ J. Konigsberg,’

    S. Kopp,s K. Kordas, I2 W. Koska,’ E. Kovac~,‘~ W. Kowald,s M. Krasberg,”

    2

  • J. Kr~ll,~ M. Kruse,2j T. Kuwabara,= S. E. Kuhlmann,’ E. Kun~,~s

    A. T. Laasaneqz5 N. Labanca, 24 S. Lammel, J. I. Lamoureu~,~ T. LeCompte,”

    S. Leone,‘* J. D. Lewi~,~ P. Limon,’ M. Lindgren,4 T. M. Liss,” N. Lockyer,”

    0. Long,22 C. Loomis,*s M. Loreti,‘l J. Lu,3’ D. Lucchesi,24 P. Lukens,7 S. Lusin,34

    J. Lys,15 K. Maeshima,’ A. Maghakiaqz7 P. Maksimovic,” M. Mangarqz4

    J. Mansour,” M. Mariotti,‘l .I. P. Marriner,’ A. Martin,” J. A. J. Matthews,lg

    R. Mattingly, ‘s P. McIntyre, 3o P. Melese, 27 A. Menzione, 24 E. Meschi, 24 S. Metzler,22

    C. Miao,17 G. Michail,g S. Mikamo,“’ R. Miller,” H. Minato,32 S. Miscetti,s

    M. Mishina,14 H. Mitsushio, s* T. Miyamoto, ” S. Miyashita,32 Y. Morita,14

    J. Mueller,23 A. Mukherjee,7 T. Muller,4 P. Murat, H. Nakada,32 I. Nakano,32

    C. Nelsoq7 D. Neuberger,4 C. Newman-Holmes,’ M. Ninomiya,32 L. Nodulman,’

    S. Ogawa,s2 S. H. Oh,s K. E. Ohl,35 T. Ohmoto,“’ T. Ohsugi,10 R. Oishi,32

    M. Okabe,3z T. Okusawa, *’ R. Oliver,2* J. Olsen,34 C. Pagliarone,’ R. Paoletti,24

    V. Papadimitrioq3’ S. P. Pappas,35 S. Park,’ J. Patrick,’ G. Pauletta,24

    M. Paulini,‘s L. Pescara, ** M. D. Peters,” T. J. Phillips,’ G. Piacentino,’

    M. Pillai,26 K. T. Pitts,7 R. Plunkett,7 L. Pondrom,34 J. Proudfoot,’ F. Ptohos,’

    G. Punzi,24 K. Ragan,12 A. Ribon, ” F. Rimondi,’ L. Ristori,24 W. J. Robertsoqs

    T. Rodrigo,7a J. Romaxq5 L. Rosenson,” R. Roser,” W. K. Sakumoto,‘s

    D. Saltzberg: A. Sansoni,s L. Santi,‘* H. Sato,32 V. Scarpine,3’ P. Schlabach,’

    E. E. Schmidt,’ M. P. Schmidt,3s G. F. Sciaccaz4 A. Scribaxqz4 S. Segler,7

    S. Seidel,” Y. Seiya:’ G. Sganos,” A. Sgolacchia,2 M. D. Shapiro,15 N. M. Shaw,2’

    Q. Shents P. F. Shepard,23 M. Shimojima,3’ M. Shochet,’ J. Siegrist,” A. SilI,3’

    P. Sinervo,12 P. Singh,‘s J. Skarha,13 K. Sliwa,s3 D. A. Smith,24 F. D. Snider,‘s

    T. Song, I7 J. Spalding,7 P. Sphicas,‘s L. Spiegel,’ A. Spies,‘s L. Stance,”

    J. Steele,34 A. Stefanini, 24 K. Strahl,‘* J. Strait,7 D. Stuart,’ G. Sullivan,’

    A. Soumarokov,29 K. Sumorok,16 J. Suzuki,32 T. Takada,32 T. Takahashi,”

    T. Takano,32 K. Takikawa,32 N. Tamura,” F. Tartarelli,24 W. Taylor,”

    3

  • P. K. Teng,*’ Y. Teramoto,” S. Tether,” D. Theriot,’ T. L. Thomas,” R. Thun,”

    M. Timko,33 P. Tiptoqz6 A. Titov, *’ S. Tkaczyk,’ D. Toback,’ K. Tollefsoqz6

    A. Tollestrup,’ J. Tonnison,” J. F. de Troconia, ’ S. Truitt,17 J. Tseng,13

    N. Turini,*4 T. Uchida,32 N. Uemura,32 F. Ukegawa,” G. Unal,**

    S. C. van den Brink,23 S. Vejcik, III,” G. Velev,24 R. Vidal,’ M. Vondracek,”

    D. Vucinic,‘” R. G. Wagner,’ R. L. Wagner, ’ J. Wahl,5 R. C. Walker,26 C. Wang,6

    C. H. Wang,29 G. Wangt4 J. Wang,’ M. J. Wang,29 Q. F. Wang,*’ A. Warburton,”

    G. Watts,26 T. Watts,” R. Webb,30 C. Wei, C. Wendt,34 H. Wenzel,”

    W. C. Wester, III,’ A. B. Wicklund,’ E. Wicklund,’ R. Wilkinson,*’

    H. H. Williams,” P. Wilson,’ B. L. Winer,26 D. Wolinski, I’ J. Wolinski,30 X. Wqz4

    J. Wyq2’ A. Yagil,’ W. Yao,15 K. Yasuoka,32 Y. Ye,” G. P. Yeh,’ P. Yeh,”

    M. Yin,’ J. Yoh,7 C. Yosef,” T. Yoshida,” D. Yovanovitch,’ I. Yq3’ J. C. Yun,’

    A. Zanetti,24 F. Zetti,24 L. Zhang,34 W. Zhang,” and S. Zucchelli’

    (CDF Collaboration)

    ' Argonne Ndianol Lubomtory, Argonne, Illinois bUS9

    2 Iditulo Norionnle di Fiaica Nudeore, hivcrsily of Bologna, I-/OIL6 Bologna, It&

    3 Bmndcia Unircmity, Walthom, Moasachwcttr 08M4

    4 Uniwetsity of Califoornin 01 Lo, Anpelea, Lor Angrlc~ Califcwnio 90011

    5 Uniuerdy of Chimp, Chicago, Illinois 60657

    6 D& Uniwcrrity, Dsrhmn, North Cmdim 6’7708

    7 Fermi Notional Accrlemlor La6omtory, Bolovia, Illinois 6

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