Phys. Rev. D
80,
011102(R)
(2009)
[10 pages]
Searching the inclusive ℓγE̸T+b-quark signature for radiative top quark decay and non-standard-model processes
T. Aaltonen et al. CDF Collaboration
Show All Authors/Affiliations
Hide All Authors/Affiliations
T. Aaltonen24, J. Adelman14, T. Akimoto56, B. Álvarez González12,n, S. Amerio44b,44a, D. Amidei35, A. Anastassov39, A. Annovi20, J. Antos15, G. Apollinari18, A. Apresyan49, T. Arisawa58, A. Artikov16, W. Ashmanskas18, A. Attal4, A. Aurisano54, F. Azfar43, W. Badgett18, A. Barbaro-Galtieri29, V. E. Barnes49, B. A. Barnett26, P. Barria47c,47a, V. Bartsch31, G. Bauer33, P.-H. Beauchemin34, F. Bedeschi47a, D. Beecher31, S. Behari26, G. Bellettini47b,47a, J. Bellinger60, D. Benjamin17, A. Beretvas18, J. Beringer29, A. Bhatti51, M. Binkley18, D. Bisello44b,44a, I. Bizjak31,s, R. E. Blair2, C. Blocker7, B. Blumenfeld26, A. Bocci17, A. Bodek50, V. Boisvert50, G. Bolla49, D. Bortoletto49, J. Boudreau48, A. Boveia11, B. Brau11,†, A. Bridgeman25, L. Brigliadori6b,6a, C. Bromberg36, E. Brubaker14, J. Budagov16, H. S. Budd50, S. Budd25, S. Burke18, K. Burkett18, G. Busetto44b,44a, P. Bussey22, A. Buzatu34, K. L. Byrum2, S. Cabrera17,p, C. Calancha32, M. Campanelli36, M. Campbell35, F. Canelli14,18, A. Canepa46, B. Carls25, D. Carlsmith60, R. Carosi47a, S. Carrillo19,h, S. Carron34, B. Casal12, M. Casarsa18, A. Castro6b,6a, P. Catastini47c,47a, D. Cauz55b,55a, V. Cavaliere47c,47a, M. Cavalli-Sforza4, A. Cerri29, L. Cerrito31,j, S. H. Chang28, Y. C. Chen1, M. Chertok8, G. Chiarelli47a, G. Chlachidze18, F. Chlebana18, K. Cho28, D. Chokheli16, J. P. Chou23, G. Choudalakis33, S. H. Chuang53, K. Chung13, W. H. Chung60, Y. S. Chung50, T. Chwalek27, C. I. Ciobanu45, M. A. Ciocci47c,47a, A. Clark21, D. Clark7, G. Compostella44a, M. E. Convery18, J. Conway8, M. Cordelli20, G. Cortiana44b,44a, C. A. Cox8, D. J. Cox8, F. Crescioli47b,47a, C. Cuenca Almenar8,p, J. Cuevas12,n, R. Culbertson18, J. C. Cully35, D. Dagenhart18, M. Datta18, T. Davies22, P. de Barbaro50, S. De Cecco52a, A. Deisher29, G. De Lorenzo4, M. Dell’Orso47b,47a, C. Deluca4, L. Demortier51, J. Deng17, M. Deninno6a, P. F. Derwent18, A. Di Canto47b,47a, G. P. di Giovanni45, C. Dionisi52b,52a, B. Di Ruzza55b,55a, J. R. Dittmann5, M. D’Onofrio4, S. Donati47b,47a, P. Dong9, J. Donini44a, T. Dorigo44a, S. Dube53, J. Efron40, A. Elagin54, R. Erbacher8, D. Errede25, S. Errede25, R. Eusebi18, H. C. Fang29, S. Farrington43, W. T. Fedorko14, R. G. Feild61, M. Feindt27, J. P. Fernandez32, C. Ferrazza47d,47a, R. Field19, G. Flanagan49, R. Forrest8, M. J. Frank5, M. Franklin23, J. C. Freeman18, H. J. Frisch14, I. Furic19, M. Gallinaro52a, J. Galyardt13, F. Garberson11, J. E. Garcia21, A. F. Garfinkel49, P. Garosi47c,47a, K. Genser18, H. Gerberich25, D. Gerdes35, A. Gessler27, S. Giagu52b,52a, V. Giakoumopoulou3, P. Giannetti47a, K. Gibson48, J. L. Gimmell50, C. M. Ginsburg18, N. Giokaris3, M. Giordani55b,55a, P. Giromini20, M. Giunta47a, G. Giurgiu26, V. Glagolev16, D. Glenzinski18, M. Gold38, N. Goldschmidt19, A. Golossanov18, G. Gomez12, G. Gomez-Ceballos33, M. Goncharov33, O. González32, I. Gorelov38, A. T. Goshaw17, K. Goulianos51, A. Gresele44b,44a, S. Grinstein23, C. Grosso-Pilcher14, R. C. Group18, U. Grundler25, J. Guimaraes da Costa23, Z. Gunay-Unalan36, C. Haber29, K. Hahn33, S. R. Hahn18, E. Halkiadakis53, B.-Y. Han50, J. Y. Han50, F. Happacher20, K. Hara56, D. Hare53, M. Hare57, S. Harper43, R. F. Harr59, R. M. Harris18, M. Hartz48, K. Hatakeyama51, C. Hays43, M. Heck27, A. Heijboer46, J. Heinrich46, C. Henderson33, M. Herndon60, J. Heuser27, S. Hewamanage5, D. Hidas17, C. S. Hill11,§, D. Hirschbuehl27, A. Hocker18, S. Hou1, M. Houlden30, S.-C. Hsu29, B. T. Huffman43, R. E. Hughes40, U. Husemann61, M. Hussein36, J. Huston36, J. Incandela11, G. Introzzi47a, M. Iori52b,52a, A. Ivanov8, E. James18, D. Jang13, B. Jayatilaka17, E. J. Jeon28, M. K. Jha6a, S. Jindariani18, W. Johnson8, M. Jones49, K. K. Joo28, S. Y. Jun13, J. E. Jung28, T. R. Junk18, T. Kamon54, D. Kar19, P. E. Karchin59, Y. Kato42,f, R. Kephart18, W. Ketchum14, J. Keung46, V. Khotilovich54, B. Kilminster18, D. H. Kim28, H. S. Kim28, H. W. Kim28, J. E. Kim28, M. J. Kim20, S. B. Kim28, S. H. Kim56, Y. K. Kim14, N. Kimura56, L. Kirsch7, S. Klimenko19, B. Knuteson33, B. R. Ko17, K. Kondo58, D. J. Kong28, J. Konigsberg19, A. Korytov19, A. V. Kotwal17, M. Kreps27, J. Kroll46, D. Krop14, N. Krumnack5, M. Kruse17, V. Krutelyov11, T. Kubo56, T. Kuhr27, N. P. Kulkarni59, M. Kurata56, S. Kwang14, A. T. Laasanen49, S. Lami47a, S. Lammel18, M. Lancaster31, R. L. Lander8, K. Lannon40,m, A. Lath53, G. Latino47c,47a, I. Lazzizzera44b,44a, T. LeCompte2, E. Lee54, H. S. Lee14, S. W. Lee54,o, S. Leone47a, J. D. Lewis18, C.-S. Lin29, J. Linacre43, M. Lindgren18, E. Lipeles46, A. Lister8, D. O. Litvintsev18, C. Liu48, T. Liu18, N. S. Lockyer46, A. Loginov61, M. Loreti44b,44a, L. Lovas15, D. Lucchesi44b,44a, C. Luci52b,52a, J. Lueck27, P. Lujan29, P. Lukens18, G. Lungu51, L. Lyons43, J. Lys29, R. Lysak15, D. MacQueen34, R. Madrak18, K. Maeshima18, K. Makhoul33, T. Maki24, P. Maksimovic26, S. Malde43, S. Malik31, G. Manca30,††, A. Manousakis-Katsikakis3, F. Margaroli49, C. Marino27, C. P. Marino25, A. Martin61, V. Martin22,e, M. Martínez4, R. Martínez-Ballarín32, T. Maruyama56, P. Mastrandrea52a, T. Masubuchi56, M. Mathis26, M. E. Mattson59, P. Mazzanti6a, K. S. McFarland50, P. McIntyre54, R. McNulty30,d, A. Mehta30, P. Mehtala24, A. Menzione47a, P. Merkel49, C. Mesropian51, T. Miao18, N. Miladinovic7, R. Miller36, C. Mills23, M. Milnik27, A. Mitra1, G. Mitselmakher19, H. Miyake56, N. Moggi6a, C. S. Moon28, R. Moore18, M. J. Morello47a, J. Morlock27, P. Movilla Fernandez18, J. Mülmenstädt29, A. Mukherjee18, Th. Muller27, R. Mumford26, P. Murat18, M. Mussini6b,6a, J. Nachtman18,i, Y. Nagai56, A. Nagano56, J. Naganoma56, K. Nakamura56, I. Nakano41, A. Napier57, V. Necula17, J. Nett60, C. Neu46,q, M. S. Neubauer25, S. Neubauer27, J. Nielsen29,a, L. Nodulman2, M. Norman10, O. Norniella25, E. Nurse31, L. Oakes43, S. H. Oh17, Y. D. Oh28, I. Oksuzian19, T. Okusawa42, R. Orava24, K. Osterberg24, S. Pagan Griso44b,44a, E. Palencia18, V. Papadimitriou18, A. Papaikonomou27, A. A. Paramonov14, B. Parks40, S. Pashapour34, J. Patrick18, G. Pauletta55b,55a, M. Paulini13, C. Paus33, T. Peiffer27, D. E. Pellett8, A. Penzo55a, T. J. Phillips17, G. Piacentino47a, E. Pianori46, L. Pinera19, K. Pitts25, C. Plager9, L. Pondrom60, O. Poukhov16,*, N. Pounder43, F. Prakoshyn16, A. Pronko18, J. Proudfoot2, F. Ptohos18,c, E. Pueschel13, G. Punzi47b,47a, J. Pursley60, J. Rademacker43,§, A. Rahaman48, V. Ramakrishnan60, N. Ranjan49, I. Redondo32, P. Renton43, M. Renz27, M. Rescigno52a, S. Richter27, F. Rimondi6b,6a, L. Ristori47a, A. Robson22, T. Rodrigo12, T. Rodriguez46, E. Rogers25, S. Rolli57, R. Roser18, M. Rossi55a, R. Rossin11, P. Roy34, A. Ruiz12, J. Russ13, V. Rusu18, B. Rutherford18, H. Saarikko24, A. Safonov54, W. K. Sakumoto50, O. Saltó4, L. Santi55b,55a, S. Sarkar52b,52a, L. Sartori47a, K. Sato18, A. Savoy-Navarro45, P. Schlabach18, A. Schmidt27, E. E. Schmidt18, M. A. Schmidt14, M. P. Schmidt61,*, M. Schmitt39, T. Schwarz8, L. Scodellaro12, A. Scribano47c,47a, F. Scuri47a, A. Sedov49, S. Seidel38, Y. Seiya42, A. Semenov16, L. Sexton-Kennedy18, F. Sforza47b,47a, A. Sfyrla25, S. Z. Shalhout59, T. Shears30, P. F. Shepard48, M. Shimojima56,l, S. Shiraishi14, M. Shochet14, Y. Shon60, I. Shreyber37, P. Sinervo34, A. Sisakyan16, A. J. Slaughter18, J. Slaunwhite40, K. Sliwa57, J. R. Smith8, F. D. Snider18, R. Snihur34, A. Soha8, S. Somalwar53, V. Sorin36, T. Spreitzer34, P. Squillacioti47c,47a, M. Stanitzki61, R. St. Denis22, B. Stelzer34, O. Stelzer-Chilton34, D. Stentz39, J. Strologas38, G. L. Strycker35, J. S. Suh28, A. Sukhanov19, I. Suslov16, T. Suzuki56, A. Taffard25,‡‡, R. Takashima41, Y. Takeuchi56, R. Tanaka41, M. Tecchio35, P. K. Teng1, K. Terashi51, J. Thom18,b, A. S. Thompson22, G. A. Thompson25, E. Thomson46, P. Tipton61, P. Ttito-Guzmán32, S. Tkaczyk18, D. Toback54, S. Tokar15, K. Tollefson36, T. Tomura56, D. Tonelli18, S. Torre20, D. Torretta18, P. Totaro55b,55a, S. Tourneur45, M. Trovato47d,47a, S.-Y. Tsai1, Y. Tu46, N. Turini47c,47a, F. Ukegawa56, S. Vallecorsa21, N. van Remortel24,‡, A. Varganov35, E. Vataga47d,47a, F. Vázquez19,h, G. Velev18, C. Vellidis3, M. Vidal32, R. Vidal18, I. Vila12, R. Vilar12, T. Vine31, M. Vogel38, I. Volobouev29,o, G. Volpi47b,, P. Wagner46, R. G. Wagner2, R. L. Wagner18, W. Wagner27,r, J. Wagner-Kuhr27, T. Wakisaka42, R. Wallny9, S. M. Wang1, A. Warburton34, D. Waters31, M. Weinberger54, J. Weinelt27, W. C. Wester III18, B. Whitehouse57, D. Whiteson46,‡‡, A. B. Wicklund2, E. Wicklund18, S. Wilbur14, G. Williams34, H. H. Williams46, P. Wilson18, B. L. Winer40, P. Wittich18,b, S. Wolbers18, C. Wolfe14, T. Wright35, X. Wu21, F. Würthwein10, S. Xie33, A. Yagil10, K. Yamamoto42, J. Yamaoka17, U. K. Yang14,k, Y. C. Yang28, W. M. Yao29, G. P. Yeh18, K. Yi18,i, J. Yoh18, K. Yorita58, T. Yoshida42,g, G. B. Yu50, I. Yu28, S. S. Yu18, J. C. Yun18, L. Zanello52b,52a, A. Zanetti55a, X. Zhang25, Y. Zheng9,**, and S. Zucchelli6b,6a (CDF Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
2Argonne National Laboratory, Argonne, Illinois 60439
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
6aIstituto Nazionale di Fisica Nucleare Bologna, I-40127 Bologna, Italy;
6bUniversity of Bologna, I-40127 Bologna, Italy
7Brandeis University, Waltham, Massachusetts 02254
8University of California, Davis, Davis, California 95616
9University of California, Los Angeles, Los Angeles, California 90024
10University of California, San Diego, La Jolla, California 92093
11University of California, Santa Barbara, Santa Barbara, California 93106
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
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
18Fermi National Accelerator Laboratory, Batavia, Illinois 60510
19University of Florida, Gainesville, Florida 32611
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
24Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland, USA
25University of Illinois, Urbana, Illinois 61801
26The Johns Hopkins University, Baltimore, Maryland 21218
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
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
36Michigan State University, East Lansing, Michigan 48824
37Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
38University of New Mexico, Albuquerque, New Mexico 87131
39Northwestern University, Evanston, Illinois 60208
40The Ohio State University, Columbus, Ohio 43210
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
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
49Purdue University, West Lafayette, Indiana 47907
50University of Rochester, Rochester, New York 14627
51The Rockefeller University, New York, New York 10021
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
54Texas A & University, College Station, Texas 77843
55aIstituto Nazionale di Fisica Nucleare Trieste/Udine, I-34100 Trieste, I-33100 Udine, Italy;
55bUniversity of Trieste/Udine, I-33100 Udine, Italy
56University of Tsukuba, Tsukuba, Ibaraki 305, Japan
57Tufts University, Medford, Massachusetts 02155
58Waseda University, Tokyo 169, Japan
59Wayne State University, Detroit, Michigan 48201
60University of Wisconsin, Madison, Wisconsin 53706
61Yale University, New Haven, Connecticut 06520
Received 3 June 2009; published 30 July 2009
We compare the inclusive production of events containing a lepton (ℓ), a photon (γ), significant transverse momentum imbalance (E̸T), and a jet identified as containing a b-quark, to SM predictions. The search uses data produced in proton-antiproton collisions at √s=1.96 TeV corresponding to 1.9 fb-1 of integrated luminosity taken with the CDF detector. We find 28 ℓγbE̸T events versus an expectation of 31.0-3.5+4.1 events. If we further require events to contain at least three jets and large total transverse energy, the largest SM source is radiative top-quark pair production, tt̅ +γ. In the data we observe 16 tt̅ γ candidate events versus an expectation from SM sources of 11.2-2.1+2.3. Assuming the difference between the observed number and the predicted non-top-quark total of 6.8-2.0+2.2 is due to SM top-quark production, we estimate the tt̅ γ cross section to be 0.15±0.08 pb.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.80.011102
DOI:
10.1103/PhysRevD.80.011102
PACS:
13.85.Rm, 12.60.Jv, 13.85.Qk, 14.80.Ly
*Deceased †Visitors from University of MA Amherst, Amherst, MA 01003, USA ‡Visitors from Universiteit Antwerpen, B-2610 Antwerp, Belgium §Visitors from University of Bristol, Bristol BS8 1TL, United Kingdom **Visitors from Chinese Academy of Sciences, Beijing 100864, China ††Visitors from Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari, 09042 Monserrato (Cagliari), Italy ‡‡Visitors from University of CA Irvine, Irvine, CA 92697, USA aVisitors from University of CA Santa Cruz, Santa Cruz, CA 95064, USA bVisitors from Cornell University, Ithaca, NY 14853, USA cVisitors from University of Cyprus, Nicosia CY-1678, Cyprus dVisitors from University College Dublin, Dublin 4, Ireland eVisitors from University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom fVisitors from University of Fukui, Fukui City, Fukui Prefecture, Japan 910-0017 gVisitors from Kinki University, Higashi-Osaka City, Japan 577-8502 hVisitors from Universidad Iberoamericana, Mexico D.F., Mexico iVisitors from University of IA, IA City, IA 52242, USA jVisitors from Queen Mary, University of London, London, E1 4NS, England kVisitors from University of Manchester, Manchester M13 9PL, England lVisitors from Nagasaki Institute of Applied Science, Nagasaki, Japan mVisitors from University of Notre Dame, Notre Dame, IN 46556, USA nVisitors from University de Oviedo, E-33007 Oviedo, Spain oVisitors from TX Tech University, Lubbock, TX 79609, USA pVisitors from IFIC(CSIC-Universitat de Valencia), 46071 Valencia, Spain qVisitors from University of VA, Charlottesville, VA 22904, USA rVisitors from Bergische Universität Wuppertal, 42097 Wuppertal, Germany sVisitors from On leave from J. Stefan Institute, Ljubljana, Slovenia
See Also
|
|
