Phys. Rev. D
76,
072006
(2007)
[24 pages]
Search for new particles leading to Z+jets final states in pp̅ collisions at √s=1.96 TeV
T. Aaltonen et al. CDF Collaboration
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T. Aaltonen23, A. Abulencia24, J. Adelman13, T. Affolder10, T. Akimoto55, M. G. Albrow17, S. Amerio43, D. Amidei35, A. Anastassov52, K. Anikeev17, A. Annovi19, J. Antos14, M. Aoki55, G. Apollinari17, T. Arisawa57, A. Artikov15, W. Ashmanskas17, A. Attal3, A. Aurisano53, F. Azfar42, P. Azzi-Bacchetta43, P. Azzurri46, N. Bacchetta43, W. Badgett17, A. Barbaro-Galtieri29, V. E. Barnes48, B. A. Barnett25, S. Baroiant7, V. Bartsch31, G. Bauer33, P.-H. Beauchemin34, F. Bedeschi46, S. Behari25, G. Bellettini46, J. Bellinger59, A. Belloni33, D. Benjamin16, A. Beretvas17, J. Beringer29, T. Berry30, A. Bhatti50, M. Binkley17, D. Bisello43, I. Bizjak31, R. E. Blair2, C. Blocker6, B. Blumenfeld25, A. Bocci16, A. Bodek49, V. Boisvert49, G. Bolla48, A. Bolshov33, D. Bortoletto48, J. Boudreau47, A. Boveia10, B. Brau10, L. Brigliadori5, C. Bromberg36, E. Brubaker13, J. Budagov15, H. S. Budd49, S. Budd24, K. Burkett17, G. Busetto43, P. Bussey21, A. Buzatu34, K. L. Byrum2, S. Cabrera16,j, M. Campanelli20, M. Campbell35, F. Canelli17, A. Canepa45, S. Carrillo18,b, D. Carlsmith59, R. Carosi46, S. Carron34, B. Casal11, M. Casarsa54, A. Castro5, P. Catastini46, D. Cauz54, M. Cavalli-Sforza3, A. Cerri29, L. Cerrito31,f, S. H. Chang28, Y. C. Chen1, M. Chertok7, G. Chiarelli46, G. Chlachidze17, F. Chlebana17, I. Cho28, K. Cho28, D. Chokheli15, J. P. Chou22, G. Choudalakis33, S. H. Chuang52, K. Chung12, W. H. Chung59, Y. S. Chung49, M. Cilijak46, C. I. Ciobanu24, M. A. Ciocci46, A. Clark20, D. Clark6, M. Coca16, G. Compostella43, M. E. Convery50, J. Conway7, B. Cooper31, K. Copic35, M. Cordelli19, G. Cortiana43, F. Crescioli46, C. Cuenca Almenar7,j, J. Cuevas11,e, R. Culbertson17, J. C. Cully35, S. DaRonco43, M. Datta17, S. D’Auria21, T. Davies21, D. Dagenhart17, P. de Barbaro49, S. De Cecco51, A. Deisher29, G. De Lentdecker49,‡, G. De Lorenzo3, M. Dell’Orso46, F. Delli Paoli43, L. Demortier50, J. Deng16, M. Deninno5, D. De Pedis51, P. F. Derwent17, G. P. Di Giovanni44, C. 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Marginean17, C. Marino26, C. P. Marino24, A. Martin60, M. Martin25, V. Martin21,‡‡, M. Martínez3, R. Martínez-Ballarín32, T. Maruyama55, P. Mastrandrea51, T. Masubuchi55, H. Matsunaga55, M. E. Mattson58, R. Mazini34, P. Mazzanti5, K. S. McFarland49, P. McIntyre53, R. McNulty30,††, A. Mehta30, P. Mehtala23, S. Menzemer11,a, A. Menzione46, P. Merkel48, C. Mesropian50, A. Messina36, T. Miao17, N. Miladinovic6, J. Miles33, R. Miller36, C. Mills10, M. Milnik26, A. Mitra1, G. Mitselmakher18, A. Miyamoto27, S. Moed20, N. Moggi5, B. Mohr8, C. S. Moon28, R. Moore17, M. Morello46, P. Movilla Fernandez29, J. Mülmenstädt29, A. Mukherjee17, Th. Muller26, R. Mumford25, P. Murat17, M. Mussini5, J. Nachtman17, A. Nagano55, J. Naganoma57, K. Nakamura55, I. Nakano40, A. Napier56, V. Necula16, C. Neu45, M. S. Neubauer9, J. Nielsen29,h, L. Nodulman2, O. Norniella3, E. Nurse31, S. H. Oh16, Y. D. Oh28, I. Oksuzian18, T. Okusawa41, R. Oldeman30, R. Orava23, K. Osterberg23, C. Pagliarone46, E. Palencia11, V. 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Tsuno40, Y. Tu45, N. Turini46, F. Ukegawa55, S. Uozumi55, S. Vallecorsa20, N. van Remortel23, A. Varganov35, E. Vataga37, F. Vazquez18,b, G. Velev17, C. Vellidis46,*, G. Veramendi24, V. Veszpremi48, M. Vidal32, R. Vidal17, I. Vila11, R. Vilar11, T. Vine31, M. Vogel37, I. Vollrath34, I. Volobouev29,h, G. Volpi46, F. Würthwein9, P. Wagner53, R. G. Wagner2, R. L. Wagner17, J. Wagner26, W. Wagner26, R. Wallny8, S. M. Wang1, A. Warburton34, D. Waters31, M. Weinberger53, W. C. Wester, III17, B. Whitehouse56, D. Whiteson45,i, A. B. Wicklund2, E. Wicklund17, G. Williams34, H. H. Williams45, P. Wilson17, B. L. Winer39, P. Wittich17,§, S. Wolbers17, C. Wolfe13, T. Wright35, X. Wu20, S. M. Wynne30, A. Yagil9, K. Yamamoto41, J. Yamaoka52, T. Yamashita40, C. Yang60, U. K. Yang13,c, Y. C. Yang28, W. M. Yao29, G. P. Yeh17, J. Yoh17, K. Yorita13, T. Yoshida41, G. B. Yu49, I. Yu28, S. S. Yu17, J. C. Yun17, L. Zanello51, A. Zanetti54, I. Zaw22, X. Zhang24, J. Zhou52, 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 and Institute of Experimental Physics, 040 01 Kosice, Slovakia 15Joint Institute for Nuclear Research, RU-141980 Dubna, Russia 16Duke University, Durham, North Carolina 27708, USA 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, and 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, 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
Received 25 June 2007; published 18 October 2007
We present the results of a search for new particles that lead to a Z boson plus jets in pp̅ collisions at √s=1.96 TeV using the Collider Detector at Fermilab (CDF II). A data sample with a luminosity of 1.06 fb-1 collected using Z boson decays to ee and μμ is used. We describe a completely data-based method to predict the dominant background from standard model Z+jet events. This method can be similarly applied to other analyses requiring background predictions in multijet environments, as shown when validating the method by predicting the background from W+jets in tt̅ production. No significant excess above the background prediction is observed, and a limit is set using a fourth generation quark model to quantify the acceptance. Assuming BR(b′→bZ)=100% and using a leading-order calculation of the b′ cross section, b′ quark masses below 268 GeV/c2 are excluded at 95% confidence level.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.76.072006
DOI:
10.1103/PhysRevD.76.072006
PACS:
13.85.Rm, 13.85.Qk, 14.70.Hp, 14.80.−j
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