Phys. Rev. Lett.
96,
171802
(2006)
[7 pages]
Search for Scalar Bottom Quarks from Gluino Decays in p̅ p Collisions at √s=1.96 TeV
A. Abulencia et al. CDF Collaboration
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A. Abulencia23, D. Acosta17, J. Adelman13, T. Affolder10, T. Akimoto54, M. G. Albrow16, D. Ambrose16, S. Amerio42, D. Amidei33, A. Anastassov51, K. Anikeev16, A. Annovi45, J. Antos1, M. Aoki54, G. Apollinari16, J.-F. Arguin32, T. Arisawa56, A. Artikov14, W. Ashmanskas16, A. Attal8, F. Azfar41, P. Azzi-Bacchetta42, P. Azzurri45, N. Bacchetta42, H. Bachacou28, W. Badgett16, A. Barbaro-Galtieri28, V. E. Barnes47, B. A. Barnett24, S. Baroiant7, V. Bartsch30, G. Bauer31, F. Bedeschi45, S. Behari24, S. Belforte53, G. Bellettini45, J. Bellinger58, A. Belloni31, E. Ben-Haim43, D. Benjamin15, A. Beretvas16, J. Beringer28, T. Berry29, A. Bhatti49, M. Binkley16, D. Bisello42, M. Bishai16, R. E. Blair2, C. Blocker6, K. Bloom33, B. Blumenfeld24, A. Bocci49, A. Bodek48, V. Boisvert48, G. Bolla47, A. Bolshov31, D. Bortoletto47, J. Boudreau46, S. Bourov16, A. Boveia10, B. Brau10, C. Bromberg34, E. Brubaker13, J. Budagov14, H. S. Budd48, S. Budd23, K. Burkett16, G. Busetto42, P. Bussey20, K. L. Byrum2, S. Cabrera15, M. Campanelli19, M. Campbell33, F. Canelli8, A. Canepa47, D. Carlsmith58, R. Carosi45, S. Carron15, M. Casarsa53, A. Castro5, P. Catastini45, D. Cauz53, M. Cavalli-Sforza3, A. Cerri28, L. Cerrito41, S. H. Chang27, J. Chapman33, Y. C. Chen1, M. Chertok7, G. Chiarelli45, G. Chlachidze14, F. Chlebana16, I. Cho27, K. Cho27, D. Chokheli14, J. P. Chou21, P. H. Chu23, S. H. Chuang58, K. Chung12, W. H. Chung58, Y. S. Chung48, M. Ciljak45, C. I. Ciobanu23, M. A. Ciocci45, A. Clark19, D. Clark6, M. Coca15, A. Connolly28, M. E. Convery49, J. Conway7, B. Cooper30, K. Copic33, M. Cordelli18, G. Cortiana42, A. Cruz17, J. Cuevas11, R. Culbertson16, D. Cyr58, S. DaRonco42, S. D’Auria20, M. D’onofrio19, D. Dagenhart6, P. de Barbaro48, S. De Cecco50, A. Deisher28, G. De Lentdecker48, M. Dell’Orso45, S. Demers48, L. Demortier49, J. Deng15, M. Deninno5, D. De Pedis50, P. F. Derwent16, C. Dionisi50, J. R. Dittmann4, P. DiTuro51, C. Dörr25, A. Dominguez28, S. Donati45, M. Donega19, P. Dong8, J. Donini42, T. Dorigo42, S. Dube51, K. Ebina56, J. Efron38, J. Ehlers19, R. Erbacher7, D. Errede23, S. Errede23, R. Eusebi48, H. C. Fang28, S. Farrington29, I. Fedorko45, W. T. Fedorko13, R. G. Feild59, M. Feindt25, J. P. Fernandez47, R. Field17, G. Flanagan34, L. R. Flores-Castillo46, A. Foland21, S. Forrester7, G. W. Foster16, M. Franklin21, J. C. Freeman28, Y. Fujii26, I. Furic13, A. Gajjar29, M. Gallinaro49, J. Galyardt12, J. E. Garcia45, M. Garcia Sciverez28, A. F. Garfinkel47, C. Gay59, H. Gerberich23, E. Gerchtein12, D. Gerdes33, S. Giagu50, G. P. di Giovanni43, P. Giannetti45, A. Gibson28, K. Gibson12, C. Ginsburg16, N. Giokaris14, K. Giolo47, M. Giordani53, M. Giunta45, G. Giurgiu12, V. Glagolev14, D. Glenzinski16, M. Gold36, N. Goldschmidt33, J. Goldstein41, G. Gomez11, G. Gomez-Ceballos11, M. Goncharov52, O. González47, I. Gorelov36, A. T. Goshaw15, Y. Gotra46, K. Goulianos49, A. Gresele42, M. Griffiths29, S. Grinstein21, C. Grosso-Pilcher13, U. Grundler23, J. 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Marino23, A. Martin59, M. Martin24, V. Martin37, M. Martínez3, T. Maruyama54, H. Matsunaga54, M. E. Mattson57, R. Mazini32, P. Mazzanti5, K. S. McFarland48, D. McGivern30, P. McIntyre52, P. McNamara51, R. McNulty29, A. Mehta29, S. Menzemer31, A. Menzione45, P. Merkel47, C. Mesropian49, A. Messina50, M. von der Mey8, T. Miao16, N. Miladinovic6, J. Miles31, R. Miller34, J. S. Miller33, C. Mills10, M. Milnik25, R. Miquel28, S. Miscetti18, G. Mitselmakher17, A. Miyamoto26, N. Moggi5, B. Mohr8, R. Moore16, M. Morello45, P. Movilla Fernandez28, J. Mülmenstädt28, A. Mukherjee16, M. Mulhearn31, Th. Muller25, R. Mumford24, A. Munar44, P. Murat16, J. Nachtman16, S. Nahn59, I. Nakano39, A. Napier55, D. Naumov36, V. Necula17, C. Neu44, M. S. Neubauer9, J. Nielsen28, T. Nigmanov46, L. Nodulman2, O. Norniella3, T. Ogawa56, S. H. Oh15, Y. D. Oh27, T. Okusawa40, R. Oldeman29, R. Orava22, K. Osterberg22, C. Pagliarone45, E. Palencia11, R. Paoletti45, V. Papadimitriou16, A. Papikonomou25, A. A. 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Toback52, S. Tokar14, K. Tollefson34, T. Tomura54, D. Tonelli45, M. Tönnesmann34, S. Torre45, D. Torretta16, S. Tourneur43, W. Trischuk32, R. Tsuchiya56, S. Tsuno39, N. Turini45, F. Ukegawa54, T. Unverhau20, S. Uozumi54, D. Usynin44, L. Vacavant28, A. Vaiciulis48, S. Vallecorsa19, A. Varganov33, E. Vataga36, G. Velev16, G. Veramendi23, V. Veszpremi47, T. Vickey23, R. Vidal16, I. Vila11, R. Vilar11, I. Vollrath32, I. Volobouev28, F. Würthwein9, P. Wagner52, R. G. Wagner2, R. L. Wagner16, W. Wagner25, R. Wallny8, T. Walter25, Z. Wan51, M. J. Wang1, S. M. Wang17, A. Warburton32, B. Ward20, S. Waschke20, D. Waters30, T. Watts51, M. Weber28, W. C. Wester, III16, B. Whitehouse55, D. Whiteson44, A. B. Wicklund2, E. Wicklund16, H. H. Williams44, P. Wilson16, B. L. Winer38, P. Wittich44, S. Wolbers16, C. Wolfe13, S. Worm51, T. Wright33, X. Wu19, S. M. Wynne29, A. Yagil16, K. Yamamoto40, J. Yamaoka51, Y. Yamashita39, C. Yang59, U. K. Yang13, W. M. Yao28, G. P. Yeh16, J. Yoh16, K. Yorita13, T. Yoshida40, I. Yu27, S. S. Yu44, J. C. Yun16, L. Zanello50, A. Zanetti53, I. Zaw21, F. Zetti45, X. Zhang23, J. Zhou51, 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
14Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
15Duke University, Durham, North Carolina 27708
16Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
17University of Florida, Gainesville, Florida 32611, USA
18Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
19University of Geneva, CH-1211 Geneva 4, Switzerland
20Glasgow University, Glasgow G12 8QQ, United Kingdom
21Harvard University, Cambridge, Massachusetts 02138, USA
22Division of High Energy Physics, Department of Physics, University of Helsinki , FIN-00014, Helsinki, Finland and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
23University of Illinois, Urbana, Illinois 61801, USA
24The Johns Hopkins University, Baltimore, Maryland 21218, USA
25Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
26High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan
27Center 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
28Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
29University of Liverpool, Liverpool L69 7ZE, United Kingdom
30University College London, London WC1E 6BT, United Kingdom
31Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
32Institute of Particle Physics: McGill University, Montréal, Canada H3A 2T8; and University of Toronto, Toronto, Canada M5S 1A7
33University of Michigan, Ann Arbor, Michigan 48109, USA
34Michigan State University, East Lansing, Michigan 48824, USA
35Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
36University of New Mexico, Albuquerque, New Mexico 87131, USA
37Northwestern University, Evanston, Illinois 60208, USA
38The Ohio State University, Columbus, Ohio 43210, USA
39Okayama University, Okayama 700-8530, Japan
40Osaka City University, Osaka 588, Japan
41University of Oxford, Oxford OX1 3RH, United Kingdom
42University of Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
43LPNHE-Universite de Paris 6/IN2P3-CNRS, Paris, France
44University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
45Istituto Nazionale di Fisica Nucleare Pisa, Universities of Pisa, Siena and Scuola Normale Superiore, I-56127 Pisa, Italy
46University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
47Purdue University, West Lafayette, Indiana 47907, USA
48University of Rochester, Rochester, New York 14627, USA
49The Rockefeller University, New York, New York 10021, USA
50Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, University of Rome “La Sapienza,” I-00185 Roma, Italy
51Rutgers University, Piscataway, New Jersey 08855, USA
52Texas A&M University, College Station, Texas 77843, USA
53Istituto Nazionale di Fisica Nucleare, University of Trieste/Udine, Italy
54University of Tsukuba, Tsukuba, Ibaraki 305, Japan
55Tufts University, Medford, Massachusetts 02155, USA
56Waseda University, Tokyo 169, Japan
57Wayne State University, Detroit, Michigan 48201, USA
58University of Wisconsin, Madison, Wisconsin 53706, USA
59Yale University, New Haven, Connecticut 06520, USA
Received 28 December 2005; published 4 May 2006
We searched for scalar bottom quarks in 156 pb-1 of p̅ p collisions at √s=1.96 TeV recorded by the Collider Detector at Fermilab II experiment at the Tevatron. Scalar bottom quarks can be produced from gluino decays in R-parity conserving models of supersymmetry when the mass of the gluino exceeds that of the scalar bottom quark. Then, a scalar bottom quark can decay into a bottom quark and a neutralino. To search for this scenario, we investigated events with large missing transverse energy and at least three jets, two or more of which were identified as containing a secondary vertex from the hadronization of b quarks. We found four candidate events, where 2.6±0.7 are expected from standard model processes, and placed 95% confidence level lower limits on gluino and scalar bottom quark masses of up to 280 and 240 GeV/c2, respectively.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.171802
DOI:
10.1103/PhysRevLett.96.171802
PACS:
12.60.Jv, 13.85.Rm, 14.80.Ly
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