Phys. Rev. Lett.
94,
101802
(2005)
[7 pages]
Search for Excited and Exotic Electrons in the eγ Decay Channel in pp̅ Collisions at √s=1.96 TeV
D. Acosta et al. CDF Collaboration
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D. Acosta16, J. Adelman12, T. Affolder9, T. Akimoto54, M. G. Albrow15, D. Ambrose43, S. Amerio42, D. Amidei33, A. Anastassov50, K. Anikeev31, A. Annovi44, J. Antos1, M. Aoki54, G. Apollinari15, T. Arisawa56, J-F. Arguin32, A. Artikov13, W. Ashmanskas15, A. Attal7, F. Azfar41, P. Azzi-Bacchetta42, N. Bacchetta42, H. Bachacou28, W. Badgett15, A. Barbaro-Galtieri28, G. J. Barker25, V. E. Barnes46, B. A. Barnett24, S. Baroiant6, M. Barone17, G. Bauer31, F. Bedeschi44, S. Behari24, S. Belforte53, G. Bellettini44, J. Bellinger58, E. Ben-Haim15, D. Benjamin14, A. Beretvas15, A. Bhatti48, M. Binkley15, D. Bisello42, M. Bishai15, R. E. Blair2, C. Blocker5, K. Bloom33, B. Blumenfeld24, A. Bocci48, A. Bodek47, G. Bolla46, A. Bolshov31, P. S. L. Booth29, D. Bortoletto46, J. Boudreau45, S. Bourov15, C. Bromberg34, E. Brubaker12, J. Budagov13, H. S. Budd47, K. Burkett15, G. Busetto42, P. Bussey19, K. L. Byrum2, S. Cabrera14, M. Campanelli18, M. Campbell33, A. Canepa46, M. Casarsa53, D. Carlsmith58, S. Carron14, R. Carosi44, M. Cavalli-Sforza3, A. Castro4, P. Catastini44, D. Cauz53, A. Cerri28, C. Cerri44, L. Cerrito23, J. Chapman33, C. Chen43, Y. C. Chen1, M. Chertok6, G. Chiarelli44, G. Chlachidze13, F. Chlebana15, I. Cho27, K. Cho27, D. Chokheli13, M. L. Chu1, S. Chuang58, J. Y. Chung38, W-H. Chung58, Y. S. Chung47, C. I. Ciobanu23, M. A. Ciocci44, A. G. Clark18, D. Clark5, M. Coca47, A. Connolly28, M. Convery48, J. Conway6, B. Cooper30, M. Cordelli17, G. Cortiana42, J. Cranshaw52, J. Cuevas10, R. Culbertson15, C. Currat28, D. Cyr58, D. Dagenhart5, S. Da Ronco42, S. D’Auria19, P. de Barbaro47, S. De Cecco49, G. De Lentdecker47, S. Dell’Agnello17, M. Dell’Orso44, S. Demers47, L. Demortier48, M. Deninno4, D. De Pedis49, P. F. Derwent15, C. Dionisi49, J. R. Dittmann15, P. Doksus23, A. Dominguez28, S. Donati44, M. Donega18, J. Donini42, M. D’Onofrio18, T. Dorigo42, V. Drollinger36, K. Ebina56, N. Eddy23, R. Ely28, R. Erbacher6, M. Erdmann25, D. Errede23, S. 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Zucchelli4 (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
4Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
5Brandeis University, Waltham, Massachusetts 02254, USA
6University of California at Davis, Davis, California 95616, USA
7University of California at Los Angeles, Los Angeles, California 90024, USA
8University of California at San Diego, La Jolla, California 92093, USA
9University of California at Santa Barbara, Santa Barbara, California 93106, USA
10Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
11Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
12Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
13Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
14Duke University, Durham, North Carolina 27708
15Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
16University of Florida, Gainesville, Florida 32611, USA
17Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
18University of Geneva, CH-1211 Geneva 4, Switzerland
19Glasgow University, Glasgow G12 8QQ, United Kingdom
20Harvard University, Cambridge, Massachusetts 02138, USA
21The Helsinki Group, Helsinki Institute of Physics, FIN-00044, Helsinki, Finland and Division of High Energy Physics, Department of Physical Sciences, University of Helsinki, FIN-00044, Helsinki, Finland
22Hiroshima University, Higashi-Hiroshima 724, Japan
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
42Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, University of Padova, I-35131 Padova, Italy
43University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
44Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
45University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
46Purdue University, West Lafayette, Indiana 47907, USA
47University of Rochester, Rochester, New York 14627, USA
48The Rockefeller University, New York, New York 10021, USA
49Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, University di Roma “La Sapienza”, I-00185 Roma, Italy
50Rutgers University, Piscataway, New Jersey 08855, USA
51Texas A&M University, College Station, Texas 77843, USA
52Texas Tech University, Lubbock, Texas 79409, 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 6 October 2004; published 16 March 2005
We present a search for excited and exotic electrons (e*) decaying to an electron and a photon, both with high transverse momentum. We use 202 pb-1 of data collected in pp̅ collisions at √s=1.96 TeV with the Collider Detector at Fermilab II detector. No signal above standard model expectation is seen for associated ee* production. We discuss the e* sensitivity in the parameter space of the excited electron mass Me* and the compositeness energy scale Λ. In the contact interaction model, we exclude 132 GeV/c2<Me*<879 GeV/c2 for Λ=Me* at 95% confidence level (C.L.). In the gauge-mediated model, we exclude 126 GeV/c2<Me*<430 GeV/c2 at 95% C.L. for the phenomenological coupling f/Λ≈10-2 GeV-1.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.101802
DOI:
10.1103/PhysRevLett.94.101802
PACS:
14.60.Hi, 12.60.Rc, 13.85.Qk, 12.60.-i
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