Phys. Rev. Lett.
93,
072001
(2004)
[6 pages]
Observation of the Narrow State X(3872)→J/ψπ+π- in p̅ p Collisions at √s=1.96 TeV
D. Acosta et al. CDF II Collaboration
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D. Acosta14, T. Affolder7, M. H. Ahn25, T. Akimoto52, M. G. Albrow13, D. Ambrose41, S. Amerio40, D. Amidei31, A. Anastassov48, K. Anikeev29, A. Annovi42, J. Antos1, M. Aoki52, G. Apollinari13, J-F. Arguin30, T. Arisawa54, A. Artikov11, T. Asakawa52, W. Ashmanskas2, A. Attal6, F. Azfar39, P. Azzi-Bacchetta40, N. Bacchetta40, H. Bachacou26, W. Badgett13, S. Bailey18, A. Barbaro-Galtieri26, G. Barker23, V. E. Barnes44, B. A. Barnett22, S. Baroiant5, M. Barone15, G. Bauer29, F. Bedeschi42, S. Behari22, S. Belforte51, W. H. Bell17, G. Bellettini42, J. Bellinger56, D. Benjamin12, A. Beretvas13, A. Bhatti46, M. Binkley13, D. Bisello40, M. Bishai13, R. E. Blair2, C. Blocker4, K. Bloom31, B. Blumenfeld22, A. Bocci46, A. Bodek45, G. Bolla44, A. Bolshov29, P. S. L. Booth27, D. Bortoletto44, J. Boudreau43, S. Bourov13, C. Bromberg32, E. Brubaker26, J. Budagov11, H. S. Budd45, K. Burkett13, G. Busetto40, P. Bussey17, K. L. Byrum2, S. Cabrera12, P. Calafiura26, M. Campanelli16, M. Campbell31, A. Canepa44, D. Carlsmith56, S. Carron12, R. Carosi42, M. Casarsa51, A. Castro3, P. Catastini42, D. Cauz51, A. Cerri26, C. Cerri42, L. Cerrito21, J. Chapman31, C. Chen41, Y. C. Chen1, M. Chertok5, G. Chiarelli42, G. Chlachidze11, F. Chlebana13, K. Cho25, D. Chokheli11, M. L. Chu1, J. Y. Chung36, W-H. Chung56, Y. S. Chung45, C. I. Ciobanu21, M. A. Ciocci42, A. G. Clark16, D. Clark4, M. N. Coca45, A. Connolly26, M. E. Convery46, J. Conway48, M. Cordelli15, G. Cortiana40, J. Cranshaw50, R. Culbertson13, C. Currat26, D. Cyr56, D. Dagenhart4, S. DaRonco40, S. D’Auria17, P. de Barbaro45, S. De Cecco47, G. De Lentdecker45, S. Dell’Agnello15, M. Dell’Orso42, S. Demers45, L. Demortier46, M. Deninno3, D. De Pedis47, P. F. Derwent13, C. Dionisi47, J. R. Dittmann13, P. Doksus21, A. Dominguez26, S. Donati42, M. D’Onofrio16, T. Dorigo40, V. Drollinger34, K. Ebina54, N. Eddy21, R. Ely26, R. Erbacher13, M. Erdmann23, D. Errede21, S. Errede21, R. Eusebi45, H-C. Fang26, S. Farrington27, I. Fedorko42, R. 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Spiropulu7, P. Squillacioti42, H. Stadie23, B. Stelzer30, O. Stelzer-Chilton30, J. Strologas34, D. Stuart7, A. Sukhanov14, K. Sumorok29, H. Sun53, T. Suzuki52, A. Taffard21, R. Tafirout30, S. F. Takach55, H. Takano52, R. Takashima20, Y. Takeuchi52, K. Takikawa52, P. Tamburello12, M. Tanaka2, R. Tanaka37, N. Tanimoto37, S. Tapprogge19, M. Tecchio31, P. K. Teng1, K. Terashi46, R. J. Tesarek13, S. Tether29, J. Thom13, A. S. Thompson17, E. Thomson36, R. Thurman-Keup2, P. Tipton45, V. Tiwari9, S. Tkaczyk13, D. Toback49, K. Tollefson32, D. Tonelli42, M. Tönnesmann32, S. Torre42, D. Torretta13, W. Trischuk30, J. Tseng29, R. Tsuchiya54, S. Tsuno52, D. Tsybychev14, N. Turini42, M. Turner27, F. Ukegawa52, T. Unverhau17, S. Uozumi52, D. Usynin41, L. Vacavant26, T. Vaiciulis45, A. Varganov31, E. Vataga42, S. Vejcik, III13, G. Velev13, G. Veramendi26, T. Vickey21, R. Vidal13, I. Vila8, R. Vilar8, I. Volobouev26, M. von der Mey6, R. G. Wagner2, R. L. Wagner13, W. Wagner23, N. Wallace48, T. Walter23, Z. Wan48, M. J. Wang1, S. M. Wang14, A. Warburton30, B. Ward17, S. Waschke17, D. Waters28, T. Watts48, M. Weber26, W. Wester13, B. Whitehouse53, A. B. Wicklund2, E. Wicklund13, H. H. Williams41, P. Wilson13, B. L. Winer36, P. Wittich41, S. Wolbers13, M. Wolter53, M. Worcester6, S. Worm48, T. Wright31, X. Wu16, F. Würthwein29, A. Wyatt28, A. Yagil13, T. Yamashita37, K. Yamamoto38, U. K. Yang10, W. Yao26, G. P. Yeh13, K. Yi22, J. Yoh13, P. Yoon45, K. Yorita54, T. Yoshida38, I. Yu25, S. Yu41, Z. Yu57, J. C. Yun13, L. Zanello47, A. Zanetti51, I. Zaw18, F. Zetti42, J. Zhou48, A. Zsenei16, and S. Zucchelli3 (CDF II Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
2Argonne National Laboratory, Argonne, Illinois 60439, USA
3Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
4Brandeis University, Waltham, Massachusetts 02254, USA
5University of California at Davis, Davis, California 95616, USA
6University of California at Los Angeles, Los Angeles, California 90024, USA
7University of California at Santa Barbara, Santa Barbara, California 93106, USA
8Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
10Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
11Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
12Duke University, Durham, North Carolina 27708, USA
13Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
14University of Florida, Gainesville, Florida 32611, USA
15Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
16University of Geneva, CH-1211 Geneva 4, Switzerland
17Glasgow University, Glasgow G12 8QQ, United Kingdom
18Harvard University, Cambridge, Massachusetts 02138, USA
19The Helsinki Group, Helsinki Institute of Physics, and Division of High Energy Physics, Department of Physical Sciences, University of Helsinki, FIN-00014 Helsinki, Finland
20Hiroshima University, Higashi-Hiroshima 724, Japan
21University of Illinois, Urbana, Illinois 61801, USA
22The Johns Hopkins University, Baltimore, Maryland 21218, USA
23Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
24High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan
25Center for High Energy Physics, Kyungpook National University, Taegu 702-701, Seoul National University, Seoul 151-742, and SungKyunKwan University, Suwon 440-746, Korea
26Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
27University of Liverpool, Liverpool L69 7ZE, United Kingdom
28University College London, London WC1E 6BT, United Kingdom
29Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
30Institute of Particle Physics, McGill University, Montréal, Canada H3A 2T8, and University of Toronto, Toronto, Canada M5S 1A7
31University of Michigan, Ann Arbor, Michigan 48109, USA
32Michigan State University, East Lansing, Michigan 48824, USA
33Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
34University of New Mexico, Albuquerque, New Mexico 87131, USA
35Northwestern University, Evanston, Illinois 60208, USA
36The Ohio State University, Columbus, Ohio 43210, USA
37Okayama University, Okayama 700-8530, Japan
38Osaka City University, Osaka 588, Japan
39University of Oxford, Oxford OX1 3RH, United Kingdom
40Universitá di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
41University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
42Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
43University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
44Purdue University, West Lafayette, Indiana 47907, USA
45University of Rochester, Rochester, New York 14627, USA
46The Rockefeller University, New York, New York 10021, USA
47Instituto Nazionale de Fisica Nucleare, Sezione di Roma, University di Roma I, “La Sapienza,” I-00185 Roma, Italy
48Rutgers University, Piscataway, New Jersey 08855, USA
49Texas A&M University, College Station, Texas 77843, USA
50Texas Tech University, Lubbock, Texas 79409, USA
51Istituto Nazionale di Fisica Nucleare, Universities of Trieste and Udine, Italy
52University of Tsukuba, Tsukuba, Ibaraki 305, Japan
53Tufts University, Medford, Massachusetts 02155, USA
54Waseda University, Tokyo 169, Japan
55Wayne State University, Detroit, Michigan 48201, USA
56University of Wisconsin, Madison, Wisconsin 53706, USA
57Yale University, New Haven, Connecticut 06520, USA
Received 4 December 2003; published 9 August 2004
We report the observation of a narrow state decaying into J/ψπ+π- and produced in 220 pb-1 of p̄p collisions at √s=1.96 TeV in the CDF II experiment. We observe 730±90 decays. The mass is measured to be 3871.3±0.7(stat)±0.4(syst) MeV/c2, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.072001
DOI:
10.1103/PhysRevLett.93.072001
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