Phys. Rev. Lett.
89,
112001
(2002)
[5 pages]
First Observation of the Doubly Charmed Baryon Ξcc+
M. Mattson et al. SELEX Collaboration
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M. Mattson3, G. Alkhazov11, A. G. Atamantchouk11,*, M. Y. Balatz8,*, N. F. Bondar11, P. S. Cooper5, L. J. Dauwe17, G. V. Davidenko8, U. Dersch9,†, A. G. Dolgolenko8, G. B. Dzyubenko8, R. Edelstein3, L. Emediato19, A. M. F. Endler4, J. Engelfried13,5, I. Eschrich9,‡, C. O. Escobar19,§, A. V. Evdokimov8, I. S. Filimonov10,*, F. G. Garcia19,5, M. Gaspero18, I. Giller12, V. L. Golovtsov11, P. Gouffon19, E. Gülmez2, He Kangling7, M. Iori18, S. Y. Jun3, M. Kaya16, J. Kilmer5, V. T. Kim11, L. M. Kochenda11, I. Konorov9,**, A. P. Kozhevnikov6, A. G. Krivshich11, H. Krüger9,††, M. A. Kubantsev8, V. P. Kubarovsky6, A. I. Kulyavtsev3,5, N. P. Kuropatkin11,5, V. F. Kurshetsov6, A. Kushnirenko3, S. Kwan5, J. Lach5, A. Lamberto20, L. G. Landsberg6, I. Larin8, E. M. Leikin10, Li Yunshan7, M. Luksys14, T. Lungov19,‡‡, V. P. Maleev11, D. Mao3,a, Mao Chensheng7, Mao Zhenlin7, P. Mathew3,b, V. Matveev8, E. McCliment16, M. A. Moinester12, V. V. Molchanov6, A. Morelos13, K. D. Nelson16,c, A. V. Nemitkin10, P. V. Neoustroev11, C. Newsom16, A. P. Nilov8, S. B. Nurushev6, A. Ocherashvili12,d, E. Oliveira4, Y. Onel16, E. Ozel16, S. Ozkorucuklu16, A. Penzo20, S. V. Petrenko6, P. Pogodin16, M. Procario3,e, V. A. Prutskoi8, E. Ramberg5, G. F. Rappazzo20, B. V. Razmyslovich11,f, V. I. Rud10, J. Russ3, P. Schiavon20, J. Simon9,g, A. I. Sitnikov8, D. Skow5, V. J. Smith15, M. Srivastava19, V. Steiner12, V. Stepanov11,f, L. Stutte5, M. Svoiski11,f, N. K. Terentyev11,3, G. P. Thomas1, L. N. Uvarov11, A. N. Vasiliev6, D. V. Vavilov6, V. S. Verebryusov8, V. A. Victorov6, V. E. Vishnyakov8, A. A. Vorobyov11, K. Vorwalter9,h, J. You3,5, Zhao Wenheng7, Zheng Shuchen7, and R. Zukanovich-Funchal19 (SELEX Collaboration)
1Ball State University, Muncie, Indiana 47306
2Bogazici University, Bebek 80815 Istanbul, Turkey
3Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
4Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
5Fermi National Accelerator Laboratory, Batavia, Illinois 60510
6Institute for High Energy Physics, Protvino, Russia
7Institute of High Energy Physics, Beijing, People’s Republic of China
8Institute of Theoretical and Experimental Physics, Moscow, Russia
9Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
10Moscow State University, Moscow, Russia
11Petersburg Nuclear Physics Institute, St. Petersburg, Russia
12Tel Aviv University, 69978 Ramat Aviv, Israel
13Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
14Universidade Federal da Paraíba, Paraíba, Brazil
15University of Bristol, Bristol BS8 1TL, United Kingdom
16University of Iowa, Iowa City, Iowa 52242
17University of Michigan-Flint, Flint, Michigan 48502
18University of Rome “La Sapienza” and INFN, Rome, Italy
19University of São Paulo, São Paulo, Brazil
20University of Trieste and INFN, Trieste, Italy
Received 22 July 2002; published 20 August 2002
We observe a signal for the doubly charmed baryon Ξcc+ in the charged decay mode Ξcc+→Λc+K-π+ in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of 6.1±0.5 events, a statistical significance of 6.3σ. The observed mass of this state is 3519±1 MeV/c2. The Gaussian mass width of this state is 3 MeV/c2, consistent with resolution; its lifetime is less than 33 fs at 90% confidence.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.112001
DOI:
10.1103/PhysRevLett.89.112001
*Deceased. †Present address: Infinion, München, Germany. ‡Present address: Imperial College, London SW7 2BZ, U.K. §Present address: Instituto de Física da Universidade Estadual de Campinas, UNICAMP, SP, Brazil. **Present address: Physik-Department, Technische Universität München, 85748 Garching, Germany. ††Present address: The Boston Consulting Group, München, Germany. ‡‡Present address: Instituto de Física Teórica da Universidade Estadual Paulista, São Paulo, Brazil. aPresent address: Lucent Technologies, Naperville, IL. bPresent address: SPSS Inc., Chicago, IL. cPresent address: University of Alabama at Birmingham, Birmingham, AL 35294. dPresent address: Imadent Ltd., Rehovot 76702, Israel. ePresent address: DOE, Germantown, MD. fPresent address: Solidum, Ottawa, Ontario, Canada. gPresent address: Siemens Medizintechnik, Erlangen, Germany. hPresent address: Deutsche Bank AG, Eschborn, Germany.
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