Phys. Rev. Lett.
93,
242001
(2004)
[5 pages]
Observation of a Narrow Charm-Strange Meson DsJ+(2632)→Ds+η and D0K+
A. V. Evdokimov et al. SELEX Collaboration
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A. V. Evdokimov8, U. Akgun16, G. Alkhazov11, J. Amaro-Reyes13, A. G. Atamantchouk11,*, A. S. Ayan16, 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,§, 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. Kushnirenko3,6, 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, M. Mattson3, 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, Y. Onel16, E. Ozel16, S. Ozkorucuklu16,e, A. Penzo20, S. V. Petrenko6, P. Pogodin16, M. Procario3,f, E. Ramberg5, G. F. Rappazzo20, B. V. Razmyslovich11,g, V. I. Rud10, J. Russ3, P. Schiavon20, J. Simon9,h, A. I. Sitnikov8, D. Skow5, V. J. Smith15, M. Srivastava19, V. Steiner12, V. Stepanov11,g, L. Stutte5, M. Svoiski11,g, N. K. Terentyev11,3, G. P. Thomas1, I. Torres13, L. N. Uvarov11, A. N. Vasiliev6, D. V. Vavilov6, E. Vázquez-Jáuregui13, V. S. Verebryusov8, V. A. Victorov6, V. E. Vishnyakov8, A. A. Vorobyov11, K. Vorwalter9,i, J. You3,5, Zhao Wenheng7, Zheng Shuchen7, and R. Zukanovich-Funchal19 (SELEX Collaboration)
1Ball State University, Muncie, IN 47306, USA
2Bogazici University, Bebek 80815 Istanbul, Turkey
3Carnegie-Mellon University, Pittsburgh, PA 15213, USA
4Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
5Fermi National Accelerator Laboratory, Batavia, IL 60510, USA
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, IA 52242, USA
17University of Michigan-Flint, Flint, MI 48502, USA
18University of Rome “La Sapienza” and INFN, Rome, Italy
19University of São Paulo, São Paulo, Brazil
20University of Trieste and INFN, Trieste, Italy
Received 17 June 2004; published 10 December 2004
We report the first observation of a charm-strange meson DsJ+(2632) at a mass of 2632.5±1.7 MeV/c2 in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, Ds+η and D0K+. In the Ds+η decay mode we observe a peak with 101 events over a combinatoric background of 54.9 events at a mass of 2635.4±3.3 MeV/c2. There is a corresponding peak of 21 events over a background of 6.9 at 2631.5±2.0 MeV/c2 in the decay mode D0K+. The decay width of this state is <17 MeV/c2 at 90% confidence level. The relative branching ratio Γ(D0K+)/Γ(Ds+η) is 0.14±0.06. The mechanism that keeps this state narrow is unclear. Its decay pattern is also unusual, being dominated by the Ds+η decay mode.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.242001
DOI:
10.1103/PhysRevLett.93.242001
PACS:
13.25.Ft, 13.30.Eg, 14.40.Lb
*Deceased. †Present address: Advanced Mask Technology Center, Dresden, Germany. ‡Present address: University of CA at Irvine, Irvine, CA 92697, USA. §Present address: Instituto de Física da Universidade Estadual de Campinas, UNICAMP, SP, Brazil. **Present address: Kafkas University, Kars, Turkey. ††Present address: Physik-Department, Technische Universität München, 85748 Garching, Germany. ‡‡Present address: The Boston Consulting Group, München, Germany. aPresent address: Lucent Technologies, Naperville, IL. bPresent address: SPSS Inc., Chicago, IL. cPresent address: University of AL at Birmingham, Birmingham, AL 35294. dPresent address: Sheba Medical Center, Tel-Hashomer, Israel. ePresent address: Süleyman Demirel Universitesi, Isparta, Turkey. fPresent address: DOE, Germantown, MD. gPresent address: Solidum, Ottawa, Ontario, Canada. hPresent address: Siemens Medizintechnik, Erlangen, Germany. iPresent address: Allianz Insurance Group IT, München, Germany.
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