First Observation of the Doubly Charmed Baryon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Ξ</mml:mi><mml:mrow><mml:mi>c</mml:mi><mml:mi>c</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msubsup></mml:math>
M. E. Mattson(Carnegie Mellon University), G. Alkhazov(Petersburg Nuclear Physics Institute), A. G. Atamantchouk(Petersburg Nuclear Physics Institute), M.Y. Balatz(Institute for Theoretical and Experimental Physics), Nikolay Bondar(Petersburg Nuclear Physics Institute), P. S. Cooper(Fermi National Accelerator Laboratory), L. Dauwe(University of Michigan–Flint), G.V. Davidenko(Institute for Theoretical and Experimental Physics), U. Dersch(Max Planck Institute for Nuclear Physics), A. Dolgolenko(Institute for Theoretical and Experimental Physics), G.B. Dzyubenko(Institute for Theoretical and Experimental Physics), R. Edelstein(Carnegie Mellon University), Luiz Emediato(Universidade de São Paulo), A. M. F. Endler(Centro Brasileiro de Pesquisas Físicas), J. Engelfried(Fermi National Accelerator Laboratory), I. Eschrich(Max Planck Institute for Nuclear Physics), C. O. Escobar(Universidade de São Paulo), A. Evdokimov(Institute for Theoretical and Experimental Physics), I. S. Filimonov(Lomonosov Moscow State University), F. G. Garcia(Fermi National Accelerator Laboratory), M. Gaspero(Sapienza University of Rome), I. Giller(Tel Aviv University), V. L. Golovtsov(Petersburg Nuclear Physics Institute), P. Gouffon(Universidade de São Paulo), E. Gülmez(Boğaziçi University), Kangling He(Institute of High Energy Physics), M. Iori(Sapienza University of Rome), S. Y. Jun(Carnegie Mellon University), M. Kaya(University of Iowa), J. Kilmer(Fermi National Accelerator Laboratory), V. Kim(Petersburg Nuclear Physics Institute), L. M. Kochenda(Petersburg Nuclear Physics Institute), I. Konorov(Max Planck Institute for Nuclear Physics), А. П. Кожевников(Institute for High Energy Physics), A. Krivshich(Petersburg Nuclear Physics Institute), H. Krüger(Max Planck Institute for Nuclear Physics), M. Kubantsev(Institute for Theoretical and Experimental Physics), Valery Kubarovsky(Institute for High Energy Physics), A. I. Kulyavtsev(Fermi National Accelerator Laboratory), N.P. Kuropatkin(Fermi National Accelerator Laboratory), V. F. Kurshetsov(Institute for High Energy Physics), A. Kushnirenko(Carnegie Mellon University), S. Kwan(Fermi National Accelerator Laboratory), J. Lach(Fermi National Accelerator Laboratory), A. Lamberto(University of Trieste), L.G. Landsberg(Institute for High Energy Physics), I. Larin(Institute for Theoretical and Experimental Physics), E.M. Leikin(Lomonosov Moscow State University), Yunshan Li(Institute of High Energy Physics), M. Luksys(Universidade Federal da Paraíba), T. Lungov(Universidade de São Paulo), V. P. Maleev(Petersburg Nuclear Physics Institute), Dan Mao(Carnegie Mellon University), Chensheng Mao(Institute of High Energy Physics), Zhenlin Mao(Institute of High Energy Physics), P. Mathew(Carnegie Mellon University), V. Matveev(Institute for Theoretical and Experimental Physics), E. McCliment(University of Iowa), M. A. Moinester(Tel Aviv University), V. V. Molchanov(Institute for High Energy Physics), A. Morelos(Autonomous University of San Luis Potosí), K. D. Nelson(University of Iowa), A.V. Nemitkin(Lomonosov Moscow State University), P. V. Neoustroev(Petersburg Nuclear Physics Institute), C. R. Newsom(University of Iowa), A.P. Nilov(Institute for Theoretical and Experimental Physics), S. B. Nurushev(Institute for High Energy Physics), A. Ocherashvili(Tel Aviv University), Emmanuel de Oliveira(Centro Brasileiro de Pesquisas Físicas), Y. Onel(University of Iowa), E. Ozel(University of Iowa), S. Özkorucuklu(University of Iowa), A. Penzo(University of Trieste), S. V. Petrenko(Institute for High Energy Physics), P. Pogodin(University of Iowa), M. Procario(Carnegie Mellon University), V. A. Prutskoi(Institute for Theoretical and Experimental Physics), E. Ramberg(Fermi National Accelerator Laboratory), G.F. Rappazzo(University of Trieste), B. V. Razmyslovich(Petersburg Nuclear Physics Institute), V. I. Ruď(Lomonosov Moscow State University), J. Russ(Carnegie Mellon University), P. Schiavon(University of Trieste), J. Simon(Max Planck Institute for Nuclear Physics), А. И. Ситников(Institute for Theoretical and Experimental Physics), D. Skow(Fermi National Accelerator Laboratory), V. J. Smith(University of Bristol), M. K. Srivastava(Universidade de São Paulo), V. Steiner(Tel Aviv University), В. В. Степанов(Petersburg Nuclear Physics Institute), L. Stutte(Fermi National Accelerator Laboratory), M. Svoiski(Petersburg Nuclear Physics Institute), N. K. Terentyev(Petersburg Nuclear Physics Institute), G. Thomas(Ball State University), L. N. Uvarov(Petersburg Nuclear Physics Institute), A. N. Vasiliev(Institute for High Energy Physics), D. V. Vavilov(Institute for High Energy Physics), V.S. Verebryusov(Institute for Theoretical and Experimental Physics), V.A. Victorov(Institute for High Energy Physics), V.E. Vishnyakov(Institute for Theoretical and Experimental Physics), A.A. Vorobyov(Petersburg Nuclear Physics Institute), K. Vorwalter(Max Planck Institute for Nuclear Physics), J.M. You(Fermi National Accelerator Laboratory), W. Zhao(Institute of High Energy Physics), Shuchen Zheng(Institute of High Energy Physics), R. Zukanovich Funchal(Universidade de São Paulo)
Cited by 422Open Access
Abstract
We observe a signal for the doubly charmed baryon ${\ensuremath{\Xi}}_{cc}^{+}$ in the charged decay mode ${\ensuremath{\Xi}}_{cc}^{+}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}_{c}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ in data from SELEX, the charm hadroproduction experiment at Fermilab. We observe an excess of 15.9 events over an expected background of $6.1\ifmmode\pm\else\textpm\fi{}0.5$ events, a statistical significance of $6.3\ensuremath{\sigma}$. The observed mass of this state is $3519\ifmmode\pm\else\textpm\fi{}1\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$. The Gaussian mass width of this state is $3\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$, consistent with resolution; its lifetime is less than 33 fs at 90% confidence.
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