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M. Mattson, G. Alkhazov, A. G. Atamantchouk, M. Y. Balatz, N. F. Bondar, P. S. Cooper, L. J. Dauwe, G. V. Davidenko, U. Dersch, A. G. Dolgolenko, G. B. Dzyubenko, R. Edelstein, L. Emediato, A. M. F. Endler, J. Engelfried, I. Eschrich, C. O. Escobar, A. V. Evdokimov, I. S. Filimonov, F. G. Garcia, M. Gaspero, I. Giller, V. L. Golovtsov, P. Gouffon, E.(More)
We observe a signal for the doubly charmed baryon Xi(+)(cc) in the charged decay mode Xi(+)(cc)-->Lambda(+)(c)K-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+/-0.5 events, a statistical significance of 6.3sigma. The observed mass of this state is 3519+/-1(More)
We report the first observation of a charm-strange meson D(+)(sJ)(2632) at a mass of 2632.5+/-1.7 MeV/c(2) in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, D(+)(s)eta and D0K+. In the D(+)(s)eta decay mode we observe a peak with 101 events over a combinatoric background of 54.9 events at a(More)
A search for narrow Θ(1540) , a candidate for pentaquark baryon with positive strangeness, has been performed in an exclusive proton-induced reaction p+C(N) → ΘK̄ +C(N) on carbon nuclei or quasifree nucleons at Ebeam= 70 GeV ( √ s = 11.5 GeV) studying nK, pK S and pK 0 L decay channels of Θ(1540) in four different final states of the ΘK̄ system. In order to(More)
M. Mattson, G. Alkhazov, A.G. Atamantchouk, M.Y. Balatz, N.F. Bondar, P.S. Cooper, L.J. Dauwe, G.V. Davidenko, U. Dersch, A.G. Dolgolenko, G.B. Dzyubenko, R. Edelstein, L. Emediato, A.M.F. Endler, J. Engelfried, I. Eschrich, C.O. Escobar, A.V. Evdokimov, I.S. Filimonov, F.G. Garcia, M. Gaspero, I. Giller, V.L. Golovtsov, P. Gouffon, E. Gülmez, He Kangling,(More)
The SELEX experiment (Fermilab E781) is a 3-stage magnetic spectrometer for the study of charm hadroproduction at large xF using 600GeV/c Σ , π, and p beams. New precise measurements of the Λc, D , and Ds lifetimes are presented. Results on Λc and Ds production for xF > 0.2 are reported as well. The spectrometer was also used for hyperon physics, where we(More)
J. Russ, N. Akchurin, V. A. Andreev, A.G. Atamantchouk, M. Aykac, M.Y. Balatz, N.F. Bondar, A. Bravar, M. Chensheng, P.S. Cooper, L.J. Dauwe, G.V. Davidenko, U. Dersch, A.G. Dolgolenko, D. Dreossi, G.B. Dzyubenko, R. Edelstein, A.M.F. Endler, J. Engelfried, C. Escobar, I. Eschrich, A.V. Evdokimov, T. Ferbel, I.S. Filimonov, F. Garcia , M. Gaspero, S.(More)
We report the first observation of the Cabibbo-suppressed charm baryon decay Ξ_{c}^{+}→pK^{-}π^{+}. We observe 150±22±5 events for the signal. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 GeV/c Σ^{-} beam. The branching fractions of the decay relative to the Cabibbo-favored(More)
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