Recent results from Selex

The SELEX experiment (E781) is a 3-stage magnetic spectrometer for a high statistics study of hadroproduction of charm baryons out to large xF using 650 GeV Σ,π and p beams. The main features of the spectrometer are: a high precision silicon vertex system; powerful particle identification provided by TRD and RICH; forward Λs decay spectrometer; and 3-stage lead glass photon detector. Preliminary results on asymmetry for Λc produced by Σ , π and p beams at xF > 0.2 and precise measurements of the Λc, D , and preliminary Ds lifetimes are presented. † M. Iori, 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. Escobar, A.V. Evdokimov, I.S. Filimonov, F.G. Garcia, M. Gaspero, I. Giller, V.L. Golovtsov, P. Gouffon, E. Gülmez, S.Y. Jun, H. Kangling, M. Kaya, J. Kilmer, V.T. Kim, L.M. Kochenda, I. Konorov, A.A. Kozhevnikov, A.G. Krivshich, H. Krüger, M.A. Kubantsev, V.P. Kubarovsky, A.I. Kulyavtsev, N.P. Kuropatkin, V.F. Kurshetsov, A. Kushnirenko, S. Kwan, J. Lach, A. Lamberto, L.G. Landsberg, I. Larin, E.M. Leikin, Li Yunshan,7 M. Luksys, T. Lungov, V.P. Maleev, D. Mao, Mao Chensheng, Mao Zhelin, P. Mathew, M. Mattson, V. Matveev, E. McCliment, M.A. Moinester, V.V. Molchanov, A. Morelos, K.D. Nelson, A.V. Nemitkin, P.V. Neoustroev, C. Newsom, A.P. Nilov, S.B. Nurushev, A. Ocherashvili, Y. Onel, E. Ozel, S. Ozkorucuklu, A. Penzo, S.I. Petrenko, P. Pogodin, M. Procario, V.A. Prutskoi, E. Ramberg, G.F. Rappazzo, B. V. Razmyslovich, V.I. Rud, J. Russ, P. Schiavon, J. Simon, A.I. Sitnikov, D. Skow, V.J. Smith, M. Srivastava, V. Steiner, V. Stepanov, L. Stutte, M. Svoiski, N.K. Terentyev, G.P. Thomas, L.N. Uvarov, A.N. Vasiliev, D.V. Vavilov, V.S. Verebryusov, V.A. Victorov, V.E. Vishnyakov, A.A. Vorobyov, K. Vorwalter, J. You, Zhao Wenheng, Zheng Shuchen, and R. Zukanovich Funchal, Ball State University, Muncie, Indiana 47306 Bogazici University, Bebek 80815 Istanbul, Turkey Carnegie–Mellon University, Pittsburgh, Pittsburgh 15213 Centro Brasileiro de Pesquisas F́ısicas, Rio de Janeiro, Brazil Fermi National Accelerator Laboratory, Batavia, Illinois 60510 Institute for High Energy Physics, Protvino, Russia Institute of High Energy Physics, Beijing, PR China Institute of