First Charm Hadroproduction Results from SELEX

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,F. Garcia,M. Gaspero,S. Gerzon,I. Giller,G. Ginther,V. L. Golovtsov,Y. M. Goncharenko, E. Gottschalk,P. Gouffon, O. A. Grachov,E. Gulmez,C. Hammer,M. Iori, S. Y. Jun,A. D. Kamenski,H. Kangling, M. Kaya,C. Kenney,J. Kilmer, V. T. Kim,L. M. Kochenda,K. Konigsmann,I. Konorov,A. A. Kozhevnikov,A. G. Krivshich,H. Kruger,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,M. Luksys,T. Lungov,D. Magarrel, V. P. Maleev,D. Mao,S. Masciocchi,P. Mathew,M. Mattson,V. Matveev, E. McCliment,S. L. McKenna,M. A. Moinester,V. V. Molchanov,A. Morelos,V. A. Mukhin,K. Nelson,A. V. Nemitkin,P. V. Neoustroev, C. Newsom,A. P. Nilov,S. B. Nurushev,A. Ocherashvili,G. Oleynik, Y. Onel,E. Ozel, S. Ozkorucuklu,S. Parker,S. Patrichev, A. Penzo,P. Pogodin, B. Povh,M. Procario,V. A. Prutskoi, E. Ramberg,G. F. Rappazzo,B. V. Razmyslovich,V. Rud,P. Schiavon,V. K. Semyatchkin,Z. Shuchen,J. Simon,A. I. Sitnikov,D. Skow, P. Slattery, 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,Z. Wenheng,J. You,L. Yunshan,M. Zhenlin,L. Zhigang,M. Zielinski,R. Zukanovich Funchal,Ramat Aviv

msra（1998）

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摘要

The SELEX experiment (E781) at Fermilab is a 3-stage magnetic spectrometer for the high statistics study of charm hadroproduction out to large x_F using 600 GeV Sigma^-, p and pi beams. The main features of the spectrometer are: high precision silicon vertex system, broad-coverage particle identification with TRD and RICH, 3-stage lead glass photon detector. Preliminary results on differences in hadroproduction characteristics of charm mesons and Lambda_c^+ for x_F>0.3 are reported. For baryon beams there is a striking asymmetry in the production of baryons compared to antibaryons. Leading particle effects for all incident hadrons are discussed.

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