Directed flow and particle production in Au+Au collisions from experiment E877 at the AGS Jean Barrette Foster Radiation Laboratory, McGill Univ., Montreal, Canada H3A 2B2 For the E877 Collaboration: J. Barrette4, R. Bellwied', S. Bennett', R. Bersch7, P. Bra~n-Munzinger~, W.C. Chang7, W.E. Cleland5, M. Clemen', J.D. Cole3, T.M. Corder', Y. Dai4, G. David', J. Dee7, 0. Dietzsch', M.W. Drigert3, J.R. Hall', T.K. Hemmick7, N. Herrmann2, B. Hong7, S. Johnson7, Y. Kwon7, R. Lacasse4, Q Li', T.W. Ludlam', A. Lukaszew', S.K. Mark4, S. McCorkle', R. Matheus', D. Mi6kowiec7, J.T. Murgatroyd', E. O'Brienl, S. Panitkin7, T. Piazza7, M. Pollack7, C. Pruneau', M.N. Rao7, M. Rosati4, N.C. da Silva6, S. Sedykh', U. Sonnadara5, J. Stache17, N. Starinsky4, E.M. Takagui7, S. Voloshin5, T. Vongpaseuth7, G. Wang4, J.P. Wessels7, C.L. Woody', N. Xu7, Y. Zhang7, C. Z0u7 'BNL - 2GSI - 31daho Nat. Eng. Lab. - 4McGill Univ. - 5U~v. of Pittsburgh - 'Univ. de Sib Paul0 - 7SUNY, Stony Brook - 'Wayne State Univ. 1. INTRODUCTION In this article we summarize recent results on the study of Au+Au collisions at 10.8A GeV/c obtained at the AGS by the E877 Collaboration. New results on the directed sideward flow are presented. In particular, the dependence of proton and pion production on the direction of the reaction plane will be discussed. It is shown that the sideward flow is mainly due to nucleons and that pions show little flow effects. Two-pion correlation functions are studied to derive the density at freeze-out. Further, we inspect the correla- tions as a function of the pion direction relative to the reaction plane. A dependence of the deduced source sizes on the pair direction and momentum is observed. The measured source sizes are compared to results obtained in lighter systems. Measured mt spectra of pions and kaons are also presented. The pion spectra show an enhancement at low mt similar to that observed in Si+Pb and which was attributed to A resonance excitation. However, in contrast to Si+Pb now a clear difference between the T+ and 7r- spectra is seen. The K+ spectra, which showed a very steep component over a small pi range in the previously studied Si+Pb reaction [l] exhibit for Au+Au an unexpected structure at very low pt. 14'setup which has been pre- viously described (see e.g. [2, 31 re two calorimeters providing The E877 experimental DISTRIBVTION DF Tbi18 &XU!,ENv 1s..UNLM~ & ~ - -~