Search for the Charmless Decays B = pPx and pPmx

C. Bebek, ' K. Berkelman, ' E. Blucher, ' J. Byrd ' D. G. Cassel, ' E. Cheu, ' D. M. CoA'man, ' T. Copie, ' G. Crawford, ' R. DeSalvo, ' J. W. DeWire, ' P. Drell, ' R. Ehrlich, ' R. S. Galik, ' B. Gittelman, t'~ S. W. Gray, '~ A. M. Hailing, 't D. L. Hartill, t'~ B. K. Heltsley, t'~ J. Kandaswamy, ' R. Kowalewski, ' D. L. Kreinick, ' Y. Kubota, ' J. D. Lewis, ' N. B. Mistry, ' J. Mueller, ' R. Namjoshi, ' S. Nandi, ' E. Nordberg, ' C. O' Grady, ' D. Perticone, ' D. Peterson, ' M. Pisharody, ' D. Riley, ' M. Sapper, ' A. Silverman, ' S. Stone, ' H. Worden, ' M. Worris, ' A. J. Sado', P. Avery, D. Besson, L. Garren, J. Yelton, T. Bowcock, K. Kinoshita, F. M. Pipkin, M. Procario, Richard Wilson, J. Wolinski, D. Xiao, A. Jawahery, C. H. Park, R. Poling, R. Fulton, P. Haas, M. Hempstead, T. Jensen, D. R. Johnson, H. Kagan, R. Kass, F. Morrow, J. Whitmore, P. Baringer, R. L. McIlwain, D. H. Miller, R. Ng, E. I. Shibata, M. S. Alam, D. Chen, N. Katayama, I. J. Kim, W. C. Li, X. C. Lou, C. R. Sun, V. Tanikella, D. Bortoletto, ' M. Goldberg, ' R. Holmes, ' N. Horwitz, ' P. Lubrano, ' M. D. Mestayer, ' G. C. Moneti, ' V. Sharma, ' I. P. J. Shipsey, ' T. Skwarnicki, ' S. E. Csorna, '' T. Letson, " I. C. Brock, ' T. Ferguson, ' and H. Vogel ' ' Cornell University, Ithaca, New York 14853 1thaca College, Ithaca, New York 14850 ' University of Florida, Gainesville, Florida 326II Harvard University, Cambridge, Massachusetts 02138 t ~University of Maryland, College Park, Maryland, 20742 University of Minnesota, Minneapolis, Minnesota 55455 Ohio State University, Columbus, Ohio, 43210 Purdue University, West Lafayette, Indiana, 47907 'State University of New York at Albany, Albany, New York I2222 ' Syracuse University, Syracuse, New York 13210 " Vanderbilt University, Nashville, Tennessee 37235 Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (Received 3 October 1988)