Small Angle J/{psi} Production in p{ovr p} Collisions at {radical} (s) =1.8 TeV

This paper presents the first measurement of inclusive J/{psi} production cross section in the forward pseudorapidity region 2.5{le}{vert_bar}{eta}thinsp{sup J/{psi}}{vert_bar}{le}3.7 in p{ovr p} collisions at {radical} (s) =1.8 thinspthinspTeV. The results are based on 9.8 pb{sup {minus}1} of data collected using the D0 detector at the Fermilab Tevatron Collider. The inclusive J/{psi} cross section for transverse momenta between 1 and 16 GeV/c is compared with theoretical models of charmonium production. {copyright} {ital 1998} {ital The American Physical Society }