HADROPRODUCTION OF CHARMONIUM AT LARGE X(F)

We present a higher-twist production mechanism for eta(c) and chi(J) c harmonium at large momentum fraction x(F) in pion-nucleon collisions. The higher-twist contribution is essentially independent of x(F) and t herefore becomes dominant at large x(F), where the leading-twist contr ibution falls off as (1-x(F))(3). We show that the higher-twist mechan ism produces longitudinally polarized chi(1) and chi(2). For the chi(2 ), this is clearly different from the leading-twist prediction of tran sverse polarization. For the chi(1), the polarization of the leading- and higher-twist contributions is qualitatively similar.