We calculate the semi-inclusive processes B →Xsηc and
relate it to B →Xsψ in next to leading order QCD, and show
how it can be used to determine an accurate value of fηc. The
exclusive modes B → Kηc and B → Kψ also
yield similar results, whereas B → K∗ηc and B →
K∗ψ can provide valuable information on hadronic form factors. We also
estimate the branching ratios and the ratios of exclusive to inclusive decay
modes dominated by b \rightarrow s\e.Comment: 12 pages LATEX, (used new data on B decays, give determination of
fηc and more models