“…Exclusive e þ e À cross sections for hadronic final states containing charm mesons in the ffiffi ffi s p ¼ 3:7-5 GeV=c 2 energy range were measured by BABAR (Aubert et al, 2007e, 2009b and Belle (Pakhlova et al, 2007(Pakhlova et al, , 2008a(Pakhlova et al, , 2008b(Pakhlova et al, , 2008c(Pakhlova et al, , 2009) using ISR to reach the charmonium region. Note that in these analyses Belle systematically employed a partial reconstruction technique to increase the detection efficiency and suppress background.…”