Open charm and beauty production will have significant cross sections in the RHIC operating range.
PYTHIA calculations indicate 
and 
at 
. Additionally, the parton-level asymmetry is expected to be large
for 
[37]. This strongly suggests that the inclusive high-
single muon
spectrum or
coincidences could be used to measure an integral value of 
with high
statistical precision. Figure 12 shows the number of inclusive single muons detected by the
muon end caps for
,
compared to the pion decay background. Using the values of the
asymmetry for charm and beauty decay averaged over the end cap acceptance for 
yields
. With 
counts this would yield a very significant measurement of
at 
.
Figure 12: Production of single muons from charm, beauty, and pion decay into
the PHENIX end caps at 
versus 
.
Straight lines have been drawn through the charm and beauty decay
distributions to aid in the clarity of the presentation.