2011 QCD and High Energy Interactions - Rencontres de Moriond ...

q T
1/R AA
1.6
1.4
1.2
1
0.8
LO Fragmentation Contribution
√ ⎯ S = 5.5 TeV, CTEQ6.6M , no Isolation
|y Q, |, |y γ |12 GeV
R = 1000, ω c =50 GeV
γ+b
γ+c
20 40 60
q T
Figure 4: a) The ratio of the LO vacuum fragmentation contribution to the medium fragmentation contribution
for γ + c (black line) and γ + b (red line) production.
4 Conclusion
Prompt photon + heavy-quark jet production has proven to be an extremely useful and versatile
process. It can can be employed to constrain the heavy quark PDFs in hadron-hadron collisions,
while measurements in p − A collisions can help constrain the gluon nPDF.
In heavy-ion collisions it can help estimate the quenching experienced by a heavy jet, while
also providing access to the mass hierarchy of parton energy loss.
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