Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-01-22
Phys.Lett.B639:441-446,2006
Physics
Nuclear Physics
Nuclear Experiment
7 pages, 6 figures; improve figures (Fig.4,Fig.6) and text; accepted for publication in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2006.07.008
We propose a sensitive measurement of the charm total cross-section at RHIC through muon identification from charm semileptonic decay at low transverse momentum ($p_T$). This can test the binary-collision scaling ($N_{bin}$) properties of the charm total cross-section and be used to study whether heavy-flavor quarks, which are used as a probe, are produced exclusively at the initial impact in hadron-hadron collisions. The effect of the charm semileptonic decay form factor on extracting the total charm cross section and on the shape of the lepton spectra are also discussed in detail. We conclude that lepton spectra from charmed hadron decays at transverse momentum $p_T\simeq1.0$ GeV/$c$ are sensitive to the charmed hadron spectrum shape. Therefore, the interactions of heavy quarks with the medium created in relativistic heavy-ion collisions, especially the flow effects, can be extracted from the lepton spectra from charmed hadron decays at low $p_T$.
Liu Haidong
Xu Zhangbu
Zhang Yi-fei
Zhong Chen
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