Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-11-22
Phys.Lett.B637:362-366,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages RevTex, 4 eps-figures, asci-file containing numerical tables of results included
Scientific paper
10.1016/j.physletb.2005.12.073
In nucleus-nucleus collisions, high-pt electron spectra depend on the medium modified fragmentation of their massive quark parents, thus giving novel access to the predicted mass hierarchy of parton energy loss. Here we calculate these spectra in a model, which supplements the perturbative QCD factorization formalism with parton energy loss. In general, we find - within large errors - rough agreement between theory and data on the single inclusive electron spectrum in pp, its nuclear modification factor, and its azimuthal anisotropy. However, the nuclear modification factor depends on the relative contribution of charm and bottom production, which we find to be affected by large perturbative uncertainties. In order for electron measurements to provide a significantly more stringent test of the expected mass hierarchy, one must then disentangle the b- and c-decay contributions, for instance by reconstructing the displaced decay vertices.
Armesto Nestor
Cacciari Matteo
Dainese Andrea
Salgado Carlos A.
Wiedemann Urs Achim
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