Leptons from heavy-quark semileptonic decay in pA collisions within the CGC framework
| Autor: | Fujii, Hirotsugu, Watanabe, Kazuhiro |
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| Rok vydání: | 2015 |
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| Zdroj: | Nucl.Phys.A951 (2016) 45-59; Erratum: Nucl.Phys.A961 (2017) 218-221 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.nuclphysa.2016.03.045 |
| Popis: | We study single lepton production from semileptonic decays of heavy flavor hadrons ($D,B\rightarrow~l$) in pp and p$A$ collisions at RHIC and the LHC within the saturation/Color-Glass-Condensate (CGC) framework. Using the gluon distribution function obtained with the dipole amplitude, whose energy dependence is described by the Balitsky-Kovchegov equation with running coupling effect, we compute the transverse-momentum ($p_\perp$) spectra of the lepton yields at mid and forward rapidities. We find that a large fraction of leptons at low $p_\perp$ stems from the saturation regime of the incoming gluons in the target, especially in p$A$ collisions at the LHC. The resultant $p_\perp$ spectra is slightly harder than the data, but the nuclear modification factor seems consistent with the data within some uncertainty. We also update the nuclear modification factors for J/$\psi$ and $D$ meson at the LHC energy. Comment: 19 pages, 11 figures; v2 Figure 5 replaced; v3 Figures 3,4,5,6,7,8,9 replaced; v4 typo in (1) corrected |
| Databáze: | arXiv |
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